Allianz Life Insurance Co Of North America POS AM 17 Apr 18 Prospectus update (post-effective amendment) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017
Document Information [Line Items]
Document Type	S1
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Entity Registrant Name	ALLIANZ LIFE INSURANCE CO OF NORTH AMERICA
Entity Central Index Key	72,499
Entity Filer Category	Non-accelerated Filer

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Investments:
Available-for-sale, at fair value		$ 98,805,288	$ 87,546,971
Trading at Fair Value		36,219	37,051
Held to maturity, at amortized cost			28
Mortgage loans on real estate		11,761,939	10,351,741
Derivative assets		1,388,190	1,059,031
Loans to affiliates		39,120	39,120
Policy loans		184,409	171,012
Equity securities:
Available-for-sale, at fair value		271,909	320,166
Fair value option and trading, at fair value		314,370	317,493
Other invested assets		382,154	357,210
Total investments		113,183,598	100,199,823
Cash and cash equivalents		1,507,360	1,219,984
Accrued investment income		1,096,862	1,095,038
Receivables		410,296	566,088
Reinsurance and investment contract recoverables		5,295,486	4,687,918
Deferred acquisition costs		3,850,840	5,246,343
Net deferred tax asset		0	388,009
Collateral held from securities lending agreements		2,657,046	2,561,219
Other assets		1,988,685	1,891,717
Assets, exclusive of separate account assets		129,990,173	117,856,139
Separate account assets		28,192,877	27,733,261
Total assets		158,183,050	145,589,400
Policyholder liabilities:
Account balances and future policy benefit reserves		115,774,156	105,354,460
Policy and contract claims		696,697	620,743
Unearned premiums		98,272	145,335
Other policyholder funds		268,649	275,262
Total policyholder liabilities		116,837,774	106,395,800
Derivative liabilities		915,147	635,634
Mortgage notes payable		68,628	76,916
Net deferred tax liability		176,416	0
Other liabilities		4,032,502	3,673,122
Liabilities, exclusive of separate account liabilities		122,030,467	110,781,472
Separate account liabilities	[1]	28,192,877	27,733,261
Total liabilities		150,223,344	138,514,733
Stockholder's equity:
Common stock		20,000	20,000
Additional paid-in capital		4,053,371	4,053,371
Retained earnings		1,763,078	1,829,115
Accumulated other comprehensive income, net of tax		2,104,354	1,153,278
Total stockholder's equity		7,959,706	7,074,667
Total liabilities and stockholder's equity		158,183,050	145,589,400
Class A, Series A preferred stock
Stockholder's equity:
Preferred stock, value		8,909	8,909
Class A, Series B preferred stock
Stockholder's equity:
Preferred stock, value		$ 9,994	$ 9,994
[1]	The previously issued 2016 Consolidated Financial Statements improperly disclosed COLI and Separate account liabilities as financial instruments measured at fair value on a recurring basis. These financial instruments have been corrected in the above table to conform with current year presentation as they are carried at other than fair value.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized cost of fixed-maturity securities available-for-sale	$ 92,615,161	$ 84,029,645
Trading amortized cost	35,982	36,504
Held to maturity, fair value	0	3,630
Mortgage loans, loan losses	37,000	48,400
Available-for-sale equity, at cost	261,073	316,541
Fair Value Option and Trading at Fair Value	289,217	312,592
Receivables, allowance for uncollectible	4,363	4,959
Account balances and future policy benefit reserves, fair value	$ 5,064,282	$ 2,611,562
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	20,000,001	20,000,001
Common stock, shares outstanding	20,000,001	20,000,001
Class A, Series A preferred stock
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	8,909,195	8,909,195
Preferred stock, shares issued	8,909,195	8,909,195
Preferred stock, shares outstanding	8,909,195	8,909,195
Preferred stock, liquidation preference	$ 1,779	$ 2,084
Class A, Series B preferred stock
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	9,994,289	9,994,289
Preferred stock, shares outstanding	9,994,289	9,994,289
Preferred stock, liquidation preference	$ 4,060	$ 4,283

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Premiums and policy fees, net	$ 1,605,227	$ 1,407,279	$ 1,449,591
Interest and similar income, net	4,522,219	4,325,737	4,175,469
Change in fair value of assets and liabilities	3,602,468	(178,238)	(532,720)
Realized investment gains (losses), net	83,622	(49,325)	94,413
Fee and commission revenue	266,602	274,562	293,333
Other revenue	58,128	35,292	10,066
Total revenue	10,138,266	5,815,307	5,490,152
Benefits and expenses:
Policyholder benefits, net of recoveries	361,285	472,611	531,615
Change in fair value of annuity and life embedded derivatives	4,962,770	275,808	588,595
Net interest credited to account values	1,805,184	1,634,759	1,482,884
Net benefits and expenses	7,129,239	2,383,178	2,603,094
Commissions and other agent compensation	1,084,430	1,333,439	1,167,109
General and administrative expenses	727,714	695,949	637,328
Change in deferred acquisition costs, net	274,363	259,407	239,259
Total benefits and expenses	9,215,746	4,671,973	4,646,790
Income (loss) from operations before income taxes	922,520	1,143,334	843,362
Income tax expense	208,557	355,156	243,066
Net income	713,963	788,178	600,296
Realized investment gains (losses), net:
Total credit-related other-than-temporary impairment losses on securities	(48,574)	(174,823)	(58,975)
Other net realized gains	132,196	125,498	153,388
Net realized investment gains (losses)	$ 83,622	$ (49,325)	$ 94,413

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 713,963	$ 788,178	$ 600,296
Net unrealized gain (loss) on investments, net of shadow adjustments and deferred taxes	958,313	693,289	(1,293,230)
Net (loss) gain on cash flow hedging instruments	(8,090)	(29,614)	8,933
Unrealized (loss) gain on postretirement obligation, net of tax	(4)	(39)	111
Foreign currency translation adjustments, net of tax	857	692	(4,009)
Total other comprehensive income (loss)	951,076	664,328	(1,288,195)
Total comprehensive income	$ 1,665,039	$ 1,452,506	$ (687,899)

Consolidated Statements of Stoc

Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income
Beginning balance at Dec. 31, 2014	$ 7,776,350	$ 18,903	$ 20,000	$ 4,053,371	$ 1,906,931	$ 1,777,145
Comprehensive income:
Net income	600,296				600,296
Net unrealized gain on investments, net of shadow adjustments and deferred taxes	(1,293,230)					(1,293,230)
Net gain on cash flow hedging instruments	8,933					8,933
Net unrealized gain on postretirement obligation, net of deferred taxes	111					111
Foreign currency translation adjustment, net of deferred taxes	(4,009)					(4,009)
Total comprehensive income	(687,899)
Dividend to parent	(572,125)				(572,125)
Ending balance at Dec. 31, 2015	6,516,326	18,903	20,000	4,053,371	1,935,102	488,950
Comprehensive income:
Net income	788,178				788,178
Net unrealized gain on investments, net of shadow adjustments and deferred taxes	693,289					693,289
Net gain on cash flow hedging instruments	(29,614)					(29,614)
Net unrealized gain on postretirement obligation, net of deferred taxes	(39)					(39)
Foreign currency translation adjustment, net of deferred taxes	692					692
Total comprehensive income	1,452,506
Dividend to parent	(894,165)				(894,165)
Ending balance at Dec. 31, 2016	7,074,667	18,903	20,000	4,053,371	1,829,115	1,153,278
Comprehensive income:
Net income	713,963				713,963
Net unrealized gain on investments, net of shadow adjustments and deferred taxes	958,313					958,313
Net gain on cash flow hedging instruments	(8,090)					(8,090)
Net unrealized gain on postretirement obligation, net of deferred taxes	(4)					(4)
Foreign currency translation adjustment, net of deferred taxes	857					857
Total comprehensive income	1,665,039
Dividend to parent	(780,000)				(780,000)
Ending balance at Dec. 31, 2017	$ 7,959,706	$ 18,903	$ 20,000	$ 4,053,371	$ 1,763,078	$ 2,104,354

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows provided by operating activities:
Net income	$ 713,963	$ 788,178	$ 600,296
Adjustments to reconcile net income to net cash provided by operating activities:
Realized investment gains (losses), net	(85,171)	47,558	(80,225)
Purchase of trading fixed-maturity securities	(10,207)	(150)	(4,819)
Sale, maturity, and other redemptions of trading fixed-maturity securities	10,702	0	8,700
Purchase of fair value option and trading equity securities	(742,825)	(1,371,832)	(497,657)
Sale and other redemptions of fair value option and trading equity securities	774,632	1,355,529	503,912
Change in annuity-related options, derivatives, and gross reserves	4,360,198	172,780	109,763
Deferred income tax expense (benefit)	125,443	(202,860)	(307,986)
Charges to policy account balances	(274,975)	(222,131)	(187,637)
Gross interest credited to account balances	2,016,226	1,760,900	1,618,376
Amortization, depreciation, and change in fair value	(21,880)	115,328	60,857
Change in:
Accrued investment income	(1,824)	(51,730)	(124,230)
Receivables	155,792	(164,182)	(251,059)
Reinsurance and investment contract recoverables	(607,568)	(254,419)	(227,639)
Deferred acquisition costs	274,363	259,407	239,259
Future policy benefit reserves	26,260	328,295	1,218,582
Policy and contract claims	75,954	102,818	74,481
Other policyholder funds	(6,613)	(20,960)	(35,142)
Unearned premiums	(11,388)	21,540	(20,157)
Other assets and liabilities	14,587	(19,822)	(278,427)
Other, net	(1,045)	420	(5,924)
Net cash provided by operating activities	6,784,624	2,644,667	2,413,324
Cash flows used in investing activities:
Purchase of available-for-sale fixed-maturity securities	(16,212,518)	(14,962,344)	(15,028,477)
Sale and other redemptions of available-for-sale and held-to-maturity fixed-maturity securities	6,469,905	8,405,110	7,224,211
Matured available-for-sale and held-to-maturity fixed-maturity securities	1,512,015	1,585,456	1,767,133
Funding of mortgage loans on real estate	(2,292,432)	(2,249,020)	(2,281,527)
Repayment/disposal of mortgage loans on real estate	893,634	674,296	673,278
Purchase of derivative securities	(202,269)	(423,397)	(512,523)
Sale of derivative securities	1,206,462	415,794	242,298
Purchase of available-for-sale equity securities	(77,209)	(376,145)	(143,684)
Sale of available-for-sale equity securities	136,911	152,821	58,858
Purchase of interest in equity method investments	(116,542)	(53,952)	(19,777)
Sale of real estate	0	0	5,929
Net change in short-term securities	(196,672)	4,454	43,443
Purchase of home office property and equipment	(1,040)	(1,794)	(7,486)
Goodwill and intangible acquisition	0	(7,801)	0
Other, net	7,238	(7,636)	(2,958)
Net cash used in investing activities	(8,872,517)	(6,926,348)	(7,144,829)
Cash flows provided by financing activities:
Cash (paid to) received from FHLB advance	0	(500,000)	500,000
Policyholders' deposits to account balances	10,426,708	12,299,879	10,035,234
Policyholders' withdrawals from account balances	(7,113,663)	(6,601,844)	(6,485,558)
Policyholders' net transfers between account balances	(119,732)	56,943	101,897
Change in amounts drawn in excess of bank balances	(29,756)	(11,650)	16,045
Dividend paid to parent company	(780,000)	(861,000)	(572,125)
Repayment of mortgage notes payable	(8,288)	(7,845)	(7,423)
Net cash provided by financing activities	2,375,269	4,374,483	3,588,070
Net change in cash and cash equivalents	287,376	92,802	(1,143,435)
Cash and cash equivalents at beginning of year	1,219,984	1,127,182	2,270,617
Cash and cash equivalents at end of year	1,507,360	1,219,984	1,127,182
Note: Supplemental disclosure of cash flow information for noncash transactions - non-cash dividend payment
Supplemental disclosure of cash flow information for non-cash distribution - non-cash dividend payment to affiliate (see note 19 for further discussion)	0	(33,165)	0
Affiliates
Cash flows used in investing activities:
Change in loan to related parties	0	(39,115)	817,110
Non Affiliates
Cash flows used in investing activities:
Change in loan to related parties	$ 0	$ (43,075)	$ 19,343

Organization

Organization	12 Months Ended
	Dec. 31, 2017
Organization	(1) Organization Allianz Life Insurance Company of North America (the Company) is a wholly-owned subsidiary of Allianz of America, Inc. (AZOA or parent company), which is a wholly-owned subsidiary of Allianz Europe, B.V. Allianz Europe, B.V. is a wholly-owned subsidiary of Allianz SE. Allianz SE is a European company registered in Munich, Germany, and is the Company’s ultimate parent. The Company is a life insurance company licensed to sell annuity, group and individual life, and group and individual accident and health policies in the United States, Canada, and several U.S. territories. Based on statutory net premium written, the Company's business is predominately annuity. The annuity business consists of fixed-indexed, variable, variable-indexed, and fixed annuities. The life business consists of both individual and group life. Life business includes products with guaranteed premiums and benefits and consists principally of universal life policies, fixed-indexed universal life policies, term insurance policies, and limited payment contracts. Accident and health business is primarily comprised of closed blocks of long-term care (LTC) insurance. The Company’s primary distribution channels are through independent agents, broker-dealers, banks, and third-party marketing organizations.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Summary of Significant Accounting Policies	(2) Summary of Significant Accounting Policies (a) Basis of Presentation The Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The accounts of the Company’s primary subsidiary, Allianz Life Insurance Company of New York (AZNY), and all other subsidiaries have been consolidated. All intercompany balances and transactions have been eliminated in consolidation. (b) Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect reported amounts of assets and liabilities, including reporting or disclosure of contingent assets and liabilities as of December 31, 2017 and 2016 , and the reported amounts of revenues and expenses during the reporting period. Future events, including changes in mortality, morbidity, interest rates, capital markets, and asset valuations could cause actual results to differ from the estimates used within the Consolidated Financial Statements. Such changes in estimates are recorded in the period they are determined. (c) Investment Products and Universal Life Business Investment products consist primarily of fixed and variable annuity products. Premium receipts are reported as deposits to the contractholders’ accounts or an establishment of future policy benefit reserves. Premiums and policy fees, net in the Consolidated Statements of Operations represent asset fees, cost of insurance charges, administrative fees, charges for guarantees on investment products, and surrender charges for investment products and universal life insurance, all of which is net of reinsurance. These fees have been earned and assessed against contractholders on a daily or monthly basis throughout the contract period and are recognized as revenue when assessed and earned. Amounts assessed that represent compensation to the Company for services to be provided in future periods are not earned in the period assessed. Such amounts are reported as unearned revenue, which include unearned revenue reserves (URR), and are recognized in operations over the period benefited using the same assumptions and factors used to amortize capitalized acquisition costs. Unearned revenue is reported in Unearned premiums on the Consolidated Balance Sheets. Surrender charges are recognized upon surrender of a contract in accordance with contractual terms. Derivatives embedded in fixed-indexed, variable, and certain life products are recorded at fair value and changes in value are included in Change in fair value of annuity and life embedded derivatives in the Consolidated Statements of Operations. Benefits consist of interest credited to contractholders’ accounts and claims incurred in excess of the contractholders’ account balance, net of reinsurance, and are included in Net interest credited to account values and Policyholder benefits, net of recoveries, respectively, within the Consolidated Statements of Operations. The Company offers a variable-indexed annuity product that combines a separate account option with a general account option that is similar to a fixed-indexed annuity. The Company has elected the fair value option to account for the entire insurance contract liability and the variable investment option assets in the separate account. The insurance contracts’ reserves are reported in Account balances and future policy benefit reserves and the variable investment option assets within the separate account are reported in Equity securities, fair value option and trading on the Consolidated Balance Sheets. Assets backing the general account are primarily reported in Fixed-maturity securities, available-for-sale on the Consolidated Balance Sheets. Electing the fair value option for an insurance contract liability requires that the Company account for that liability as a financial instrument at fair value through profit and loss and also requires that acquisition costs be recognized immediately in expense. See note 6 for further details regarding the valuation methodology of the variable-indexed annuity product. (d) Life and Accident and Health Insurance Premiums on traditional life products are recognized as revenue over the premium-paying periods of the contracts when due from contractholders. Premium revenue generally exceeds expected policy benefits in the early years of the contracts and a reserve liability is established for costs and benefits that are expected to be paid in the later years of the contracts. Accident and health premiums are recognized as earned on a pro rata basis over the risk coverage periods. Benefits and expenses are recognized as incurred. (e) Investments Fixed-Maturity Securities and Equity Securities The Company has portfolios of fixed-maturity securities and equity securities classified as “available-for-sale.” Accordingly, these securities are carried at fair value, and related unrealized gains and losses are credited or charged directly to accumulated other comprehensive income (AOCI) in stockholder’s equity, net of tax and related shadow adjustments. The adjustments to deferred acquisition costs (DAC) , value of business acquired (VOBA), and deferred sale inducements (DSI) represent the change in amortization that would have been required as a charge or credit to operations had such unrealized amounts been realized. The adjustment to reserves represents the increase or decrease in the reserve balance that would have been required as a charge or credit to operations had such unrealized amounts been realized. Included in the Company’s portfolios of fixed-maturity securities classified as “available-for-sale” are fixed-maturity securities acquired with deteriorated credit quality. On a quarterly basis, the Company estimates the future cash flows for these securities and records any changes as adjustments to accretable yield. Accretable yield refers to the amount of undiscounted cash flows expected in excess of the carrying amount. This amount is converted into a rate and accreted into Interest and similar income, net in the Consolidated Statements of Operations. Interest is recorded as received on certain securities acquired that do not have reasonably estimable cash flows. If, subsequently, it is probable that there is a significant change in cash flows expected to be collected or if actual cash flows are significantly greater than cash flows previously expected to be collected, the effective yield is recalculated prospectively. The Company has portfolios of certain fixed-maturity securities and equity securities classified as “trading”. These securities are carried at fair value, and related unrealized and realized gains and losses are reflected in Change in fair value of assets and liabilities within the Consolidated Statements of Operations. Additionally, the Company has a portfolio of mutual fund seed money investments and restricted stock units (RSU) for which the fair value option was elected and is included within Equity securities, fair value option and trading on the Consolidated Balance Sheets. The fair value option was elected for the mutual fund seed money investments because the portfolio is managed based on the fair values and ultimately sold to other investors at fair value. For RSU, the fair value option was elected as RSU are tied to the share price of Allianz SE stock, which constitutes a fair value, and more accurately reflects the underlying obligation owed to certain employees. In addition, the Company had portfolios of certain fixed-maturity securities classified as “held-to-maturity” carried at amortized cost on the Consolidated Balance Sheets as of December 31, 2016. During 2017, the Company sold one portfolio of held-to-maturity fixed-maturity securities for which the Company had collected a substantial portion of the principal outstanding and the remaining portfolio of held-to-maturity fixed-maturities matured. Dividends are accrued on the date they are declared and interest is accrued as earned. Premiums or discounts on fixed-maturity securities are amortized using the constant yield method. Realized gains and losses are computed based on the average amortized cost basis of all lots owned of each security. The Company has portfolios of structured securities which include mortgage-backed securities, collateralized debt obligations (CDO), collateralized loan obligations (CLO), and other asset-backed securities. Mortgage-backed securities and CDO are presented separately while CLO and other asset-backed securities are included within 'Corporate securities' within the Notes to the Consolidated Financial Statements. Structured securities are amortized using, among other assumptions, anticipated prepayments. Prepayment assumptions for structured securities are obtained from various external sources or internal estimates. The Company believes these assumptions are consistent with those a market participant would use. The Company recognizes income using a constant effective yield method based on prepayment assumptions and the estimated economic life of the securities. For all structured securities without expected credit deterioration, when actual prepayments differ significantly from anticipated prepayments, the effective yield is recalculated to reflect actual payments to date and anticipated future payments retrospectively. Any resulting adjustment is included in Interest and similar income, net in the Consolidated Statements of Operations. For structured securities with expected credit deterioration, when adjustments are made to assumptions for prepayments and other future cash flows, the effective yield is recalculated prospectively. The fair value of fixed-maturity securities and equity securities is obtained from third-party pricing sources whenever possible. Management completes its own independent price verification (IPV) process, which ensures security pricing is obtained from a third-party source other than the sources used by the Company's internal and external investment managers. The IPV process supports the reasonableness of price overrides and challenges by the internal and external investment managers and reviews pricing for appropriateness. Results of the IPV process are reviewed by the Company’s Pricing Committee. The Company reviews the available-for-sale and held-to-maturity fixed-maturity investment portfolios to determine whether or not declines in fair value are other-than-temporary. In addition, the Company continually evaluates average amortized cost, fair value, credit quality, extent and duration of the decline, market analysis, current events, recent price declines, changes in risk-free interest rates, and likelihood of recovery in a reasonable period of time. Based on this evaluation, the Company determines whether fixed-income securities are considered other-than-temporarily impaired. When the fair value of a fixed-maturity security is less than its amortized cost, the Company assesses whether or not (i) it has the intent to sell the security or (ii) it is more likely than not that the Company will be required to sell the security before its anticipated recovery. The Company evaluates these factors to determine whether the Company or any of its internal and external investment managers have the intent to sell a security or a group of securities. The Company performs a cash flow projection for several years into the future to determine whether cash needs would require the sale of any securities in an unrealized loss position. If either of these conditions are met, the Company must recognize an other-than-temporary impairment (OTTI) for the difference between the investment’s amortized cost basis and its fair value through earnings. For securities that do not meet the above criteria and the Company does not expect to recover a security’s amortized cost basis, the security is also considered other-than-temporarily impaired. For these securities, the Company separates the total impairment into the credit loss component and the amount of the loss related to other factors. The amount of the total impairment related to credit loss is considered an OTTI and is recognized in Realized investment gains (losses), net in the Consolidated Statements of Operations. The amount of the total impairment related to other factors is recognized in other comprehensive income (OCI), net of impacts to DAC, DSI, VOBA, reserves, and deferred income taxes. For available-for-sale and held-to-maturity securities that have recognized an OTTI through earnings, if through subsequent evaluation there is a significant increase in the cash flow expected, the difference between the amortized cost basis and the discounted cash flows expected to be collected is accreted as interest income. Subsequent increases and decreases not related to additional credit losses in the fair value of available-for-sale securities are included in the Consolidated Statements of Comprehensive Income (Loss). The Company evaluates whether a credit loss exists by considering primarily the following factors: (a) the length of time and extent to which the fair value has been less than the amortized cost of the security; (b) changes in the financial condition, credit rating, and near-term prospects of the issuer; (c) whether the issuer is current on contractually obligated interest and principal payments; (d) changes in the financial condition of the security’s underlying collateral, if any; and (e) the payment structure of the security . The Company uses a probability-weighted cash flow model for fixed-maturity securities to determine the credit loss amount. This measurement is a quantitative and qualitative process that incorporates information received from third-party sources along with certain internal assumptions and significant judgments regarding the future performance of the security. The Company’s probability-weighted cash flow model involves assumptions including, but not limited to, various performance indicators, such as historical and projected default and recovery rates, credit ratings, and current delinquency rates. The Company provides a supplemental disclosure within the Consolidated Statements of Operations that presents the total OTTI losses recognized in earnings during the period. The supplemental disclosure excludes subsequent increases and decrease in the fair value of these securities. The Company evaluates whether equity securities are other-than-temporarily impaired through a review process which includes, but is not limited to, market analysis, analyzing current events, assessing recent price declines, and management’s judgment related to the likelihood of recovery within a reasonable period of time. Impairments in the value of securities held by the Company considered to be other-than-temporary are recorded as a reduction of the cost of the security, and a corresponding realized loss is recognized in the Consolidated Statements of Operations. The Company adjusts DAC , VOBA, and DSI for impairments on securities, as discussed in their respective sections of this note. Mortgage Loans on Real Estate Mortgage loans on real estate are reflected at unpaid principal balances adjusted for an allowance for uncollectible balances. Interest on mortgage loans is accrued on a monthly basis and recorded in Interest and similar income, net in the Consolidated Statements of Operations. The Company analyzes loan impairment quarterly when assessing the adequacy of the allowance for uncollectible balances. The Company considers recent trends in the Company’s loan portfolio and information on current loans, such as loan-to-value ratios and debt service coverage, which could impact a loan’s credit quality. The Company also evaluates the allowance for uncollectible balances to ensure that the estimate is based on appropriate market assumptions to reflect default and loss rates. The Company does not accrue interest on delinquent loans. When the Company discontinues accruing interest on delinquent loans, interest is recorded on a cash basis. The Company will begin accruing interest again on a loan once all delinquent interest and principal payments are brought current. Loans to Affiliates The Company has a note receivable from a related party and has recorded it in Loans to affiliates on the Consolidated Balance Sheets. Loans to affiliate are carried at amortized cost on the Consolidated Balance Sheets and interest is accrued on a monthly basis. Interest payments are received annually. Policy Loans Policy loans are supported by the underlying cash value of the policies. Policy loans are carried at unpaid principal balances plus accrued interest income on the Consolidated Balance Sheets. Other Invested Assets Other invested assets include short-term securities, loans to non-affiliates, equity securities carried at cost, investments in limited partnerships, and investments in limited liability companies. Short-term securities are comprised of fixed-maturity securities with an original maturity of twelve months or less and greater than three months when purchased. Short-term securities are carried at amortized cost, which approximates fair value due to their short-term nature. Loans to non-affiliates are carried at amortized cost, and interest is accrued monthly. The Company invests in low income housing limited partnerships and limited liability companies (LIH investments) for tax benefits. The LIH investments are carried at cost, adjusted for amortization based on the proportion of total tax credits and other tax benefits expected to be received over the life of the investments . The investments in the LIH investments were $63,407 and $46,727 as of December 31, 2017 and 2016 , respectively. The LIH investments are individually evaluated for impairment based on the recoverability of each investment's amortized cost. The Company records a liability and corresponding asset for the discounted future commitment, which decreases as the Company provides capital to fund . The tax benefit is recognized within Income tax expense in the Consolidated Statements of Operations. The Company has recognized tax credits related to the LIH investments of $13,651 , $7,125 , and $2,793 for the years ended December 31, 2017 and 2016 , and 2015 , respectively. Investments in limited partnerships and limited liability companies (other than LIH investments) are accounted for using the equity method of accounting. Undistributed limited partnership and limited liability company profits and losses are recorded in Interest and similar income, net in the Consolidated Statements of Operations. Distributions in excess of cost and impairments of investments in limited partnerships and limited liability companies are recognized within Realized investment gains (losses), net in the Consolidated Statements of Operations. Investments in limited partnerships and limited liability companies are individually evaluated for impairment based upon the recoverability of the each investment's cost. The Company is a member of the Federal Home Loan Bank of Des Moines (FHLB), primarily for the purpose of participating in the FHLB’s mortgage collateralized loan advance program with short-term and long-term funding facilities. Members are required to purchase and hold a minimum amount of FHLB capital stock plus additional stock based on outstanding advances. The equity security investment is carried at cost, which approximates fair value, and is reported in Other invested assets on the Consolidated Balance Sheets. The Company held FHLB stock of $30,000 at December 31, 2017 and 2016 . Advances are in the form of short-term or long-term notes or funding agreements issued to FHLB. Advances received from FHLB are recorded in Account balances and future policy benefit reserves on the Consolidated Balance Sheets. The investment is evaluated for impairment based on the ultimate recoverability of its par value. The Company has a fully collateralized funding agreement with a balance of $500,000 at December 31, 2017 and 2016 . In 2015, the Company obtained a cash advance from FHLB which had a balance of $500,000 as of December 31, 2015. The cash advance was recorded in Other liabilities on the Consolidated Balance Sheets and was subsequently paid off in 2016. Variable Interest Entities In the normal course of business, the Company enters into relationships with various entities that are deemed to be variable interest entities. A variable interest entity (VIE) is an entity that either (1) has equity investors that lack certain essential characteristics of a controlling financial interest (including the ability to control activities of the entity, the obligation to absorb the entity’s expected losses, and the right to receive the entity’s expected residual returns) or (2) lacks sufficient equity to finance its own activities without financial support provided by other entities, which in turn would be expected to absorb at least some of the expected losses of the VIE. The Company consolidates a VIE if it is determined to be the primary beneficiary. Those entities which do not meet the requirements to be a VIE are voting interest entities (VOEs). The Company consolidates a VOE if it holds a voting interest that is greater than 50%. (f) Derivatives The Company utilizes derivatives within certain actively managed investment portfolios. Within these portfolios, derivatives can be used for hedging, replication, and income generation only. The financial instruments are carried at fair value and the unrealized gains and losses are reflected in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Hedge Accounting To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating changes in the cash flows or fair value of the hedged item due to the designated risk hedged. The documentation process involves defining the Company’s risk management objective, strategy for undertaking each hedge transaction, linking specific derivatives to specific assets or liabilities on the Consolidated Balance Sheets, and defining the effectiveness testing methods to be used. The Company also formally assesses, at inception and on a quarterly basis, whether the derivatives used in hedging transactions have been and are expected to continue to be highly effective in offsetting changes in the cash flows or fair value of hedged items based on the designated risk hedged. Hedge effectiveness is assessed on a prospective and retrospective basis using quantitative methods. Since the inception of the hedge accounting program, on both a prospective and retrospective basis, changes in the cash flows or fair value of the hedging instrument are expected to offset the changes in the cash flows of the hedged item as the key terms match for both instruments. The cumulative effective amount of unrealized gains and losses of the hedging instrument is recognized in AOCI, net of tax on the Consolidated Balance Sheets. The ineffective portion of the change in the fair value of the hedging instrument is recognized in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Foreign Currency Swaps The Company utilizes foreign currency swaps to hedge cash flows and applies hedge accounting treatment. Specifically, the Company uses foreign currency swaps to hedge foreign currency and interest rate fluctuations on certain underlying foreign currency denominated fixed-maturity securities. The foreign currency swaps are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets. The fair value of the foreign currency swaps are derived using a third-party vendor software program and deemed by management to be reasonable. Interest income generated from the foreign currency swaps is recorded in Interest and similar income, net in the Consolidated Statements of Operations. The Company has a timing difference between the purchase of the foreign currency swap and settlement of the hedged foreign currency denominated fixed-maturity security. Any changes in value of the foreign currency swap between the purchase and settlement date are recorded in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. After the hedged foreign currency denominated fixed-maturity security is settled, the Company completes documentation and designates hedge accounting. Nonqualifying hedging Futures and Options Contracts The Company provides benefits through certain life and annuity products which are linked to the fluctuation of various market indices, and certain variable annuity contracts that provide minimum guaranteed benefits. The Company has analyzed the characteristics of these benefits and has entered into over-the-counter (OTC) option contracts , exchange-traded option (ETO) contracts , and exchange-traded futures contracts tied to an underlying index with similar characteristics with the objective to economically hedge these benefits. In addition, the Company uses futures contracts to hedge the investment risk associated with seed money. Management monitors in-force amounts and option and futures contract values to ensure satisfactory matching and to identify unsatisfactory mismatches. If actual persistency deviated, management would purchase or sell option and futures contracts as deemed appropriate or take other actions. The OTC option contracts and ETO contracts are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets. The fair value of the OTC options is derived internally and deemed by management to be reasonable via performing an IPV process. The process of deriving internal derivative prices requires the Company to calibrate Monte Carlo scenarios to actual market information. The calibrated scenarios are applied to derivative cash flow models to calculate fair value prices for the derivatives. The fair value of the ETO contacts is based on quoted market prices. Changes in unrealized gains and losses on the OTC option contracts and ETO contracts and incremental gains and losses from expiring contracts are recorded within Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Futures contracts do not require an initial cash outlay, and the Company has agreed to daily net settlement based on movements of the representative index. Therefore, no asset or liability is recorded on the Consolidated Balance Sheets. Gains and/or losses on futures contracts are included in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Interest Rate Swaps, Credit Default Swaps, Total Return Swaps, and To Be Announced Securities The Company utilizes interest rate swaps (IRS), credit default swaps (CDS), total return swaps (TRS), and To Be Announced (TBA) securities , which do not meet the regular-way security trade scope exception , to economically hedge market risks embedded in certain life and annuity products . The IRS, CDS, TRS, and TBA securities are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets . The fair value of the IRS, CDS, and TBA securities are derived using a third-party vendor software program and deemed by management to be reasonable. Centrally cleared IRS fair values are obtained from the exchange on which they are traded. The fair value of the TRS is based on counterparty pricing and deemed by management to be reasonable. The unrealized gains and losses as well as investment income and expenses on these derivatives are recorded in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Stock Appreciation Rights The Company enters into contracts with Allianz SE with the objective to economically hedge risk associated with the Allianz SE stock-based compensation plan, which awards certain employees stock appreciation rights (SAR). The contracts are recorded at fair value within Derivative assets on the Consolidated Balance Sheets. The change in fair value for SAR are recorded in Change in fair value of assets and liabilities and General and administrative expenses within the Consolidated Statements of Operations, respectively. See further discussion of the stock-based compensation plan in note 18. (g) Cash and Cash Equivalents Cash and cash equivalents include cash on hand, demand deposits, short-term government money market funds, overnight commercial paper, overnight reverse repurchase agreements, and highly liquid debt instruments purchased with an original maturity of three months or less. In the normal course of business, the Company enters into overnight bilateral and tri-party reverse repurchase agreements, whereby the Company purchases securities and simultaneously agrees to resell the same securities at a stated price on a specified date in the future, for the purpose of earning a specified rate of return. An affiliate of the Company serves as the agent in the bilateral agreements and an unaffiliated bank serves as the custodian in the tri-party agreements. The bilateral agreements require purchases of specifically identified securities. If at any time the fair value of those purchased securities falls below the purchase price, additional collateral in the form of cash or additional securities is required to be transferred to ensure margin maintenance. The tri-party agreements allow for the purchase of certain bonds and structured securities, and require a minimum of 102% of fair value of the securities purchased to be maintained as collateral. Due to the short-term nature of these investments, the carrying value is deemed to approximate fair value. (h) Securities Lending The Company participates in securities lending arrangements whereby specific securities are loaned to other institutions. The Company receives collateral from these arrangements including cash and cash equivalents, which can be reinvested based on the Company's discretion, and noncash collateral, which may not be sold or re-pledged unless the counterparty is in default. The Company accounts for its securities lending transactions as secured borrowings, in which the cash collateral received and the related obligation to return the cash collateral are recorded on the Consolidated Balance Sheets as Collateral held from securities lending agreements and Other liabilities, respectively. Noncash collateral received is not reflected on the Consolidated Balance Sheets. Securities on loan remain on the Consolidated Balance Sheets as Fixed-maturity securities, available-for-sale, and interest income earned by the Company on loaned securities is recognized in Interest and similar income, net in the Consolidated Statements of Operations. Company policy requires a minimum of 102% of fair value of securities loaned under securities lending agreements to be maintained as collateral. (i) Receivables Receivable balances (contractual amount less allowance for doubtful accounts) are based on pertinent information available to management as of year-end, including the financial condition and creditworthiness of the parties underlying the receivables. Receivable balances are monitored and the allowance for doubtful accounts is maintained based on the nature of the receivables, and the Company’s assessment of the ability to collect . The allowance is estimated by aging the balances due from individual parties and generally setting up an allowance for any balances that are more than 90 days old. (j) Reinsurance The Company assumes and cedes business with other insurers. Reinsurance premium and benefits paid or provided are accounted for in a manner consistent with the basis used in accounting for original policies issued and the terms of the reinsurance contracts and are included in Premiums and policy fees, net, and Policyholder benefits, net of recoveries, respectively, in the Consolidated Statements of Operations. Insurance liabilities are reported before the effects of reinsurance. Account balances and future policy benefit reserves and policy and contract claims covered under reinsurance contracts are recorded in Reinsurance and investment contract recoverables on the Consolidated Balance Sheets. Amounts paid or deemed to have been paid for claims covered by reinsurance contracts are recorded as Receivables on the Consolidated Balance Sheets. Reinsurance and investment contract recoverables are recognized in a manner consistent with the liabilities related to the underlying reinsured contracts. Amounts due to other insurer

Risk Disclosures

Risk Disclosures	12 Months Ended
	Dec. 31, 2017
Risk Disclosures	(3) Risk Disclosures The following is a description of the significant risks facing the Company and how it attempts to mitigate those risks: (a) Credit Risk Credit risk is the risk that issuers of fixed-rate and variable-rate income securities, mortgages on commercial real estate, or other parties with whom the Company has transactions, such as reinsurers and derivative counterparties, default on their contractual obligations, resulting in unexpected credit losses. The Company mitigates this risk by adhering to investment policies and limits that provide portfolio diversification on an asset class, asset quality, creditor, and geographical basis, and by complying with investment limitations from applicable state insurance laws and regulations. The Company considers all relevant objective information available in estimating the cash flows related to structured securities. The Company actively monitors and manages exposures, and determines whether any securities are impaired. The aggregate credit risk is influenced by management’s risk/return preferences, the economic and credit environment, and the ability to manage this risk through liability portfolio management. For derivative counterparties, the Company mitigates credit risk by tracking and limiting exposure to each counterparty through limits that are reported regularly and, once breached, restricts further trades; establishing relationships with counterparties rated BBB+ and higher; and monitoring the credit default swap of each counterparty as an early warning signal to cease trading when credit default swap spreads imply severe impairment in credit quality. The Company executes Credit Support Annexes (CSA) with all active and new counterparties which further limits credit risk by requiring counterparties to post collateral to a segregated account to cover any counterparty exposure. (b) Credit Concentration Risk Credit concentration risk is the risk of increased exposure to significant asset defaults (of a single security issuer or class of security issuers); economic conditions (if business is concentrated in a certain industry sector or geographic area); or adverse regulatory or court decisions (if concentrated in a single jurisdiction) affecting credit. Concentration risk exposure is monitored regularly. The Company’s Finance Committee, responsible for asset/liability management (ALM) issues, recommends an investment policy to the Company’s Board of Directors (BOD) and approves the strategic asset allocation and accompanying investment mandates for an asset manager with respect to asset class. The investment policy and accompanying investment mandates specify asset allocation among major asset classes and the degree of asset manager flexibility for each asset class. The investment policy complies, at a minimum, with state statutes. Compliance with the policy is monitored by the Finance Committee who is responsible for implementing internal controls and procedures. Deviations from the policy are monitored and addressed. The Finance Committee and, subsequently, the BOD review the investment policy at least annually. To further mitigate this risk, internal concentration limits based on credit rating and sector are established and are monitored regularly. Any ultimate obligor group exceeding these limits is placed on a restricted list to prevent further purchases, and the excess exposure may be actively sold down to comply with concentration limit guidelines. Any exceptions require Chief Risk Officer approval and monitoring by the Risk Committee. Further, the Company performs a quarterly concentration risk calculation to ensure compliance with certain state insurance regulations. (c) Liquidity Risk Liquidity risk is the risk that unexpected timing or amounts of cash needed will require liquidation of assets in a market that will result in a realized loss or an inability to sell certain classes of assets such that an insurer will be unable to meet its obligations and contractual guarantees. Liquidity risk also includes the risk that in the event of a company liquidity crisis, refinancing is only possible at higher interest rates. Liquidity risk can be affected by the maturity of liabilities, the presence of withdrawal penalties, the breadth of funding sources, and terms of funding sources. It can also be affected by counterparty collateral triggers as well as whether anticipated liquidity sources, such as credit agreements, are cancelable. The Company manages liquidity within four specific domains: (1) monitoring product development, product management, business operations, and the investment portfolio; (2) setting ALM strategies; (3) managing the cash requirements stemming from the Company’s derivative dynamic economic hedging activities; and (4) establishing liquidity facilities to provide additional liquidity. The Company has established liquidity risk limits, which are approved by the Company’s Risk Committee, and the Company monitors its liquidity risk regularly. The Company also sets target levels for the liquid securities in its investment portfolio. (d) Interest Rate Risk Interest rate risk is the risk that movements in interest rates or interest rate volatility will cause a decrease in the value of an insurer’s assets relative to the value of its liabilities and/or an unfavorable change in prepayment activity resulting in compressed interest margins. The Company has an ALM strategy to align cash flows and duration of the investment portfolio with policyholder liability cash flows and duration. The Company further limits interest rate risk on variable annuity guarantees through economic interest rate hedges. (e) Equity Market Risk Equity market risk is the risk that movements in equity prices or equity volatility will cause a decrease in the value of an insurer’s assets relative to the value of its liabilities. The policy value of the fixed-indexed universal life, fixed-indexed annuity, and variable-indexed annuity products is linked to equity market indices. The Company economically hedges this exposure with derivatives. Variable annuity products may provide a minimum guaranteed level of benefits irrespective of market movements. The Company has adopted an economic hedging program to manage the equity risk of these products. The Company monitors the impacts of equity stress scenarios on assets and liabilities regularly. Basis risk is the risk that variable annuity hedge asset value changes unexpectedly relative to the value of the underlying separate account funds of the variable annuity contracts. Basis risk may arise from the Company’s inability to directly hedge the underlying investment options of the variable annuity contracts. The Company mitigates this risk through regular review and synchronization of fund mappings, product design features, and hedge design. (f) Operational Risk Operational risk is the risk of loss resulting from inadequate or failed internal processes and systems, from human misbehavior or error, or from external events. Operational risk is comprised of the following seven risk categories: (1) external fraud; (2) internal fraud; (3) employment practices and workplace safety; (4) clients/third-party, products and business practices; (5) damage to physical assets; (6) business disruption and system failure; and (7) execution, delivery, and process management. Operational risk is comprehensively managed through a combination of core qualitative and quantitative activities. The Operational Risk Management framework includes the following key activities: (1) loss data capture identifies historical operational events that meet a designated threshold to ensure transparency and remediation of each event; (2) an integrated risk and control system is performed to proactively manage significant operational risk scenarios throughout the organization; and (3) scenario analyses are conducted to quantify operational risk capital. (g) Legal/Regulatory Risk Legal/regulatory risk is the risk that changes in the legal or regulatory environment in which the Company operates may result in reduced demand for its products or additional expenses not assumed in product pricing. Additionally, the Company is exposed to risk related to how the Company conducts itself in the market and the suitability of its product sales to contract holders. The Company mitigates this risk by offering a broad range of products and by operating throughout the United States. The Company actively monitors all market-related exposure and participates in national and international discussions relating to legal, regulatory, and accounting changes that may impact the business. A formal process exists to assess the Company’s risk exposure to changes in regulation including monitoring by the Compliance and Legal departments and regular reporting to the BOD of all known compliance risks and the effectiveness of the approach used to mitigate such risks. In addition, the Company has implemented suitability standards to mitigate suitability risk. (h) Ratings Risk Ratings risk is the risk that rating agencies change their outlook or rating of the Company or a subsidiary of the Company. The rating agencies generally utilize proprietary capital adequacy models in the process of establishing ratings for the Company. The Company is at risk of changes in these models and the impact that changes in the underlying business that it is engaged in can have on such models. To mitigate this risk, the Company maintains regular communications with the rating agencies and evaluates the impact of significant transactions on such capital adequacy models and considers the same in the design of transactions to minimize the adverse impact of this risk. Rating agency capital is calculated and analyzed regularly. Stress tests are performed regularly to assess how rating agency capital adequacy models would be impacted by severe economic events. (i) Mortality/Longevity Risk Mortality/longevity risk is the risk that mortality experience is different than the life expectancy assumptions used by the Company to price its products. The Company mitigates mortality risk primarily through reinsurance, whereby the Company cedes a significant portion of its mortality risk to third parties. The Company also manages mortality risk through the underwriting process. Both mortality and longevity risks are managed through the review of life expectancy assumptions and experience in conjunction with active product management. (j) Lapse Risk Lapse risk is the risk that actual lapse experience evolves differently than the assumptions used for pricing and valuation exercises leading to a significant loss in Company value and/or income. The Company mitigates this risk by performing sensitivity analysis at the time of pricing to affect product design, regular ALM analysis and exercising management levers at issue, as well as post-issue as experience evolves. The Company quantifies lapse risk regularly. (k) Cyber Security Risk Cyber security risk is the risk of losses due to external and/or internal attacks impacting the confidentiality, integrity, and/or availability of key systems, data, and processes reliant on digital technology. The Company has implemented preventative, detective, response, and recovery measures including firewalls, intrusion detection and prevention, advanced malware detection, spyware and anti-virus software, email protection, email and laptop encryption, web content filtering, web application firewalls, and regular scanning of all servers and network devices to identify vulnerabilities. Controls are implemented to prevent and review unauthorized access. (l) Reinsurance Risk Reinsurance risk is the risk that reinsurance companies default on their obligation where the Company has ceded a portion of its insurance risk. The Company uses reinsurance to limit its risk exposure to certain business lines and to enable better capital management. Reinsurance contracts do not relieve the Company from its obligations to policyholders. Failure of reinsurers to honor their obligations could result in losses to the Company. The Company mitigates this risk by requiring certain counterparties to meet thresholds related to the counterparty’s credit rating, exposure, or other factors. If the thresholds are not met by those counterparties, they are required to establish a trust or letter of credit backed by assets meeting certain quality criteria. All arrangements are regularly monitored to determine whether trusts or letters of credit are sufficient to support the ceded liabilities and that their terms are being met. Also, the Company reviews the financial standings and ratings of its reinsurance counterparties and monitors concentrations of credit risk to minimize its exposure to significant losses from reinsurer insolvencies regularly.

Investments

Investments	12 Months Ended
	Dec. 31, 2017
Investments	(4) Investments (a) Fixed-Maturity Securities and Equity Securities At December 31, 2017 and 2016 , the amortized cost or cost, gross unrealized gains, gross unrealized losses, and fair values of available-for-sale and held-to-maturity securities are as shown in the following tables: Amortized cost or cost Gross unrealized gains Gross unrealized losses Fair value 2017: Fixed-maturity securities, available-for-sale: U.S. government $ 2,449,361 15,159 23,066 2,441,454 Agencies not backed by the full faith and credit of the U.S. government 6,692 232 107 6,817 States and political subdivisions 10,177,673 1,154,762 14,709 11,317,726 Foreign government 523,356 19,773 2,516 540,613 Corporate securities 65,145,715 5,068,907 169,349 70,045,273 Mortgage-backed securities 14,297,121 246,150 117,431 14,425,840 CDO 15,243 12,322 — 27,565 Total fixed-maturity securities, available-for-sale 92,615,161 6,517,305 327,178 98,805,288 Equity securities, available-for-sale: Common stock 259,573 10,836 — 270,409 Preferred stock 1,500 — — 1,500 Total equity securities, available-for-sale 261,073 10,836 — 271,909 Total available-for-sale securities $ 92,876,234 6,528,141 327,178 99,077,197 Amortized cost or cost Gross unrealized gains Gross unrealized losses Fair value 2016: Fixed-maturity securities, available-for-sale: U.S. government $ 1,712,400 41,003 16,880 1,736,523 Agencies not backed by the full faith and credit of the U.S. government 8,766 113 22 8,857 States and political subdivisions 9,379,273 612,248 36,908 9,954,613 Foreign government 426,724 21,006 8,803 438,927 Corporate securities 60,668,745 3,489,117 617,795 63,540,067 Mortgage-backed securities 11,824,876 189,019 165,842 11,848,053 CDO 8,861 11,070 — 19,931 Total fixed-maturity securities, available-for-sale 84,029,645 4,363,576 846,250 87,546,971 Fixed-maturity securities, held-to-maturity: Corporate securities 28 5 — 33 CDO — 3,597 — 3,597 Total fixed-maturity securities, held-to-maturity 28 3,602 — 3,630 Equity securities, available-for-sale: Common stock 316,541 3,625 — 320,166 Total available-for-sale and held-to-maturity securities $ 84,346,214 4,370,803 846,250 87,870,767 At December 31, 2017 and 2016 , the Company did not have any OTTI losses in AOCI. The net unrealized gains (losses) on available-for-sale securities , held-for-sale securities and effective portion of cash flow hedges consist of the following at December 31 : 2017 2016 2015 Available-for-sale securities: Fixed-maturity $ 6,190,127 3,517,326 1,553,935 Equity 10,836 3,625 (2,394 ) Held-for-sale securities — 614 798 Cash flow hedges (41,993 ) (29,547 ) 16,013 Adjustments for: Shadow adjustments (3,007,245 ) (1,728,234 ) (825,607 ) Deferred taxes (1,055,043 ) (617,324 ) (259,961 ) Net unrealized gains (losses) $ 2,096,682 1,146,460 482,784 The unrealized gain on held-for-sale securities in 2016 and 2015 relates to fixed-maturity securities that were transferred from available-for-sale due to the expected sale of a subsidiary. The subsidiary was subsequently sold in 2017. See note 19 for further details. The amortized cost and fair value of available-for-sale fixed-maturity securities at December 31, 2017 , by contractual maturity, are shown below: Amortized cost Fair value Fixed-maturity securities, available-for-sale: Due in one year or less $ 2,218,716 2,249,030 Due after one year through five years 13,236,678 13,781,829 Due after five years through ten years 21,315,386 21,909,438 Due after ten years 40,556,205 45,411,155 Structured securities 15,288,176 15,453,836 Total fixed-maturity securities, available-for-sale $ 92,615,161 98,805,288 Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Fixed-maturity securities not due at a single maturity date have been presented in the year of final contractual maturity. Structured securities are shown separately, as they are not due at a single maturity. As of December 31, 2017 and 2016 , investments with a fair value of $24,179 and $28,098 , respectively, were held on deposit with various insurance departments and in other trusts as required by statutory regulations. The Company’s fixed-maturity security portfolios include mortgage-backed securities. Due to the high quality of these investments and the lack of subprime loans within the securities, the Company does not have a material exposure to subprime mortgages. (b) Unrealized Investment Losses The following table summarizes the fair value and related unrealized losses on available-for-sale securities that have been in a continuous loss position for the respective years ended December 31 are shown below: 12 months or less Greater than 12 months Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses 2017: Fixed-maturity securities, available-for-sale: U.S. government $ 1,583,775 9,319 472,276 13,747 2,056,051 23,066 Agencies not backed by the full faith and credit of the U.S. government 4,357 107 — — 4,357 107 States and political subdivisions 221,614 2,612 250,963 12,097 472,577 14,709 Foreign government 81,717 830 35,805 1,686 117,522 2,516 Corporate securities 4,053,797 37,776 3,507,087 131,573 7,560,884 169,349 Mortgage-backed securities 3,434,109 24,415 2,791,216 93,016 6,225,325 117,431 Total temporarily impaired securities $ 9,379,369 75,059 7,057,347 252,119 16,436,716 327,178 12 months or less Greater than 12 months Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses 2016: Fixed-maturity securities, available-for-sale: U.S. government $ 691,559 16,880 — — 691,559 16,880 Agencies not backed by the full faith and credit of the U.S. government 3,332 22 — — 3,332 22 States and political subdivisions 1,587,063 30,524 103,316 6,384 1,690,379 36,908 Foreign government 99,527 6,634 10,383 2,169 109,910 8,803 Corporate securities 12,637,792 433,682 2,000,338 184,113 14,638,130 617,795 Mortgage-backed securities 5,003,928 164,368 31,040 1,474 5,034,968 165,842 Total temporarily impaired securities $ 20,023,201 652,110 2,145,077 194,140 22,168,278 846,250 As of December 31, 2017 and 2016 , there were 865 and 1,088 available-for-sale fixed-maturity security holdings that were in an unrealized loss position, respectively. As of December 31, 2017 and 2016 , of the total amount of unrealized losses, $303,565 or 92.8% and $ 763,051 or 90.2% , respectively, are related to unrealized losses on investment grade securities. Investment grade is defined as a security having a credit rating of Aaa, Aa, A, or Baa from Moody’s or a rating of AAA, AA, A, or BBB from Standards and Poor’s (S&P), or a NAIC rating of 1 or 2 if a Moody’s or S&P rating is not available. Unrealized losses on securities are principally related to changes in interest rates or changes in sector spreads from the date of purchase. As contractual payments continue to be met, management continues to expect all contractual cash flows to be received and does not consider these investments to be other-than-temporarily impaired. (c) OTTI Losses The following table presents a rollforward of the Company’s cumulative credit impairments on fixed-maturity securities held at December 31 : 2017 2016 Balance as of January 1 $ 115,430 59,365 Additions for credit impairments recognized on: Securities not previously impaired 48,574 174,823 Reductions for credit impairments previously on: Securities that matured, were sold, or were liquidated during the period (111,956 ) (118,758 ) Balance as of December 31 $ 52,048 115,430 (d) Realized Investment Gains (Losses) Gross and net realized investment gains (losses) for the years ended December 31 are summarized as follows: 2017 2016 2015 Available-for-sale: Fixed-maturity securities: Gross gains on sales and exchanges $ 151,815 198,851 108,094 Gross losses on sales and exchanges (37,415 ) (71,002 ) (15,272 ) OTTI (48,574 ) (172,530 ) (57,598 ) Net gains (losses) on fixed-maturity securities 65,826 (44,681 ) 35,224 Equity securities: Gross gains on sales 5,289 3,109 2 Gross losses on sales (1,054 ) (897 ) (184 ) Net gains (losses) on equity securities 4,235 2,212 (182 ) Net gains (losses) on available-for-sale securities 70,061 (42,469 ) 35,042 Held-to-maturity securities: Gross gains on sales and exchanges 4,244 — 31,832 Gross losses on sales and exchanges (11 ) (11 ) (11 ) Net gains (losses) on held-to-maturity securities 4,233 (11 ) 31,821 Gain on real estate sales — — 5,929 Other 9,328 (6,845 ) 21,621 Net realized investment gains (losses) $ 83,622 (49,325 ) 94,413 The 2015 realized gain on real estate sales is related to the recognition of a contingent gain as part of the terms of the 2011 sale of the Company’s real estate portfolio. The gross gain in held-to-maturity securities relates primarily to the impact of consolidating a CDO investment in 2015, which was subsequently sold in 2017. See note 4(j) for further discussion regarding the consolidation and sale of the CDO investment. Proceeds from sales of available-for-sale securities for the years ended December 31 are presented in the following table: 2017 2016 2015 Available-for-sale securities: Fixed-maturity $ 2,567,050 2,177,408 996,801 Equity 136,911 152,821 58,858 (e) Trading Gains and Losses The portion of trading gains and losses for the year ended December 31 related to trading securities still held at the reporting date is shown below: 2017 2016 2015 Net gains (losses) recognized during the period on trading securities $ 21,109 12,133 (17,268 ) Less: Net gains (losses) recognized during the period on trading securities sold during the period 7,738 (2,205 ) 576 Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date $ 13,371 14,338 (17,844 ) (f) Interest and Similar Income Major categories of Interest and similar income, net, for the respective years ended December 31 are shown below: 2017 2016 2015 Interest and similar income: Available-for-sale fixed-maturity securities $ 3,968,147 3,847,272 3,752,867 Held-to-maturity fixed-maturity securities 58 1,012 5,746 Mortgage loans on real estate 559,236 470,547 413,103 Derivative assets 13,622 11,121 5,197 Loans to affiliates 625 384 516 Policy loans 9,794 10,015 9,834 Available-for-sale equity securities 6,752 11,314 1,416 Fair value option and trading equity securities 10,647 6,814 11,838 Other invested assets 13,977 32,857 32,618 Short-term securities and cash and cash equivalents 27,878 13,896 8,761 Total 4,610,736 4,405,232 4,241,896 Less: Investment expenses 88,517 79,495 66,427 Total interest and similar income, net $ 4,522,219 4,325,737 4,175,469 (g) Fixed-Maturity Securities Purchased with Deteriorated Credit Quality The Company acquired fixed-maturity securities for which there was evidence of credit quality deterioration since origination and for which it was probable at the acquisition date that the Company would be unable to collect all contractually required payments. The outstanding balance and carrying amount of the fixed-maturity securities purchased with deteriorated credit quality at December 31 are shown below: 2017 2016 Fixed-maturity securities, available-for-sale: Outstanding balance $ 301,715 261,260 Carrying amount 183,045 139,863 The following table presents activity for the accretable yield on fixed-maturity securities purchased with deteriorated credit quality: 2017 2016 Fixed-maturity securities, available-for-sale: Balance, beginning of year $ 102,221 135,075 Additions 11,487 — Accretion (11,687 ) (19,798 ) Reclassifications from nonaccretable difference (4,024 ) (4,805 ) Disposals — (8,251 ) Balance, end of year $ 97,997 102,221 Fixed-maturity securities acquired each year for which it was probable at acquisition that all contractually required payments would not be collected are as follows: 2017 2016 2015 Fixed-maturity securities, available-for-sale: Contractually required payments receivable $ 69,695 — 99,975 Cash flows expected to be collected 55,425 — 65,489 Basis in acquired securities 43,938 — 39,823 (h) Mortgage Loans on Real Estate The Company's investment in mortgage loans on real estate at December 31, 2017 and 2016 was entirely comprised of commercial loans. At December 31, 2017 and 2016 , the Company's mortgage loans on real estate portfolio include concentrations exceeding 10% for the following states: 2017 2016 Concentration Amount Concentration % Concentration Amount Concentration % California $ 2,951,697 25.0 % $ 2,925,356 28.1 % Illinois (1) — — 1,085,445 10.4 (1) Mortgage loans on real estate in Illinois did not exceed 10% of the Company's mortgage loan portfolio in 2017. The maximum lending rates for mortgage loans made during 2017 and 2016 were 4.9% and 4.6% , respectively. The minimum lending rates for mortgage loans made during 2017 and 2016 were 3.4% and 3.0% , respectively. Credit quality indicators and allowance for loan loss for mortgage loans on real estate is discussed further at note 7. (i) Securities Lending and Reverse Repurchase Agreements The Company had fair value of securities on loan of $2,613,073 and $ 2,798,597 with associated collateral received of $2,675,912 and $ 2,888,157 , as of December 31, 2017 and 2016 , respectively. Of the total collateral received from the respective counterparties, noncash collateral was $18,866 and $326,938 and cash collateral was $2,657,046 and $2,561,219 as of December 31, 2017 and 2016 , respectively. The collateral received by loaned security type at December 31 is as follows: 2017 2016 Remaining contractual maturity of the agreements Remaining contractual maturity of the agreements Open (1) Open (1)(2) Foreign government $ 25,788 10,551 Corporate securities 2,650,124 2,877,606 Total $ 2,675,912 2,888,157 (1) There is no contractual maturity on the lending agreements. The related loaned security could be returned to the Company on the next business day with notice from the counterparty and the Company would be required to return the collateral immediately. (2) The previously issued 2016 Consolidated Financial Statements disclosed only the cash collateral received by loaned security type. These amounts have been updated to conform with current year presentation to include noncash and cash collateral received by loaned security type. Reinvested collateral is recorded in Collateral held from securities lending agreements on the Consolidated Balance Sheets. The amount and type of reinvested collateral at December 31 is as follows: 2017 2016 Cash and cash equivalents $ 1,668,868 1,445,249 Short-term investments 988,178 1,115,970 Total $ 2,657,046 2,561,219 In the normal course of business, the Company enters into overnight reverse repurchase agreements which are used to earn spread income. As part of the reverse repurchase agreements, the Company lends cash and receives U.S. Government securities as collateral. The Company had fair value of reverse repurchase agreements of $860,800 and $100,000 recorded in Cash and cash equivalents on the Consolidated Balance Sheets with associated collateral received of $864,279 and $100,000 as of December 31, 2017 and 2016 , respectively. (j) Variable Interest Entities The Company invests in structured securities and limited partnerships which represent interests in VIEs. The Company has carefully analyzed the VIEs to determine whether the Company is the primary beneficiary, taking into consideration whether the Company, or the Company together with its affiliates, has the power to direct the activities of the VIE, that most affect its economic performance and whether the Company has the right to benefits from the VIE. The Company has concluded that it is not the primary beneficiary for any of the VIEs invested in by the Company as of December 31, 2017 . As of December 31, 2016 , the Company determined it was the primary beneficiary for one of the VIEs invested in by the Company and, as such, only one VIE was consolidated in the Consolidated Financial Statements. In 2015, a triggering event for consolidation occurred for one VIE when the Company entered into an agreement with the collateral manager to liquidate some or all of the collateral underlying several classes of notes within one of the CDOs. Creditors of the consolidated VIE do not have any recourse on the Company. The Company does not have any implicit or explicit arrangements to provide financial support to the consolidated VIE. Upon initial consolidation, the Company recorded the underlying assets at fair value, generating a gain of $31,832 in Realized investment (losses) gains, net in the Consolidated Statements of Operations. Subsequent to the consolidation of the CDO, at the Company’s direction, the collateral manager liquidated assets at auction, of which a portion were purchased by the Company. The assets purchased at auction were reported at amortized cost as Other invested assets and at fair value as Fixed-maturity securities, available-for-sale on the Consolidated Balance Sheets. As of December 31, 2016, the Company held $43,640 as Other invested assets and $10,604 as Fixed-maturity securities, available-for-sale on the Consolidated Balance Sheets. As of December 31, 2016, the Company also held $19,833 of consolidated assets that are reported at fair value as Fixed-maturity securities, available-for-sale on the Consolidated Balance Sheets. In addition, the Company had recorded liabilities of $565 as of December 31, 2016 related to the consolidation of this entity. The liabilities are reported in Other liabilities on the Consolidated Balance Sheets. In February 2017, the Company sold its interest for $16,540 and deconsolidated the VIE. The sale generated a loss of $1,541 which is recorded in Realized investment (losses) gains, net in the Consolidated Statements of Operations. The carrying amount and maximum exposure to loss relating to VIEs in which the Company is not deemed to be the primary beneficiary as of December 31 were as follows: 2017 2016 Carrying amount Maximum exposure to loss (1) Carrying amount Maximum exposure to loss (1) Fixed-maturity securities, available-for-sale: Corporate securities $ 1,000,431 1,000,431 981,066 981,066 Mortgage-backed securities 14,425,840 14,425,840 11,823,561 11,823,561 CDO 27,565 27,565 19,931 19,931 Total fixed-maturity securities, available-for-sale 15,453,836 15,453,836 12,824,558 12,824,558 Other invested assets 78,230 387,639 205,302 487,711 Total investments $ 15,532,066 15,841,475 13,029,860 13,312,269 (1) The maximum exposure to loss is equal to the carrying amount for Fixed-maturity securities, available-for-sale. The maximum exposure to loss related to Other invested assets is equal to the carrying amount plus any unfunded commitments.

Derivatives and Hedging Instrum

Derivatives and Hedging Instruments	12 Months Ended
	Dec. 31, 2017
Derivatives and Hedging Instruments	(5) Derivatives and Hedging Instruments Derivatives held by the Company are designated as either a cash flow hedging instrument (cash flow hedge) or nonqualified hedging instrument (nonqualifying strategies). Cash Flow Hedges IRS were used by the Company to hedge against the changes in cash flows associated with variable interest rates on certain underlying fixed-maturity securities until January 2015 when the Company exited these positions. Foreign currency swaps have notional amounts and maturity dates equal and offsetting to the underlying fixed-maturity securities and are determined to be highly effective as of December 31, 2017 and 2016 . On March 31, 2017, the Company changed its retrospective hedge effectiveness test methodology and moved to a regression model. Regression testing utilizes statistical analysis to assess the correlation of the changes in cash flows between the hedging instrument and the hedged item through the use of a hypothetical derivative. In order to change the retrospective test methodology, the Company redesignated all qualifying hedge relationships. The dedesignation and subsequent redesignation occurred contemporaneously. The following table presents the components of the unrealized gains and losses on the effective portion of the derivatives that qualify as cash flow hedges recorded within the Consolidated Statements of Comprehensive Income (Loss): Amount of gains (losses) recognized in AOCI at December 31, 2017 2016 2015 Interest rate swaps, net of tax benefit of $0, $0, and $332, at December 31, 2017, 2016, and 2015, respectively $ — — (617 ) Foreign currency swaps, net of tax benefit (expense) of $37,215, ($12,355), and ($15,550), at December 31, 2017, 2016, and 2015, respectively (69,113 ) 22,945 28,879 Total $ (69,113 ) 22,945 28,262 The following tables presents the amount of gains reclassified from AOCI into earnings on the effective and ineffective portion of the derivatives that qualify as cash flow hedges: Amount of gains reclassified from AOCI into earnings for the years end December 31 (effective portion): Location in the 2017 2016 2015 Foreign currency swaps , net of tax expense of $4,768, $3,892, and $1,819, at December 31, 2017, 2016, and 2015, respectively $ 8,854 7,229 3,378 Interest and similar income, net Total $ 8,854 7,229 3,378 Amount of gains reclassified from AOCI into earnings for the years end December 31 (ineffective portion): Location in the 2017 2016 2015 Foreign currency swaps, net of tax expense of $247, $85, and $0, at December 31, 2017, 2016, and 2015, respectively $ 459 158 — Change in fair value of assets and liabilities Total $ 459 158 — Using December 31, 2017 values, it is estimated that a post-tax gain of approximately $11,813 will be reclassified from AOCI into earnings during the subsequent twelve months ending December 31, 2018 . The maximum amount of time for which these cash flows are hedged is 16 years . See note 22 for a rollforward of cash flow hedges in AOCI. Nonqualifying Strategies Futures and Options Contracts OTC options and ETO are cleared through the Options Clearing Corporation (OCC), which operates under the jurisdiction of both the Securities and Exchange Commission (SEC) and the Commodities Futures Trading Commission. The fair values of the collateral posted for futures , OTC options , and ETO are discussed in the derivative collateral management section below. Interest Rate Swaps The Company can receive the fixed or variable rate and are traded in varying maturities. The fair values of the collateral posted and variation margin for OTC and centrally cleared IRS are discussed in the derivative collateral management section below. Credit Default Swaps The CDS within the investment portfolios assume credit risk from a single entity or referenced index for the purpose of synthetically replicating investment transactions. The Company can be required to pay or be the net receiver on the contract depending on the net position. Credit events include bankruptcy of the reference and failure to pay by the reference. The notional amount is equal to the maximum potential future loss amount. The fair value of the collateral posted for centrally cleared CDS is discussed in the derivative collateral management section below. The following table presents the notional amount, fair value, weighted average years to maturity, underlying referenced credit obligation type, and average credit ratings for the credit derivatives in which the Company was assuming credit risk as of December 31 : Credit Derivative type by derivative risk exposure and reference type Notional amount Fair value Weighted average years to maturity Average credit rating 2017: Basket credit default swaps Investment grade risk exposure U.S. corporate credit $ 175,800 (1,498 ) 6 years BBB+ Total $ 175,800 (1,498 ) 2016: Basket credit default swaps Investment grade risk exposure U.S. corporate credit $ 331,400 367 6 years BBB+ Total $ 331,400 367 Total Return Swaps The Company engages in the use of OTC TRS, which allow the parties to exchange cash flows based on a variable reference rate such as the three-month LIBOR and the return of an underlying index. The fair value of the collateral posted for OTC TRS is discussed in the derivative collateral management section below. To Be Announced Securities The Company uses OTC TBA forward contracts to gain exposure to the investment risk and return of mortgage-backed securities. Typically, the price is agreed upon at the time of the contract and payment for such a contract is made at a specified future date. The fair value of the collateral posted for OTC TBA securities is discussed in the derivative collateral management section below. The following table presents a summary of the aggregate notional amounts and fair values of the Company’s freestanding derivative instruments reported on the Consolidated Balance Sheets as of December 31 : 2017 2016 Gross Fair Value Gross Fair Value Notional (1) Assets Liabilities Notional (1) Assets Liabilities Cash flow hedging instruments Foreign currency swaps $ 899,000 $ 38,939 (68,354 ) 676,000 96,975 (11,731 ) Total cash flow hedging instruments 38,939 (68,354 ) 96,975 (11,731 ) Nonqualifying hedging instruments Futures 27,891,125 — — 17,574,373 — — OTC options 119,817,491 1,156,749 (815,960 ) 77,973,809 766,205 (514,758 ) ETO 17,033,569 48,177 (27,678 ) 11,109,074 42,400 (27,345 ) IRS 3,763,500 130,476 (162 ) 7,227,500 144,384 (77,799 ) TRS 2,944,000 12,375 — 7,154,000 5,826 (3,702 ) TBA securities 1,474,100 4 (953 ) 693,900 833 (299 ) SAR — — — 7,422 * 545 — Total nonqualifying hedging instruments 1,347,781 (844,753 ) 960,193 (623,903 ) Total freestanding derivative instruments $ 1,386,720 (913,107 ) 1,057,168 (635,634 ) (1) Notional amounts are presented on a gross basis. * The notional amount for SAR is equal to the number of contracts outstanding. Derivative Collateral Management The Company manages separate collateral for exchange-traded and OTC derivatives. The total collateral posted for exchange-traded derivatives at December 31, 2017 and 2016 , had a fair value of $ 2,029,211 and $ 1,447,970 , respectively, and is included in Fixed-maturity securities on the Consolidated Balance Sheets. The Company retains ownership of the exchange-traded collateral, but the collateral resides in an account designated by the exchange. The collateral is subject to specific exchange rules regarding rehypothecation. The total collateral posted for OTC derivatives at December 31, 2017 and 2016 , had a fair value of $ 137,383 and $ 49,133 , respectively, and is included in Fixed-maturity securities on the Consolidated Balance Sheets. The Company posts collateral to OTC counterparties based upon exposure amounts. The Company retains ownership of the OTC collateral. Embedded Derivatives The Company issues certain variable annuity products with guaranteed minimum benefit riders, including GMWB and GMAB, which are measured at fair value separately from the host variable annuity contract, with changes in fair value reported in Change in fair value of annuity and life embedded derivatives within the Consolidated Statements of Operations. These embedded derivatives are classified within Account balances and future policy benefit reserves on the Consolidated Balance Sheets. Certain fixed-indexed annuity products and universal life policies include equity-indexed features, which are separated as an embedded derivative, and referred to as a market value liability option (MVLO). This embedded derivative is reported within Account balances and future policy benefit reserves on the Consolidated Balance Sheets with changes in fair value reported in Change in fair value of annuity and life embedded derivatives within the Consolidated Statements of Operations. Additionally, the Company bifurcated and separately recorded embedded derivatives related to modified coinsurance reinsurance agreements. The embedded derivatives are recorded within Derivative assets and Derivative liabilities on the Consolidated Balance Sheets, with changes in fair value reported in Change in fair value of assets and liabilities within the Consolidated Statements of Operations. See note 19 for further detail regarding the modified coinsurance reinsurance agreement entered into by the Company with an affiliate. The following table presents a summary of the fair values of the Company’s embedded derivative instruments reported on the Consolidated Balance Sheets as of December 31 : 2017 2016 GMWB $ (2,004,918 ) (2,156,234 ) GMAB (181,348 ) (243,363 ) MVLO (20,137,427 ) (15,141,482 ) Other embedded derivatives, net (570 ) 1,863 Total embedded derivative instruments $ (22,324,263 ) (17,539,216 ) The following table presents the gains or losses recognized in income on the various nonqualifying freestanding derivative instruments and embedded derivatives: Amount of gain (loss) on derivatives recognized for the years ended December 31, Location in the 2017 2016 2015 GMWB Change in fair value of annuity and life embedded derivatives $ 151,177 14,235 (679,259 ) GMAB Change in fair value of annuity and life embedded derivatives 61,658 96,666 (122,094 ) MVLO Change in fair value of annuity and life embedded derivatives (5,175,605 ) (386,709 ) 212,758 Total change in fair value of annuity and life embedded derivatives (4,962,770 ) (275,808 ) (588,595 ) Futures Change in fair value of assets and liabilities 2,362,617 (287,724 ) (423,134 ) OTC options Change in fair value of assets and liabilities 1,375,643 182,882 (361,419 ) ETO Change in fair value of assets and liabilities 54,103 13,055 291 IRS Change in fair value of assets and liabilities 127,777 87,380 279,158 CDS Change in fair value of assets and liabilities 2,074 4,689 (2,220 ) TRS Change in fair value of assets and liabilities 48,228 (37,143 ) 4,093 TBA securities Change in fair value of assets and liabilities 4,078 (2,837 ) 330 SAR Change in fair value of assets and liabilities 100 (54 ) 630 Other embedded Change in fair value of assets and liabilities (8,120 ) (1,234 ) 1,235 Total change in fair value of assets and liabilities 3,966,500 (40,986 ) (501,036 ) MVLO Premiums and policy fees, net 9,911 (398,942 ) 79,951 MVLO Policyholder benefits, net of recoveries 169,749 139,481 115,737 Total derivative gain (loss), net $ (816,610 ) (576,255 ) (893,943 ) Offsetting Assets and Liabilities Certain financial instruments and derivative instruments are eligible for offset on the Consolidated Balance Sheets under GAAP. The Company’s derivative instruments are subject to master netting arrangements and collateral arrangements. A master netting arrangement with a counterparty creates a right of offset for amounts due to and from that same counterparty that is enforceable in the event of a default or bankruptcy. The Company’s policy is to recognize amounts subject to master netting arrangements on a gross basis on the Consolidated Balance Sheets. The following tables present additional information about derivative assets and liabilities subject to an enforceable master netting arrangement as of the dates indicated: December 31, 2017 Gross amounts not offset in the Balance Sheet Gross amounts recognized Gross amounts offset in the Balance Sheet Net amounts presented in the Balance Sheet Financial instruments (1) Collateral (received) / pledged Net amounts Derivative assets $ 1,386,720 — 1,386,720 (855,461 ) (485,646 ) 45,613 Derivative liabilities (913,107 ) — (913,107 ) 855,461 134,000 76,354 Net derivatives $ 473,613 — 473,613 — (351,646 ) 121,967 December 31, 2016 Gross amounts not offset in the Balance Sheet Gross amounts recognized Gross amounts offset in the Balance Sheet Net amounts presented in the Balance Sheet Financial instruments (1) Collateral (received) / pledged Net amounts Derivative assets $ 1,056,623 — 1,056,623 (615,349 ) (395,913 ) 45,361 Derivative liabilities (635,634 ) — (635,634 ) 615,349 37,092 16,807 Net derivatives $ 420,989 — 420,989 — (358,821 ) 62,168 (1) Represents the amount of assets or liabilities that could be offset by liabilities or assets with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets. In the tables above, the gross amounts of assets or liabilities as presented on the Consolidated Balance Sheets are offset first by financial instruments that have the right of offset under master netting or similar arrangements, then any remaining amount is reduced by the amount of cash and securities collateral.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Measurements	(6) Fair Value Measurements The Fair Value Measurement Topic of the Codification establishes a fair value hierarchy that prioritizes the inputs used in the valuation techniques to measure fair value. Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access at the measurement date. Level 2 – Valuations derived from techniques that utilize observable inputs, other than quoted prices included in Level 1, which are observable for the asset or liability either directly or indirectly, such as: (a) Quoted prices for similar assets or liabilities in active markets. (b) Quoted prices for identical or similar assets or liabilities in markets that are not active. (c) Inputs other than quoted prices that are observable. (d) Inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 – Valuations derived from techniques in which the significant inputs are unobservable. Level 3 fair values reflect the Company’s own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk). The Company has analyzed the valuation techniques and related inputs, evaluated its assets and liabilities reported at fair value, and determined an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Based on the results of this evaluation and investment class analysis, each financial asset and liability was classified into Level 1, 2, or 3. The following presents the assets and liabilities measured at fair value on a recurring basis and their corresponding level in the fair value hierarchy at December 31: 2017 Total Level 1 Level 2 Level 3 Assets Fixed-maturity securities, available-for-sale: U.S. government $ 2,441,454 2,441,454 — — Agencies not backed by the full faith and credit of the U.S. government 6,817 — 6,817 — States and political subdivisions 11,317,726 — 11,276,965 40,761 Foreign government 540,613 — 507,166 33,447 Corporate securities 70,045,273 — 59,074,307 10,970,966 Mortgage-backed securities 14,425,840 — 14,425,811 29 CDO 27,565 — 27,565 — Fixed-maturity securities, trading 36,219 30,901 5,168 150 Derivative assets 1,388,190 48,177 1,327,638 12,375 Equity securities, available-for-sale 271,909 258,095 — 13,814 Equity securities, fair value option and trading 314,370 288,098 26,272 — Separate account assets 28,192,877 28,192,877 — — Total assets $ 129,008,853 31,259,602 86,677,709 11,071,542 Liabilities Derivative liabilities $ (915,147 ) (27,678 ) (887,469 ) — Reserves at fair value (1) (27,387,975 ) — — (27,387,975 ) Total liabilities $ (28,303,122 ) (27,678 ) (887,469 ) (27,387,975 ) 2016 Total Level 1 Level 2 Level 3 Assets Fixed-maturity securities, available-for-sale: U.S. government $ 1,736,523 1,736,523 — — Agencies not backed by the full faith and credit of the U.S. government 8,857 — 8,857 — States and political subdivisions 9,954,613 — 9,925,338 29,275 Foreign government 438,927 — 404,687 34,240 Corporate securities 63,540,067 — 54,990,599 8,549,468 Mortgage-backed securities 11,848,053 — 11,806,849 41,204 CDO 19,931 — — 19,931 Fixed-maturity securities, trading 37,051 36,901 — 150 Derivative assets 1,059,031 42,400 1,010,805 5,826 Equity securities, available-for-sale 320,166 320,166 — — Equity securities, fair value option and trading 317,493 298,481 19,012 — Separate account assets 27,733,261 27,733,261 — — Total assets $ 117,013,973 30,167,732 78,166,147 8,680,094 Liabilities Derivative liabilities $ (635,634 ) (27,345 ) (604,587 ) (3,702 ) Reserves at fair value (1) (20,152,641 ) — — (20,152,641 ) Total liabilities $ (20,788,275 ) (27,345 ) (604,587 ) (20,156,343 ) (1) Reserves at fair value are reported in Account balances and future policy benefit reserves on the Consolidated Balance Sheets. The following is a discussion of the methodologies used to determine fair values for the assets and liabilities listed in the above table. These fair values represent an exit price (i.e., what a buyer in the marketplace would pay for an asset in a current sale or charge to transfer a liability). (a) Valuation of Fixed-Maturity Securities and Equity Securities The fair value of fixed-maturity securities and equity securities is based on quoted market prices in active markets when available. Based on the market data, the securities are categorized into asset class, and based on the asset class of the security, appropriate pricing applications, models and related methodology, and standard inputs are utilized to determine what a buyer in the marketplace would pay for the security in a current sale. When quoted prices are not readily available or in an inactive market, standard inputs used in the valuation models, listed in approximate order of priority, include, but are not limited to, benchmark yields, reported trades, Municipal Securities Rulemaking Board reported trades, Nationally Recognized Municipal Securities Information Repository material event notices, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic events. In some cases, including private placement securities and certain difficult-to-price securities, internal pricing models may be used that are based on market proxies. Generally, U.S. Treasury securities and exchange-traded stocks are included in Level 1. Most bonds for which prices are provided by third-party pricing sources are included in Level 2, because the inputs used are market observable. Bonds for which prices were obtained from broker quotes, certain bonds without active trading markets and private placement securities that are internally priced are included in Level 3. At December 31, 2017 and 2016 , private placement securities of $11,045,203 and $8,509,548 , respectively, were included in Level 3. Internal pricing models based on market proxy spread and U.S. Treasury rates are used to value these holdings. (b) Valuation of Derivatives Active markets for OTC options do not exist. The fair value of OTC options is derived internally, by calculating their expected discounted cash flows, using a set of calibrated, risk-neutral stochastic scenarios, including a market data monitor, a market data model generator, a stochastic scenario calibrator, and the actual asset pricing calculator. The valuation results are reviewed by Management via the Pricing Committee. OTC options that are internally priced , foreign currency swaps, CDS, TBA securities, and IRS are included in Level 2, because they use market observable inputs. TRS are included in Level 3 because they use valuation techniques in which significant inputs are unobservable. The fair value of ETOs are based on quoted market prices and are generally included in Level 1. Certain derivatives are priced using external third-party vendors. The Company has controls in place to monitor the valuations of these derivatives. Using market observable inputs, IRS prices are derived from a third-party source and are independently recalculated internally and reviewed for reasonableness at the position level on a monthly basis. TRS prices are obtained from the respective counterparties. These prices are also internally recalculated and reviewed for reasonableness at the position level on a monthly basis. The Company also has embedded derivatives related to modified coinsurance reinsurance agreements. The fair value of the agreements are calculated either as a CDS or TRS, depending on the nature of the agreement. The derivatives are included in Level 2 as the valuations use market observable inputs. See note 19 for further detail regarding the modified coinsurance reinsurance agreement entered into by the Company with an affiliate. The Company participates in a stock-based compensation plan sponsored by Allianz SE, which awards certain employees SAR that are tied to Allianz SE stock. Allianz SE provides the valuation on a monthly basis to each operating entity. Although these contracts are tied to Allianz SE stock which is actively traded, the exit market is not the same, so they have been included in Level 2. (c) Valuation of Separate Account Assets Separate account assets are carried at fair value, which is based on the fair value of the underlying assets. Funds in the separate accounts are primarily invested in variable investment option funds with the following investment types: bond, domestic equity, international equity, or specialty. Variable investment option funds are included in Level 1 because their fair value is based on net asset values that are quoted as prices (unadjusted) in an active, observable market. Additionally, the separate accounts hold certain money market funds which are also included in Level 1 because their fair value is based on quoted prices (unadjusted) in an active, observable market. (d) Valuation of Reserves at Fair Value Reserves at fair value principally include the equity-indexed features contained in fixed-indexed annuity and life products, certain variable annuity riders and variable-indexed annuity products. Fair values of the embedded derivative liabilities are calculated based on internally developed models, because active, observable markets do not exist for these liabilities. The fair value is derived from techniques in which one or more significant inputs are unobservable and are included in Level 3. These fair values represent the Company’s best estimate of an amount that could be realized in a current market exchange absent actual market exchanges. The fair value of the embedded derivative contained in the fixed-indexed annuity products is the sum of the current year’s option value projected stochastically, the projection of future index growth at the option budget, and the historical interest/equity-indexed credits. The valuation of the embedded derivative includes an adjustment for the Company’s own credit standing and a risk margin for noncapital market inputs. The fair value of the embedded derivative contained in the fixed-indexed universal life insurance products is the amount of the current year’s option value in excess of a fixed crediting valuation over the remainder of the policy year. The valuation of the embedded derivative includes an adjustment for the Company’s own credit standing and a risk margin for noncapital market inputs. The Company issues certain variable annuity products with GMWB and GMAB riders. The fair value for these riders is estimated using the present value of future benefits minus the present value of future fees using actuarial and capital market assumptions related to the projected cash flows over the expected lives of the contracts. A risk neutral valuation methodology is used under which the cash flows from the riders are projected under multiple capital market scenarios using observable market interest rates. The valuation of these riders includes an adjustment for the Company’s own credit standing and a risk margin for noncapital market inputs. The Company’s own credit adjustment is determined by taking into consideration publicly available information on industry default risk with considerations for the Company’s own credit profile. Risk margin is incorporated into the valuation model to capture the noncapital market risks of the instrument, which represent the additional compensation a market participant would require to assume the risks related to the uncertainties of certain actuarial assumptions including surrenders, annuitization, premium persistency, and future equity index caps or participation rates. The establishment of the risk margin requires the use of significant management judgment. Market conditions including, but not limited to, changes in interest rates, equity indices, market volatility, changes in the Company’s own credit standing, and variations in actuarial assumptions regarding contractholder behavior and risk margins related to noncapital market inputs may result in significant fluctuations in the fair value of embedded derivatives that could materially affect net income. The Company elected the fair value option for insurance contracts related to the variable-indexed annuity product. The fair value is calculated internally using the present value of future expected cash flows, floored at the current contract value. Future expected cash flows are generated using contractual features, actuarial assumptions, and market emergence over a complete set of market consistent scenarios. Cash flows are then averaged over the scenario set and discounted back to the valuation date using the appropriate discount factors adjusted for nonperformance risk on the noncollateralized portions of the contract. (e) Level 3 Rollforward The following table provides a reconciliation of the beginning and ending balances for the Company’s Level 3 assets and liabilities measured at fair value on a recurring basis: 2017 Fixed-maturity securities Available-for-sale Trading States and political subdivisions Foreign government Corporate securities Mortgage-backed securities CDO Corporate securities Balance, beginning of year $ 29,275 34,240 8,549,468 41,204 19,931 150 Total realized/unrealized gains (losses) included in: Net income (loss) — — (9,227 ) 678 11,139 — Other comprehensive income (loss) 1,482 (793 ) 310,320 1,279 (11,070 ) — Purchases and issuances 10,004 — 2,660,329 — — — Sales and settlements — — (444,638 ) (24,556 ) (20,000 ) — Transfer out of Level 3 — — (95,286 ) (18,576 ) — — Balance, end of year $ 40,761 33,447 10,970,966 29 — 150 Gains (losses) included in net income related to financial instruments still held at the end of the year $ — — 956 — — — 2016 Fixed-maturity securities Available-for-sale Trading States and political subdivisions Foreign government Corporate securities Mortgage-backed securities CDO Corporate securities Balance, beginning of year $ 499 33,373 7,021,597 54,906 21,164 — Total realized/unrealized gains (losses) included in: Net income (loss) — — (86,539 ) 1,393 — — Other comprehensive income (loss) 790 867 272,556 302 (503 ) — Purchases and issuances 27,986 — 2,054,111 730 — 150 Sales and settlements — — (428,407 ) (16,127 ) (730 ) — Transfer out of Level 3 — — (283,850 ) — — — Balance, end of year $ 29,275 34,240 8,549,468 41,204 19,931 150 Gains (losses) included in net income related to financial instruments still held at the end of the year $ — — (80,134 ) — — 2017 2016 Equity securities, Available-for-sale Derivative assets Derivative liabilities Reserves at fair value (1) Derivative assets Derivative liabilities Reserves at fair value (1) Balance, beginning of year $ — 5,826 (3,702 ) (20,152,641 ) 2,350 (33,812 ) (18,096,009 ) Total realized/unrealized gains (losses) included in: Net income (loss) — 188,230 (101,030 ) (5,550,779 ) 553,778 (583,731 ) (649,516 ) Other comprehensive income (loss) 1,496 — — — — — — Purchases and issuances 12,318 — — (3,186,229 ) — — (2,805,725 ) Sales and settlements — (181,681 ) 104,732 1,501,674 (550,302 ) 613,841 1,398,609 Balance, end of year $ 13,814 12,375 — (27,387,975 ) 5,826 (3,702 ) (20,152,641 ) Gains (losses) included in net income related to financial instruments still held at the end of the year $ — 6,549 3,702 (5,550,779 ) 3,476 (30,111 ) (649,516 ) (1) The Company classifies realized and unrealized gains (losses) on Reserves at fair value as unrealized gains (losses) for purposes of disclosure in this table because the Company monitors Reserves at fair value as a whole unit and does not track realized gains (losses) on a contract-by-contract basis. (f) Transfers The Company reviews its fair value hierarchy classifications annually. Transfers between levels occur when there are changes in the observability of inputs and market activity. Transfers into and/or out of Levels 1, 2, and 3 are reported as of the end of the period in which the change occurs. In 2017 , transfers into Level 3 were $0 and transfers out of Level 3 were $113,862 . In 2016 , transfers into Level 3 were $0 and transfers out of Level 3 were $283,850 . All transfers out of Level 3 were recategorized as Level 2 as quoted market prices for similar securities became available, were considered reliable, and could be validated against an alternative source. There were no transfers between Level 1 and Level 2 for the years ended December 31, 2017 and 2016 . (g) Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs The following table provides a summary of the significant unobservable inputs used in the fair value measurements developed by the Company or reasonably available to the Company of Level 3 assets and liabilities on a recurring basis at December 31: 2017 Fair value Valuation technique Unobservable input Range (weighted average) Fixed-maturity securities: Available-for-sale: States and political subdivisions $ 40,761 Discounted cash flow Option adjusted spread* 161 (161) Foreign government 33,447 Discounted cash flow Option adjusted spread 42 - 50 (48) Corporate securities 10,970,966 Discounted cash flow Option adjusted spread 27 - 515 (130) Mortgage-backed securities 29 Third-party vendor Default and discount rates ** Trading: Corporate securities 150 Cost N/A N/A Equity securities: Available-for-sale: Common stock 12,314 Consensus pricing Indicative quotes ($ per share)* $23.65 ($23.65) Preferred stock 1,500 Cost N/A N/A Derivative assets: TRS 12,375 Third-party vendor Spread and discount rates ** Derivative liabilities: TRS — Third-party vendor Spread and discount rates ** Reserves at Fair Value: MVLO (20,137,427 ) Discounted cash flow Annuitizations 0 - 25% Surrenders 0 - 25% Mortality*** 0 - 100% Withdrawal benefit election 0 - 50% GMWB and GMAB (2,186,266 ) Discounted cash flow Surrenders 0.5% - 35% Mortality*** 0% - 100% Variable-indexed annuity (5,064,282 ) Contract value N/A**** N/A**** 2016 Fair value Valuation technique Unobservable input Range (weighted average) Fixed-maturity securities: Available-for-sale: States and political subdivisions $ 29,275 Discounted cash flow Option adjusted spread* 166 (166) Foreign government 34,240 Discounted cash flow Option adjusted spread 62 - 75 (70) Corporate securities 8,549,468 Discounted cash flow Option adjusted spread -214 - 2,112 (147) CDO 19,931 Third-party vendor Default and discount rates ** Mortgage-backed securities 41,204 Third-party vendor Default and discount rates ** Trading: Corporate securities 150 Cost N/A N/A Derivative assets: TRS 5,826 Third-party vendor Spread and discount rates ** Derivative liabilities: TRS (3,702 ) Third-party vendor Spread and discount rates ** Reserves at Fair Value: MVLO (15,141,482 ) Discounted cash flow Annuitizations 0 – 25% Surrenders 0 – 25% Mortality*** 0 – 100% Withdrawal benefit election 0 – 50% GMWB and GMAB (2,399,597 ) Discounted cash flow Surrenders 0.5 – 35% Mortality*** 0 – 100% Variable-indexed annuity (2,611,562 ) Contract value N/A**** N/A**** * No range is applicable due to only one security within classification. ** Management does not have insight into the specific assumptions used. See narrative below for qualitative discussion. *** Mortality assumptions are derived from the Annuity 2000 Mortality Table. See note 14 for further discussion. **** Unobservable inputs are not applicable as the fair value of the variable-indexed annuity reserve is floored at contract value. (h) Sensitivity of Fair Value Measurements to Changes in Unobservable Inputs Fixed-maturity securities: The primary unobservable input used in the discounted cash flow models for states and political subdivisions, foreign government, and corporate fixed-maturity securities , available-for-sale is a corporate index option adjusted spread (OAS). The corporate index OAS used is based on a security's sector, rating, and average life. A significant increase (decrease) of the corporate index OAS in isolation could result in a decrease (increase) in fair value. CDO and mortgage-backed securities are priced by a third-party vendor and the Company internally reviews the valuation for reasonableness. The Company does not have insight into the specific inputs used; however, the key unobservable inputs would generally include default rates. A significant increase (decrease) in default rates in isolation could result in an decrease (increase) in fair value. Equity securities: The primary unobservable input used to value common stock are indicative quotes received from third-party vendors. A significant increase (decrease) in the indicative quotes in isolation could result in a decrease (increase) in fair value. Derivative assets and liabilities: The TRS are priced by a third-party vendor and the Company internally reviews the valuation for reasonableness. The Company does not have insight into the specific inputs used; however, the key unobservable input would generally include the spread. For a long position, a significant increase (decrease) in the spread used in the fair value of the TRS in isolation could result in higher (lower) fair value. For a short position, a significant increase (decrease) in the spread used in the fair value of the TRS in isolation could result in lower (higher) fair value. Reserves at fair value: A significant increase (decrease) in the utilization of annuitization benefits could result in a higher (lower) fair value. A significant decrease (increase) in mortality rates, surrender rates, or utilization of lifetime income benefits could result in a higher (lower) fair value. (i) Nonrecurring Fair Value Measurements Occasionally, certain assets and liabilities are measured at fair value on a nonrecurring basis. There were no nonrecurring fair value adjustments recorded in 2017 , 2016 , or 2015 . (j) Fair Value of Financial Instruments Carried at Other Than Fair Value The following table presents the carrying amount and fair value of certain financial instruments that are not reported at fair value at December 31: 2017 Carrying Fair value amount Level 1 Level 2 Level 3 Total Financial assets Mortgage loans on real estate $ 11,761,939 — — 12,372,775 12,372,775 Loans to affiliates 39,120 — — 39,120 39,120 Policy loans 184,409 — 184,409 — 184,409 Other invested assets 302,216 196,672 — 105,544 302,216 Cash equivalents 1,442,057 581,257 860,800 — 1,442,057 Receivables 123,110 — — 123,110 123,110 Reinsurance and investment contract recoverables 1,248,634 — — 1,298,499 1,298,499 Collateral held from securities lending agreements 2,657,046 — 2,657,221 — 2,657,221 COLI 578,951 — 578,951 — 578,951 Financial liabilities Investment contracts $ (79,019,361 ) — — (79,519,680 ) (79,519,680 ) Mortgage notes payable (68,628 ) — — (77,637 ) (77,637 ) Securities lending payable (2,657,046 ) — (2,657,046 ) — (2,657,046 ) Other liabilities (123,110 ) — — (123,110 ) (123,110 ) Separate account liabilities (28,192,877 ) (28,192,877 ) — — (28,192,877 ) 2016 Carrying Fair value amount Level 1 Level 2 Level 3 Total Financial assets Held-to-maturity fixed-maturity securities $ 28 — — 3,630 3,630 Mortgage loans on real estate 10,351,741 — — 10,900,205 10,900,205 Loans to affiliates 39,120 — — 39,120 39,120 Policy loans 171,012 — 171,012 — 171,012 Other invested assets 357,210 — — 426,137 426,137 Cash equivalents 1,250,015 1,150,015 100,000 — 1,250,015 Receivables 144,180 — — 144,180 144,180 Reinsurance and investment contract recoverables 933,074 — — 987,327 987,327 Collateral held from securities lending agreements 2,561,219 — 2,561,985 — 2,561,985 COLI (1) 338,092 — 338,092 — 338,092 Financial liabilities Investment contracts $ (77,305,738 ) — — (78,018,770 ) (78,018,770 ) Mortgage notes payable (76,916 ) — — (87,981 ) (87,981 ) Securities lending payable (2,561,219 ) — (2,561,219 ) — (2,561,219 ) Other liabilities (144,180 ) — — (144,180 ) (144,180 ) Separate account liabilities (1) (27,733,261 ) (27,733,261 ) — — (27,733,261 ) (1) The previously issued 2016 Consolidated Financial Statements improperly disclosed COLI and Separate account liabilities as financial instruments measured at fair value on a recurring basis. These financial instruments have been corrected in the above table to conform with current year presentation as they are carried at other than fair value. The fair value of fixed-maturity securities classified as “held-to-maturity” is calculated internally with cash flow models using unobservable inputs. The fair value of mortgage loans on real estate is calculated by analyzing individual loans and assigning ratings to each loan based on a combination of loan-to-value ratios and debt service coverage ratios. Default rates and loss severity factors are then applied to each loan and a fair value is determined based on these factors as well as the contractual cash flows of each loan and the current market interest rates for similar loans. Loans to affiliates are carried at cost. Due to the lack of an active market, the current carrying value is the only market price at which the transaction could be settled, the Company believes cost approximates fair value. Policy loans are supported by the underlying cash value of the policies and are carried at unpaid principal balances plus accrued investment income. As policy loans function like demand deposits, the current carrying value is the only market price at which the transaction could be settled. Due to the lack of an active market and uncertainty on receiving contractual cash flows, the Company believes the carrying value approximates fair value. Other invested assets primarily include short-term securities, FHLB stock, loans to non-affiliates, and LIH investments. The carrying value of the Company's short-term securities is considered a reasonable estimate of fair value due to their short-term maturities and are included in Level 1. The investments in FHLB stock and loans to non-affiliates are carried at cost, which is deemed to approximate fair value as the current carrying value is the only market price at which the transaction could be settled due to the lack of an active market. The fair value of LIH investments is calculated internally by calculating the expected discounted cash flows utilizing the respective funding and benefits schedule for each investment using unobservable inputs. The investments in FHLB stock, loans to non-affiliates, and LIH investments are included in Level 3 due to the use of unobservable inputs. Cash equivalents include short-term, highly liquid debt instruments purchased with an original maturity of three months or less, short-term government money market funds, overnight commercial paper, and overnight reverse-repurchase agreements. Due to the short-term nature of these investments, carrying value is deemed to approximate fair value. Of the cash equivalents held, the fair value of short-term, highly liquid debt instruments, short-term government money market funds, and overnight commercial paper is based on quoted market prices and these investments are included in Level 1. Overnight reverse-repurchase agreements are included Level 2 due to the use of quoted prices for similar assets in active markets. Included in Receivables and Other liabilities is the LIH investments unfunded commitment asset and liability. The fair value is calculated internally by discounting the expected future commitments based upon the respective funding schedule for each investment using unobservable inputs. Collateral held from securities lending agreements is primarily comprised of cash and cash equivalents and highly liquid fixed-maturity securities. Fair values are determined and classified within the fair value hierarchy in a manner consistent with the method utilized to determine the fair value of similar securities held within the Company’s general account investment portfolio. The COLI policies held by the Company are carried at their respective cash surrender values, which approximates fair value. The cash surrender value of the policies is based on the value of the underlying assets, which are regularly priced utilizing observable inputs. Investment contracts include certain reserves related to annuity and life products. These reserves are included in Account balances and future policy benefit reserves on the Consolidated Balance Sheets. The fair values of the investment contracts are determined by testing amounts payable on demand against discounted cash flows using market interest rates commensurate with the risks involved, including consideration of the Company’s own credit standing and a risk margin for noncapital market inputs. Reinsurance and investment contracts recoverable represent the ceded portions of investment contracts. The methods and assumptions used to determined the fair value are consistent with those used to value investment contracts. The fair value of mortgage notes payable is the sum of the outstanding balance of the note payable plus the expected prepayment penalty due to the lender if the Company were to prepay the mortgage. The Company believes this approximates fair value, as the calculation of the prepayment penalty is based on current market interest rates and represents lost interest to the lender and is an exit price. The penalty is based on specific provisions provided by the lender, which is an unobservable input. Securities lending payable is set equal the to the cash collateral received. Due to the short-term nature of these loans, the carrying value is deemed to approximate fair value. Separate account liabilities are recorded at the amount credited to the contractholder, which reflects the change in fair value of the corresponding separate account assets including contractholder deposits less withdrawals and fees. As such, the carrying value is deemed to approximate fair value.

Financing Receivables

Financing Receivables	12 Months Ended
	Dec. 31, 2017
Financing Receivables	(7) Financing Receivables The Company’s financing receivables are comprised of mortgage loans, nontrade receivables, loans to affiliates, and loans to non-affiliates. Mortgage loans consist of the unpaid balance of mortgage loans on real estate. Nontrade receivables are amounts for policy or contract premiums due from the agents and broker-dealers, or amounts due from reinsurers. Loans to affiliates include loans to related parties to fund certain companywide projects. Loans to non-affiliates are loans that are intended to meet certain financial objectives of the Company, AZOA, and Allianz SE. The mortgage loans and nontrade receivables are evaluated on a collective basis for impairment unless circumstances arise that warrant individual evaluation. The loans to affiliates and loans to non-affiliates are evaluated individually and did not require an allowance as of December 31, 2017 and 2016 . For additional information, see note 2 for receivables, note 4 for mortgage loans, and note 19 for loans to affiliates. Credit Quality Indicators The Company analyzes certain financing receivables for credit risk by using specific credit quality indicators. The Company has determined the loan-to-value ratio and the debt service coverage ratio are the most reliable indicators in analyzing the credit risk of its mortgage loan portfolio. The loan-to-value ratio is based on the Company’s internal valuation methodologies, including discounted cash flow analysis and comparative sales, depending on the characteristics of the property being evaluated. The debt service coverage ratio analysis is normalized to reflect a 25 year amortization schedule. The credit quality as of December 31 is shown below: Debt Service Coverage Ratios Greater than 1.4x 1.2x – 1.4x 1.0x – 1.2x Less than 1.0x Total Percent of Total 2017: Loan-to-value ratios: Less than 50% $ 3,742,536 52,805 64,700 66,486 3,926,527 33.3 % 50% – 60% 4,205,942 225,433 62,516 14,315 4,508,206 38.2 60% – 70% 2,449,915 597,222 72,784 — 3,119,921 26.4 70% – 80% 74,854 169,431 — — 244,285 2.1 80% – 90% — — — — — — 90% – 100% — — — — — — Greater than 100% — — — — — — Total $ 10,473,247 1,044,891 200,000 80,801 11,798,939 100.0 % Debt Service Coverage Ratios Greater than 1.4x 1.2x – 1.4x 1.0x – 1.2x Less than 1.0x Total Percent of Total 2016: Loan-to-value ratios: Less than 50% $ 3,694,757 133,289 53,761 — 3,881,807 37.3 % 50% – 60% 3,740,956 173,453 23,378 18,930 3,956,717 38.0 60% – 70% 1,442,783 502,746 26,005 43,607 2,015,141 19.4 70% – 80% 198,103 153,481 24,086 — 375,670 3.6 80% – 90% 57,439 83,046 27,384 2,937 170,806 1.7 90% – 100% — — — — — — Greater than 100% — — — — — — Total $ 9,134,038 1,046,015 154,614 65,474 10,400,141 100.0 % The Company’s nontrade receivables are analyzed for credit risk based upon the customer classification of the agent or reinsurer. The nontrade receivable and allowance for credit losses by customer classification as of December 31 are shown below: 2017 2016 Agent Reinsurer Total Agent Reinsurer Total Nontrade receivables $ 14,167 27,710 41,877 11,860 20,963 32,823 Allowance for credit losses (4,301 ) — (4,301 ) (4,876 ) — (4,876 ) Net nontrade receivables $ 9,866 27,710 37,576 6,984 20,963 27,947 Rollforward of Allowance for Credit Losses The allowances for credit losses and recorded investment in financing receivables as of December 31 are shown below: Mortgage loans Nontrade receivables Loans to affiliates Loans to non-affiliates Total 2017: Financing receivables, gross $ 11,798,939 41,877 39,120 10,137 11,890,073 Allowance for credit losses: Beginning balance 48,400 4,876 — — 53,276 Provision / (benefit) (11,400 ) (575 ) — — (11,975 ) Ending balance 37,000 4,301 — — 41,301 Financing receivables ending balance net of valuation allowance $ 11,761,939 37,576 39,120 10,137 11,848,772 Mortgage loans Nontrade receivables Loans to affiliates Loans to non-affiliates Total 2016: Financing receivables, gross $ 10,400,141 32,823 39,120 10,145 10,482,229 Allowance for credit losses: Beginning balance 37,400 5,525 — — 42,925 Provision / (benefit) 11,000 (649 ) — — 10,351 Ending balance 48,400 4,876 — — 53,276 Financing receivables ending balance net of valuation allowance $ 10,351,741 27,947 39,120 10,145 10,428,953 The Company evaluates the mortgage loan allowance for loan loss quarterly, which resulted in a change of the provision of $ (11,400) and $ 11,000 for the years ended December 31, 2017 and 2016 , respectively. In 2017, the decrease to the mortgage loan allowance is driven by a reduction in expected losses and reserves based on the improving credit quality of our portfolio and industry analysis showing improving market conditions. The increase to the allowance for loan loss in 2016 was a result of the growing asset base of the mortgage loan portfolio partially offset by improving quality indicators. Past-Due Aging Analysis Aging analysis of past-due financing receivables as of December 31 is shown below: 31-60 days past due 61-90 days past due Greater than 90 days past due Total past due Current Total 2017: Mortgage loans $ — — — — 11,798,939 11,798,939 Nontrade receivables 9,955 1,279 8,200 19,434 22,443 41,877 Loans to affiliates — — — — 39,120 39,120 Loans to non-affiliates — 18 481 499 9,638 10,137 Total $ 9,955 1,297 8,681 19,933 11,870,140 11,890,073 31-60 days past due 61-90 days past due Greater than 90 days past due Total past due Current Total 2016: Mortgage loans $ — — — — 10,400,141 10,400,141 Nontrade receivables 7,590 1,662 6,712 15,964 16,859 32,823 Loans to affiliates — — — — 39,120 39,120 Loans to non-affiliates 109 10 71 190 9,955 10,145 Total $ 7,699 1,672 6,783 16,154 10,466,075 10,482,229 As of December 31, 2017 and 2016 , the Company’s financing receivables did not include any balances which are on a nonaccrual status, classified as a troubled debt restructuring, or impaired without a corresponding allowance for credit loss.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2017
Reinsurance	(8) Reinsurance The Company primarily enters into reinsurance agreements to manage risk resulting from its life, annuity, and accident and health businesses, as well as businesses the Company has chosen to exit. In the normal course of business, the Company seeks to limit its exposure to loss by ceding risks under yearly renewal term, coinsurance, and modified coinsurance. The Company generally retained between $1,000 and $5,000 coverage per individual life depending on the type of policy for the years ended December 31, 2017 and 2016 . The Company monitors the financial exposure and financial strength of the reinsurers on an ongoing basis. The Company attempts to mitigate risk by securing recoverable balances with various forms of collateral, including arranging trust accounts and letters of credit with certain reinsurers. Reinsurance and investment contract recoverables at December 31, 2017 and 2016 are secured by collateral of $3,970,978 and $3,419,252 , respectively. The effect of reinsurance on premiums is disclosed in Schedule IV in the Consolidated Financial Statements. The effect of reinsurance on benefits for the respective years ended December 31 is shown below: 2017 2016 2015 Direct benefits Life $ 425,845 263,594 175,293 Annuities 6,601,650 2,015,225 2,333,922 Accident and health 566,988 630,148 590,984 Total direct benefits 7,594,483 2,908,967 3,100,199 Less: Ceded to other companies Life 73,471 67,801 65,118 Annuities 33,230 33,024 39,481 Accident and health 376,797 427,153 395,226 Total ceded to other companies 483,498 527,978 499,825 Plus: Assumed from other companies Life 127 650 1,057 Annuities 1,701 1,520 1,663 Accident and health 16,426 19 — Total assumed from other companies 18,254 2,189 2,720 Total benefits $ 7,129,239 2,383,178 2,603,094 Components of the Company's reinsurance and investment contract recoverables as of December 31 are shown below: 2017 2016 Life $ 986,636 1,031,953 Annuities 1,275,293 890,709 Accident and health 3,033,557 2,765,256 Total reinsurance and investment contract recoverables $ 5,295,486 4,687,918 The Life, Annuities, and Accident and health categories presented in the tables above are prescribed splits based on product and will differ from the results of the segments disclosed within note 24. The Company did not write off any uncollectible recoverables during 2017 or 2016 .

Deferred Acquisition Costs

Deferred Acquisition Costs	12 Months Ended
	Dec. 31, 2017
Deferred Acquisition Costs	(9) Deferred Acquisition Costs DAC at December 31 and the changes in the balance for the years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ 5,246,343 6,283,236 4,362,771 Capitalization 730,825 1,006,773 911,425 Interest 239,127 172,195 181,239 Amortization (1,244,315 ) (1,438,375 ) (1,331,923 ) Change in shadow DAC (1,121,140 ) (777,486 ) 2,159,724 Balance, end of year $ 3,850,840 5,246,343 6,283,236 The Company reviews its best-estimate assumptions each year and records “unlocking” as appropriate. These reviews are based on recent changes in the operations of the Company and actual and expected performance of in-force policies. The reviews include all assumptions, including mortality, lapses, expenses, and separate account returns. The revised best estimate assumptions were applied to the current in-force policies to project future gross profits. The pretax impact on the Company’s assets and liabilities as a result of the unlocking during the years ended December 31 is as follows: 2017 2016 2015 Assets: DAC $ (177,274 ) (246,669 ) (109,797 ) DSI (35,266 ) (51,156 ) (32,400 ) VOBA — (212 ) (180 ) Reinsurance and investment contract recoverables (7,645 ) 2,934 5,471 Total increase (decrease) in assets (220,185 ) (295,103 ) (136,906 ) Liabilities: Account balances and future policy benefit reserves (330,853 ) (412,959 ) (154,064 ) Unearned premiums (7,070 ) (1,787 ) (48,369 ) Total increase (decrease) in liabilities (337,923 ) (414,746 ) (202,433 ) Net increase (decrease) in income before taxes $ 117,738 119,643 65,527

Deferred Sales Inducements

Deferred Sales Inducements	12 Months Ended
	Dec. 31, 2017
Deferred Sales Inducements	(10) Deferred Sales Inducements DSI at December 31 and the changes in the balance for years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ 764,554 1,110,192 847,000 Capitalization 14,726 29,176 48,546 Amortization (207,629 ) (277,616 ) (284,883 ) Interest 23,107 28,569 33,927 Change in shadow DSI (163,440 ) (125,767 ) 465,602 Balance, end of year $ 431,318 764,554 1,110,192 See note 9 for impacts of unlocking relating to DSI.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Taxes	(11) Income Taxes (a) Income Tax Expense (Benefit) Total income tax expense for the years ended December 31 is as follows : 2017 2016 2015 Income tax expense (benefit) attributable to operations: Current tax expense (benefit) $ 83,114 558,016 551,052 Deferred tax expense (benefit) 125,443 (202,860 ) (307,986 ) Total income tax expense (benefit) attributable to net income (loss) 208,557 355,156 243,066 Income tax effect on AOCI: Attributable to unrealized gain (loss) on: Investments 437,719 357,363 (691,519 ) Postretirement obligations (2 ) 36 — Foreign exchange 461 373 (2,159 ) Total income tax effect on equity $ 646,735 712,928 (450,612 ) (b) Components of Income Tax Expense (Benefit) Income tax expense computed at the statutory rate of 35% varies from Income tax expense reported in the Consolidated Statements of Operations for the respective years ended December 31 as follows: 2017 2016 2015 Income tax expense computed at the statutory rate $ 322,882 400,167 295,177 Dividends-received deductions and tax-exempt interest (38,369 ) (40,326 ) (40,687 ) State income tax (2,074 ) 11,266 4,642 Accrual (release) of LIH tax credits and benefits (1) 11,691 (5,819 ) (1,284 ) Accrual (release) of tax contingency reserve 522 373 (10,701 ) Foreign tax, net (3,410 ) (3,587 ) (3,143 ) COLI (14,301 ) (7,833 ) (2,285 ) Penalties 232 (47 ) 529 Deferred tax revaluation due to tax rate change (2) (70,281 ) — — Other 1,665 962 818 Income tax expense (benefit) as reported $ 208,557 355,156 243,066 (1) The Company recognized impairments on LIH investments of $18,351 during 2017 due to the tax rate change enacted in the United States. (2) On December 22, 2017, the United States passed the Tax Act of 2017 which reduced the corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017. As a result, the deferred taxes recorded on the Consolidated Balance Sheets were revalued to reflect the reduction in the future corporate tax rate. (c) Components of Deferred Tax Assets and Liabilities on the Consolidated Balance Sheets Tax effects of temporary differences giving rise to the significant components of the net deferred tax asset (liability). The net deferred tax asset (liability) on the Consolidated Balance Sheets at December 31 is as follows: 2017 2016 Deferred tax assets: Policy reserves $ 2,793,209 3,326,409 Expense accruals 5,569 40,792 Other-than-temporarily impaired assets 11,352 40,821 Provision for postretirement benefits 32,490 49,437 Other 1,148 3,267 Total deferred tax assets 2,843,768 3,460,726 Deferred tax liabilities: Policy reserves (795,733 ) — Deferred acquisition costs (589,011 ) (1,533,188 ) Investment income (303,537 ) (253,987 ) Depreciation and amortization (36,005 ) (59,822 ) Net unrealized gains on investments and foreign exchange (1,295,898 ) (1,225,720 ) Total deferred tax liabilities (3,020,184 ) (3,072,717 ) Net deferred tax asset (liabilities) $ (176,416 ) 388,009 As a result of the enactment of the Tax Act of 2017, the Company was required to revalue the deferred taxes for Policy reserves held. As the effect from the Policyholder reserves revaluation will be recognized in taxable income on a straight-line basis over the next eight year period beginning January 1, 2018, a deferred tax liability is recognized in the same amount as the deferred tax asset. Both the deferred tax asset and liability are recorded as of December 31, 2017 and are presented on a gross basis in the table above. Although realization is not assured, the Company believes it is not necessary to establish a valuation allowance for ordinary deferred tax assets, as it is more likely than not the deferred tax assets will be realized principally through future reversals of existing ordinary taxable temporary differences and future ordinary taxable income. For deferred tax assets that are capital in nature, considering all objective evidence and the available tax planning strategy, it is more likely than not the deferred tax assets that are capital in nature will be realized and no valuation allowance is required. The amount of the ordinary and capital deferred tax assets considered realizable could be reduced in the near term if estimates of future reversals of existing taxable temporary differences and future ordinary and capital taxable income are reduced. Income taxes (received)/paid by the Company were $ 267,668 , $ 914,413 , and $ 329,563 in 2017 , 2016 , and 2015 , respectively. At December 31, 2017 and 2016 , respectively, the Company had a tax (receivable)/payable from AZOA of $ (309,694) and $ (89,111) , reported in Other assets or Other liabilities on the Consolidated Balance Sheets. At December 31, 2017 and 2016 , the Company had a tax payable separate from the agreement with AZOA in the amount of $ 100 and $ 18 , respectively, reported in Other Liabilities on the Consolidated Balance Sheets. These amounts are for foreign taxes. The Company is included in the consolidated group for which AZOA files a federal income tax return on behalf of all group members. As a member of the AZOA consolidated group, the Company is no longer subject to U.S. federal and non-U.S. income tax examinations for years prior to 2014, though examinations of combined returns filed by AZOA, which include the Company by certain U.S. state and local tax authorities, may still be conducted for 2008 and subsequent years. The last Internal Revenue Service examination of AZOA involved amended returns filed by AZOA for the 2011 tax year. This examination concluded in October 2017 with the Internal Revenue Service accepting the amended returns as filed. The Internal Revenue Service has also initiated examinations of AZOA’s 2015 and 2016 income tax returns. In accordance with the Income Taxes Topic of the Codification, the Company recognizes liabilities for certain unrecognized tax benefits. Reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2017 2016 Balance at January 1 $ 1,697 1,367 Additions based on tax positions related to the current year 845 330 Amounts released related to tax positions taken in prior years (386 ) — Balance at December 31 $ 2,156 1,697 The balance at December 31, 2017 , consists of tax positions for which the deductibility is more likely than not. The disallowance would affect the annual effective tax rate. The Company does not expect any significant changes related to unrecognized tax benefits during the next 12 months. The Company recognizes the changes in unrecognized tax benefits and related accrued interest and penalties in federal income tax expense. The Company had $ 2,326 and $ 1,805 for the unrecognized tax benefits and related accrued interest at December 31, 2017 and 2016 , respectively, in Other Liabilities on the Consolidated Balance Sheets.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets	(12) Goodwill and Intangible Assets Goodwill at December 31, 2017 and 2016 , and the changes in the balance for the years then ended are as follows: 2017 2016 Balance, beginning of year $ 487,834 482,905 Increase in goodwill due to acquisition (1) — 4,929 Balance, end of year $ 487,834 487,834 The goodwill balance at December 31, 2017 and 2016 , relates to the Individual Annuity segment. See note 24 for further discussion regarding the operating segments. Intangible assets at December 31, 2017 and 2016 , and the changes in the balance for the years then ended are as follows: 2017 2016 Balance, beginning of year $ 2,496 — Increase in intangibles due to acquisition (1) — 2,872 Amortization (410 ) (376 ) Balance, end of year $ 2,086 2,496 (1) The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition. The net amortization of the intangible assets in each of the next five years is as follows: 2018 $ 410 2019 410 2020 410 2021 410 2022 410 2023 and beyond 36 Total $ 2,086 Accumulated amortization of intangible assets is $ 15,279 and $ 14,869 as of December 31, 2017 and 2016 , respectively. Goodwill and intangible assets are reviewed on an annual basis and impairment considerations are made depending on economic market conditions. There were no impairments to goodwill or intangible assets in 2017 or 2016 .

Value of Business Acquired

Value of Business Acquired	12 Months Ended
	Dec. 31, 2017
Value of Business Acquired	(13) Value of Business Acquired VOBA at December 31 and the changes in the balance for the years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ — — — Interest 64 127 210 Amortization (1,857 ) (1,619 ) (2,950 ) Change in shadow VOBA 1,793 1,492 2,740 Balance, end of year $ — — — The net amortization of the VOBA in each of the next five years is expected to be as follows: 2018 $ 1,923 2019 785 2020 and beyond — Total $ 2,708 Accumulated amortization of VOBA is $ 244,692 and $ 242,835 as of December 31, 2017 and 2016 , respectively.

Separate Accounts and Annuity P

Separate Accounts and Annuity Product Guarantees	12 Months Ended
	Dec. 31, 2017
Separate Accounts and Annuity Product Guarantees	(14) Separate Accounts and Annuity Product Guarantees The following assumptions were used to determine the GMDB and GMIB liabilities as of December 31, 2017 and 2016 : • 100 stochastically generated investment performance scenarios. • Mean investment performance assumption of 6.5% in 2017 and 2016 . • Volatility assumption of 13.4% in 2017 and 2016 . • For 2017 and 2016 , the mortality assumption is based on the Annuity 2000 mortality table for all variable products. The past mortality improvement is based on gender distinct mortality loads varying by attained age, and future mortality improvement factors are based on gender distinct projection scales varying by attained age and subject to grading factors. • Lapse rates vary by contract type and duration. As of December 31, 2017 and 2016, spike rates could approach 60% and 40%, respectively, with an ultimate rate around 15%. • Discount rates vary by contract type and equal an assumed long-term investment return (see mean investment performance assumption above), less the applicable mortality and expense rate. • GMIB contracts contain a dynamic lapse assumption. For example, if the contract is projected to have a large additional benefit, then it becomes less likely to lapse. The following assumptions were used to determine the GMAB and GMWB liabilities as of December 31, 2017 and 2016 : • 1000 stochastically generated investment performance scenarios. • Market volatility assumptions vary by fund type and grade from a current volatility number to long-term assumptions over one year as shown below: 2017 2016 Fund index type Current volatility Long-term forward volatility Current volatility Long-term forward volatility Large cap 13.4 % 18.0 % 16.3 % 18.1 % Bond 3.4 3.9 3.4 3.9 International 13.7 21.2 16.8 21.4 Small cap 17.4 21.5 20.3 21.5 • For 2017 and 2016 , the mortality assumption is based on the Annuity 2000 mortality table for all variable products. The past mortality improvement is based on gender distinct mortality loads varying by attained age, and future mortality improvement factors are based on gender distinct projection scales varying by attained age and subject to grading factors. • Lapse rates vary by contract type and duration. As of December 31, 2017 and 2016, spike rates could approach 60% and 40%, respectively, with an ultimate rate around 15%. Guaranteed minimum benefits for the respective years ended December 31 are summarized as follows (note that the amounts listed are not mutually exclusive, as many products contain multiple guarantees): 2017 2016 Account value Net amount at risk Weighted age (years) Account value Net amount at risk Weighted age (years) GMDB: Return of premium $ 26,092,333 25,909 64 23,400,820 73,163 64 Ratchet and return of premium 4,555,502 26,368 68 4,602,792 142,357 68 Ratchet and rollup 3,598,920 365,871 72 3,602,988 484,301 71 Ratchet and earnings protection rider 2,902 624 86 3,072 885 84 Reset 81,771 475 77 84,191 692 76 Earnings protection rider 236,407 26,865 70 235,360 22,383 69 Total $ 34,567,835 446,112 31,929,223 723,781 GMIB: Return of premium $ 88,576 265 74 92,121 325 73 Ratchet and return of premium 1,728,722 446 71 1,885,185 4,526 70 Ratchet and rollup 4,603,105 453,715 68 4,653,568 723,893 68 Total $ 6,420,403 454,426 6,630,874 728,744 GMAB: Five years $ 2,489,002 1,185 71 2,738,307 10,160 70 Ten years 2,994 1 84 3,212 1 82 Target date retirement-7 year 578,324 447 65 613,746 1,218 64 Target date retirement-10 year 235,167 534 62 250,033 4,559 61 Target date with management levers 3,201,192 11,720 63 3,332,790 73,070 62 Total $ 6,506,679 13,887 6,938,088 89,008 GMWB: No living benefit $ 762,569 — 69 707,212 — 69 Life benefit with optional reset 927,637 145,062 69 921,876 171,135 69 Life benefit with automatic reset 1,521,855 133,182 66 1,471,419 194,438 65 Life benefit with 8% rollup 27,283 4,380 72 28,562 6,286 70 Life benefit with 10% rollup 1,141,470 291,570 65 1,109,985 348,423 65 Life benefit with management levers 12,111,092 1,912,242 62 11,579,110 2,307,239 61 Total $ 16,491,906 2,486,436 15,818,164 3,027,521 The growth in account values has outpaced the growth in the net amount at risk in 2017 due to the increased market performance of the separate accounts. At December 31 , variable annuity account balances were invested in separate account funds with the following investment objectives. Balances are presented at fair value: Investment type 2017 2016 Bond $ 3,303,084 3,484,805 Domestic equity 14,506,783 13,959,524 International equity 1,387,275 1,308,840 Specialty 8,484,888 8,320,880 Money market 439,587 585,039 Other 71,260 74,173 Total $ 28,192,877 27,733,261 The following table summarizes the liabilities for variable contract guarantees that are reflected in the general account and shown in Account balances and future policy benefit reserves on the Consolidated Balance Sheets: GMDB GMIB GMAB GMWB Totals Balance as of December 31, 2015 $ 97,027 176,465 374,857 2,170,539 2,818,888 Incurred guaranteed benefits 9,845 (17,290 ) (96,596 ) (14,236 ) (118,277 ) Paid guaranteed benefits (17,598 ) (13,942 ) (34,898 ) (69 ) (66,507 ) Balance as of December 31, 2016 89,274 145,233 243,363 2,156,234 2,634,104 Incurred guaranteed benefits 5,492 (35,136 ) (61,660 ) (151,177 ) (242,481 ) Paid guaranteed benefits (12,789 ) (9,999 ) (355 ) (139 ) (23,282 ) Balance as of December 31, 2017 $ 81,977 100,098 181,348 2,004,918 2,368,341

Accident and Health Claim Reser

Accident and Health Claim Reserves	12 Months Ended
	Dec. 31, 2017
Accident and Health Claim Reserves	(15) Accident and Health Claim Reserves Accident and health claim reserves are based on estimates that are subject to uncertainty. Uncertainty regarding reserves of a given accident year is gradually reduced as new information emerges each succeeding year, thereby allowing more reliable reevaluations of such reserves. While management believes that reserves as of December 31, 2017 are appropriate, uncertainties in the reserving process could cause reserves to develop favorably or unfavorably in the near term as new or additional information emerges. Any adjustments to reserves are reflected in the operating results of the periods in which they are made. Movements in reserves could significantly impact the Company’s future reported earnings. Activity in the accident and health claim reserves is summarized as follows: 2017 2016 2015 Balance at January 1, net of reinsurance and investment contract recoverables of $396,850, $340,048, and $283,252, respectively $ 196,603 157,321 135,168 Adjustment primarily related to commutation and assumption reinsurance on blocks of business 242 34 323 Incurred related to: Current year 105,873 93,844 71,378 Prior years (5,496 ) 789 (4,275 ) Total incurred 100,377 94,633 67,103 Paid related to: Current year 6,451 5,829 4,331 Prior years 61,917 49,556 40,942 Total paid 68,368 55,385 45,273 Balance at December 31, net of reinsurance and investment contract recoverables of $447,140, $396,850, and $340,048, respectively $ 228,854 196,603 157,321 Prior year incurred claim reserves for 2017 were favorable as a result of re-estimation of unpaid claims and claim adjustment expenses, principally on individual LTC line of business. Prior year incurred claim reserves for 2016 were unfavorable as a result of re-estimation of unpaid claims and claim adjustment expenses, principally on individual LTC and group health lines of business. In 2015, prior year incurred claim reserves reflect favorable claim development primarily within the individual LTC line of business. This favorable development is partially due to an update to claim continuance assumptions.

Mortgage Notes Payable

Mortgage Notes Payable	12 Months Ended
	Dec. 31, 2017
Mortgage Notes Payable	(16) Mortgage Notes Payable In 2004, the Company obtained an $80,000 mortgage loan from an unrelated third-party for the Company’s headquarters. In 2005, the Company agreed to enter into a separate loan agreement with the same counterparty in conjunction with the construction of an addition to the Company’s headquarters of $65,000. This loan was funded in 2006 and combined with the existing mortgage. As of December 31, 2017 and 2016 , the combined loan had a balance of $68,628 and $ 76,916 , respectively. This 20 year, fully amortizing loan has an interest rate of 5.52%, with a maturity date of August 1, 2024. The level principal and interest payments are made monthly. The loan allows for prepayment; however, it is accompanied by a make-whole provision. The proceeds of this mortgage were used to pay off a floating rate construction loan that the Company used to finance the acquisition of property for, and construction of, the Company’s headquarters. Interest expense for all loans is $4,002 , $ 4,449 , and $ 4,871 in 2017 , 2016 , and 2015 , respectively, and is presented in General and administrative expenses in the Consolidated Statements of Operations. The future principal payments required under the loan are as follows: 2018 $ 8,758 2019 9,254 2020 9,778 2021 10,332 2022 10,918 2023 and beyond 19,588 Total $ 68,628

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies	(17) Commitments and Contingencies The Company and its subsidiaries are named as defendants in various pending or threatened legal proceedings on an ongoing basis, including three putative class action proceedings, arising from the conduct of business: Sanchez v. Allianz Life Ins. Co. of North America (Superior Court of California, L.A. County, BC594715), Berthiaume et al. v. Allianz Life Ins. Co. of North America et al (Minnesota District Court, Henn. County), and Thompson v. Allianz Life Ins. Co. of North America (United Stated District Court, District of Minnesota, Case No. 0:17-cv00096). None of these putative class actions has been certified. The Company generally intends to vigorously contest the lawsuits, but may pursue settlement negotiations in some cases, if appropriate. The outcome of the cases is uncertain at this time, and there can be no assurance that such litigation, or any future litigation, will not have a material adverse effect on the Company and/or its subsidiaries. The Company recognizes legal costs as incurred. The Company is contingently liable for possible future assessments under regulatory requirements pertaining to insolvencies and impairments of unaffiliated insurance companies. Provision has been made for assessments currently received and assessments anticipated for known insolvencies. The financial services industry, including mutual funds, variable and fixed annuities, life insurance, distribution companies, and broker-dealers, is subject to close scrutiny by regulators, legislators, and the media. Federal and state regulators, such as state insurance departments, state securities departments, the SEC, the Financial Industry Regulatory Authority, and other regulatory bodies regularly make inquiries and conduct examinations or investigations concerning various selling practices, including suitability reviews, product exchanges, sales to seniors, and compliance with, among other things, insurance and securities law. The Company is subject to ongoing market conduct examinations and investigations by regulators, which may have a material adverse effect on the Company. It can be expected that annuity and life product designs and sales practices will be an ongoing source of regulatory scrutiny and enforcement actions, litigation, and rulemaking. Private litigation regarding sales practices is ongoing against a number of insurance companies. These matters could result in legal precedents and new industry-wide legislation, rules, and regulations that could significantly affect the financial services industry, including life insurance and annuity companies. It is unclear at this time whether any such litigation or regulatory actions will have a material adverse effect on the Company in the future. When evaluating litigation, claims, and assessments, management considers the nature of the litigation, progress of the case, opinions and views of legal counsel, as well as prior experience in similar cases. Management uses this information to assess whether a loss is probable and if the amount of loss can be reasonably estimated prior to making any accruals. The Company has the following investments that require a commitment of capital for the years ended December 31, 2017 and 2016 : 2017 2016 Limited partnerships (1) $ 320,123 187,484 Private placements 383,675 448,351 Mortgage loans 458,573 414,360 Total $ 1,162,371 1,050,195 (1) Included within this caption are limited partnership investments managed by affiliates of the Company. See note 19 for additional details regarding these investments. In addition to the amounts above, the Company has LIH investments that require a commitment of capital. The Company has open capital commitments of $ 132,954 and $ 153,887 at December 31, 2017 and 2016 , respectively. The Company has recorded an unfunded commitment liability of $ 123,110 and $ 144,180 , as of December 31, 2017 and 2016 , respectively, within Other liabilities on the Consolidated Balance Sheets. The liability represents the discounted present value of the expected payments. The Company leases office space and certain furniture and equipment pursuant to operating leases with some leases containing renewal options and escalation clauses. The expense for all operating leases was $ 4,083 , $ 3,729 , and $ 3,155 in 2017 , 2016 , and 2015 , respectively. The future minimum lease payments required under operating leases are as follows: 2018 $ 2,027 2019 1,737 2020 1,310 2021 777 2022 479 2023 and beyond 448 Total $ 6,778 The Company has a service agreement (the agreement) with certain unrelated broker-dealers for a marketing support program related to the distribution of select variable insurance products. Under the agreement, the Company pays a base service fee of 0.10% on the amount of variable insurance products under management at the commencement of the agreement. An additional service fee of 0.15% is calculated on the total variable insurance products under management held in excess of this base amount. The fee is calculated on a monthly basis and is paid quarterly. Either party may terminate the agreement with a 90-day notice. Upon termination, the service fee continues to be paid from the date of termination for a period of ten years provided that the broker-dealer is not in material breach of the contract. The Company has calculated this termination commitment at December 31, 2017 , to be $ 5,965 annually with a total commitment of $ 59,654 . The calculation was based on the total variable insurance products under management as of December 31, 2017 , due to the variability in estimating future assets under management (such as sales, lapse rate, and fund performance). Total expense under the agreement amounted to $ 5,736 , $ 6,641 , and $ 6,677 in 2017 , 2016 , and 2015 , respectively.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Employee Benefit Plans	(18) Employee Benefit Plans The Company participates in the Allianz Asset Accumulation Plan (AAAP), a defined contribution plan sponsored by Allianz of America Corporation (AZOAC). Eligible employees are immediately enrolled in the AAAP on their first day of employment. The AAAP will accept participants’ pretax, Roth 401(k), and/or after-tax contributions up to 80% of the participants’ eligible compensation, although contributions remain subject to annual limitations set by the Internal Revenue Service. The Company matches up to a maximum of 7.5% of the employees’ eligible compensation. Participants are 100% vested in the Company’s matching contribution after three years of service. The AAAP administration expenses and the trust fund, including trustee fees, investment manager fees, and audit fees, are payable from the trust fund but may, at the Company’s discretion, be paid by the Company. All legal fees are paid by the Company. It is the Company’s policy to fund the AAAP costs as incurred. The Company has expensed $16,317 , $ 15,044 , and $ 14,204 , in 2017 , 2016 , and 2015 , respectively, toward the AAAP matching contributions and administration expenses. A defined group of highly compensated employees is eligible to participate in the AZOAC Deferred Compensation Plan. The purpose of the plan is to provide tax planning opportunities, as well as supplemental funds upon retirement. The plan is unfunded, meaning no assets of the Company have been segregated or defined to represent the liability for accrued assets under the plan. Employees are 100% vested upon enrollment in the plan for funds they have deferred. Employees’ funds are invested on a pay period basis and are immediately vested. Participants and the Company share the administrative fee. The accrued liability of $33,682 and $ 26,358 as of December 31, 2017 and 2016 , respectively, is recorded in Other liabilities on the Consolidated Balance Sheets. The Company sponsors a nonqualified deferred compensation plan for a defined group of agents. The Company can make discretionary contributions to the plan in the form and manner the Company determines reasonable. Discretionary contributions are currently determined based on production. The accrued liability of $92,314 and $ 64,738 as of December 31, 2017 and 2016 , respectively, is recorded in Other liabilities on the Consolidated Balance Sheets. The Company participates in a stock-based compensation plan sponsored by Allianz SE, which awards certain employees SAR and RSU that are tied to Allianz SE stock. Allianz SE determines the number of SAR and RSU granted to each participant. The Company records expense equal to the change in fair value of the units during the reporting period, which includes the Company's estimate of the number of awards expected to be forfeited. A change in value of $ 9,223 , $ 3,983 , and $ 9,820 was recorded in 2017 , 2016 , and 2015 , respectively, and is included in General and administrative expenses in the Consolidated Statements of Operations. The related liability of $18,243 and $ 13,983 as of December 31, 2017 and 2016 , respectively, is recorded in Other liabilities on the Consolidated Balance Sheets. The Company participates in the Employee Stock Purchase Plan sponsored by AZOAC that is designed to provide eligible employees with an opportunity to purchase American Depository Shares of Allianz SE at a discounted price. An aggregate amount of 250,000 ordinary shares is reserved for this plan. Allianz SE determines the purchase price of the share-based on the closing price of an ordinary share of Allianz SE on the Frankfurt stock exchange on the date of each purchase. Employees are given the opportunity to purchase these shares quarterly on predetermined dates set by Allianz SE. Employees are not allowed to sell or transfer the shares for a one-year period following the purchase settlement date. The difference between the market price and the discount price, or the discount, is paid by the Company and amounted to $1,020 , $ 946 , and $ 754 in 2017 , 2016 , and 2015 , respectively, and is recorded in General and administrative expenses in the Consolidated Statements of Operations. The discount is reflected as taxable income in the year of purchase to employees. The Company participates in the AZOAC Severance Allowance Plan. Under the AZOAC Severance Allowance Plan, all employees who are involuntarily terminated due to job elimination are eligible to receive benefits. The Company expensed $2,839 , $ 983 , and $ 1,079 in 2017 , 2016 , and 2015 , respectively, toward severance payments. This expense is recorded in the General and administrative expenses in the Consolidated Statement of Operations. The Company offers a life insurance benefit to eligible employees hired prior to January 1, 1993, who retire under the employer sponsored retirement program provided they are age 65 or age 55 with 10 or more years of service. The Company’s plan obligation at December 31, 2017 and 2016 , was $1,164 and $ 1,105 , respectively. This liability is included in Other liabilities on the Consolidated Balance Sheets. The Company closed the Welfare Benefit Trust (Trust) in 2017. The Trust’s assets were used to prefund the Company’s self-insured medical plan. The balance was $0 at December 31, 2017 and 2016 .

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2017
Related-Party Transactions	(19) Related-Party Transactions (a) Loans to Affiliates In 2015, the Company entered into an agreement to lend Allianz Technology of America (formerly known as Allianz Managed Operations and Services of America) $33,000. The interest rate was a fixed rate of 2.03%. Interest of $488 was earned during 2015 and is included in Interest and similar income, net in the Consolidated Statements of Operations. In March 2016, the $33,000 loan and accrued interest of $165 was assigned to AZOA through a dividend. In 2016, the Company entered into an agreement to lend AZOA $39,120. The remaining loan balance was $39,120 as of December 31, 2017 and 2016 and is included in Loans to affiliates on the Consolidated Balance Sheets. Repayment of this loan will begin in 2021 and has a final maturity date of August 31, 2021. The interest rate is a fixed rate of 1.61%. Interest of $630 and $214 was earned during 2017 and 2016 and is included in Interest and similar income, net in the Consolidated Statement of Operations. The Company had accrued interest of $214 as of December 31, 2017 and 2016 , respectively, and is recorded in Accrued investment income on the Consolidated Balance Sheets. (b) Investments in Limited Partnerships In 2016, the Company made an investment in a limited partnership that is managed by its affiliate, Pacific Investment Management Company (PIMCO). Subsequently, in 2017, the Company made another investment in a different limited partnership also managed by PIMCO. The total committed capital for the limited partnership investments is $70,000 and $50,114 , of which $57,000 and $44,000 was unfunded as of December 31, 2017 and 2016 , respectively. During 2016 , the Company received distributions in excess of cost of $ 413 which is included in Realized investment (losses) gains, net in the Consolidated Statements of Operations. As of December 31, 2017 and 2016 , the fair value of the investments was $14,649 and $ 6,365 and is recorded in Other invested assets on the Consolidated Balance Sheets. In 2017, the Company made an investment in a limited partnership that is managed by its affiliate, Allianz Global Investors. The Company committed capital of $ 35,000 of which $ 32,788 is unfunded as of December 31, 2017 . As of December 31, 2017 , no distributions have been received. The fair value of the investment was $ 2,084 as of December 31, 2017 and is recorded in Other invested assets on the Consolidated Balance Sheets. (c) Real Estate The Company has agreements to sublease office space to related parties wholly-owned by the same parent company, AZOA. The Company earned rental income of $990 , $909 , and $1,065 in 2017 , 2016 , and 2015 , respectively, which is included in Other revenue on the Consolidated Statements of Operations. Related to this agreement, the Company had a receivable balance of $282 and $152 at December 31, 2017 and 2016 , respectively. In addition, the Company leases office space from Allianz Global Corporate and Specialty, an affiliate, pursuant to a sublease agreement. In connection with this agreement, the Company has incurred rent expense of $28 , $27 , and $27 , in 2017 , 2016 , and 2015 , respectively, which is included in General and administrative expenses within the Consolidated Statements of Operations. (d) Service Fees The Company incurred fees for services provided by affiliated companies of $104,074 , $100,689 , and $63,530 in 2017 , 2016 , and 2015 , respectively. The Company’s liability for these expenses was $30,462 and $40,267 at December 31, 2017 and 2016 , respectively, and is included in Other liabilities on the Consolidated Balance Sheets. On a quarterly basis, the outstanding amount is settled in cash. The Company earned revenues for various services provided to affiliated companies of $27,183 , $21,568 , and $6,305 , in 2017 , 2016 , and 2015 , respectively. The receivable for these revenues was $8,153 and $8,260 at December 31, 2017 and 2016 , respectively, and is included in Receivables on the Consolidated Balance Sheets. On a quarterly basis, the outstanding amount is settled in cash. The Company has agreements with its affiliates PIMCO, Oppenheimer Capital LLC (OpCap), and with certain other related parties whereby (1) specific investment options managed by PIMCO and OpCap are made available through the Company's separate accounts to holders of the Company's variable annuity products, and (2) the Company receives compensation for providing administrative and recordkeeping services relating to the investment options managed by PIMCO and OpCap. Income recognized by the Company from these affiliates for distribution and in-force related costs as a result of providing investment options to the contractholders was $11,986 , $12,771 , and $14,102 during 2017 , 2016 , and 2015 , respectively, which is included in Fee and commission revenue in the Consolidated Statements of Operations. At December 31, 2017 and 2016 , $979 and $2,022 , respectively, were included for these fees in Receivables on the Consolidated Balance Sheets. Expenses incurred to these affiliates for management of sub-advised investment options were $0 , $441 , and $732 during 2017 , 2016 , and 2015 , respectively, which are included in General and administrative expenses in the Consolidated Statements of Operations. (e) Dividends to Parent The Company paid cash dividends to AZOA of $780,000 in 2017 . In 2016, the Company paid dividends to AZOA of $894,165, which represented $861,000 cash and $33,165 related to the AMOSA loan and accrued interest. In 2015, the Company paid dividends to AZOA of $572,125. (f) Subsidiary Transactions On July 1, 2015, The Annuity Store Financial and Insurance Services (TAS), a wholly-owned subsidiary of the Allianz Individual Insurance Group LLC (AIIG), which is a wholly-owned subsidiary of the Company, purchased a 100% interest in Life Sales, a FMO, from Fireman’s Fund Insurance Company (FFIC), a subsidiary of AZOA, for $2,617. TAS recorded the assets and liabilities of Life Sales at the historical cost recorded by FFIC. An excess of $2,125 was paid over the basis and charged to equity as a dividend paid to AZOA. The dividend paid as the result of the sale is included in the dividend paid to parent listed above. On February 1, 2016, Allegiance Marketing Group, LLC, a wholly-owned subsidiary of AIIG, merged with and into GamePlan Financial Marketing (GamePlan), another wholly-owned subsidiary of AIIG. GamePlan was the surviving entity. On February 2, 2016, GamePlan purchased a 100% interest in an independent FMO for a purchase price of $7,710. GamePlan recorded these assets and liabilities of the entity at fair value. As a result of the purchase, Goodwill in the amount of $4,929 and Intangible assets of $2,872 were recorded in Other assets on the Consolidated Balance Sheets. The intangible assets will be amortized over a period of seven years. During 2017 and 2016 , the Company recorded amortization expense of $410 and $376 for the intangible assets acquired. On November 1, 2016, Roster Financial LLC, a wholly-owned subsidiary of AIIG, merged with and into GamePlan. GamePlan was the surviving entity. AZL PF Investments, Inc. (AZLPF), a wholly-owned subsidiary of the Company, issued redeemable preferred stock as a result of a prepaid forward agreement. AZLPF's Board of Directors approved the redemption of the preferred stock in November 2016. The preferred stock liability and related accrued interest of $32,195 was recorded at December 31, 2016 and was reported in Other liabilities on the Consolidated Balance Sheets. The preferred stock and related accrued interest was mandatorily redeemed on January 9, 2017 for $32,244. On June 30, 2017, Allianz Life and Annuity Company (ALAC), a wholly-owned subsidiary of the Company, was sold to an unrelated third-party. The sale of the subsidiary generated a realized gain of $1,440 which was recorded in Realized investment gains (losses), net in the Consolidated Statements of Operations. ALAC entered into a modified coinsurance reinsurance agreement with the Company effective May 1, 2017. Under the reinsurance agreement, all liabilities and risk associated with ALAC's contractholders were assumed by the Company. On November 1, 2017, 3 Mentors, Inc., a wholly-owned subsidiary of GamePlan, merged with and into GamePlan. GamePlan was the surviving entity. On December 1, 2017, Personalized Brokerage Service, LLC, a wholly-owned subsidiary of AIIG, merged with and into American Financial Marketing, LLC (AFM), another wholly-owned subsidiary of AIIG. AFM was the surviving entity. (g) Reinsurance The Company wholly-owns Allianz Annuity Company of Missouri (AAMO), a special purpose life reinsurance captive insurance company (SPLRC) domiciled in Missouri. Prior to December 2015, the Company ceded to AAMO, and AAMO provided indemnity reinsurance on a combined funds withheld coinsurance and modified coinsurance basis, a 20% quota share of the Company’s net liability of variable annuity policies written directly by the Company starting with 2010 policies for a particular product. The impact of this reinsurance agreement is eliminated through consolidation. In December 2015, the Company recaptured all risks ceded to AAMO under the reinsurance agreement and terminated the reinsurance agreement. Following the recapture and termination, AAMO maintained its license to act as a Missouri SPLRC under Missouri SPLRC Law. Upon recapture, the liabilities were incorporated into the Company’s general account liabilities and the modified coinsurance and funds withheld trust agreements were terminated. As part of the recapture, bonds and IRS were sold by AAMO which generated realized gains of $3,806. After intercompany balances were settled, AAMO paid a dividend to the Company in the amount of $455,843. The Company received approval from the Department of Insurance, Financial Institutions, and Professional Registration of the State of Missouri for all transactions noted above. The Company wholly-owns AZMO, a SPLRC domiciled in Missouri. The Company cedes to AZMO, and AZMO provides reinsurance on a coinsurance basis and modified coinsurance basis, a 100% quota share of the Company’s net liability of level term life insurance policies and certain universal life insurance policies written directly by the Company. A letter of credit was issued under an existing letter of credit facility in which Allianz SE is the applicant and the face amount of the letter of credit is in a qualifying trust established by AZMO. The impact of this reinsurance agreement is eliminated through consolidation. In July 2017, the Company entered into a reinsurance agreement with an affiliate, a wholly-owned subsidiary of Allianz SE. The Company cedes on a combined funds withheld coinsurance and modified coinsurance basis, a 60% quota share of the Company's net liability of certain fixed-indexed annuity policies written directly by the Company. The Company ceded premiums of $429,756 during 2017 . The Company recorded a reinsurance recoverable and modified coinsurance payable of $436,298 and $396,562 as of December 31, 2017 , respectively. The reinsurance recoverable and modified coinsurance payable are included in Reinsurance and investment contract recoverables and Other liabilities on the Consolidated Balance Sheets, respectively. Excluding the reinsurance agreement mentioned above, the Company has reinsurance and investment contract recoverables and payables due to or from reinsurance agreements with other affiliated entities. Total affiliated net reinsurance recoverable was $423 as of December 31, 2017 and is included in Reinsurance and investment contract recoverables on the Consolidated Balance Sheets. Total affiliated net reinsurance payable was $ 79 as of December 31, 2016 , and is included in Other liabilities on the Consolidated Balance Sheets. (h) Line of Credit Agreement The Company has a line of credit agreement with its subsidiary, AZNY, to provide liquidity, as needed. The Company’s lending capacity under the agreement is limited to 5% of the general account admitted assets of AZNY as of the preceding year end. No amounts have been borrowed during the years ended December 31, 2017 and 2016 .

Statutory Financial Data and Di

Statutory Financial Data and Dividend Restrictions	12 Months Ended
	Dec. 31, 2017
Statutory Financial Data and Dividend Restrictions	(20) Statutory Financial Data and Dividend Restrictions Statutory accounting practices prescribed or permitted by the Company’s state of domicile are directed toward insurer solvency and protection of policyholders. Accordingly, certain items recorded in financial statements prepared under GAAP are excluded or vary in calculation in determining statutory policyholders’ surplus and gain from operations. Currently, these items include, among others, DAC, deferred taxes, receivables (which are more than 90 days past due), reinsurance, and certain investments. Additionally, account balances and future policy benefit reserves calculated for statutory reporting do not include provisions for withdrawals. The Company’s statutory capital and surplus reported in the statutory annual statement filed with the State of Minnesota as of December 31, 2017 and 2016 , was $6,011,236 and $6,165,279 , respectively. The Company’s net (loss) gain from operations reported in the statutory annual statement filed with the State of Minnesota for the years end December 31, 2017 and 2016 , was $(2,849,638) and $1,497,192 , respectively. The Company is required to meet minimum statutory capital and surplus requirements. The Company’s statutory capital and surplus as of December 31, 2017 and 2016 , were in compliance with these requirements. The maximum amount of ordinary dividends that can be paid by Minnesota insurance companies to the stockholder without prior approval of the Department is subject to restrictions relating to statutory earned surplus, also known as unassigned funds. Unassigned funds are determined in accordance with the accounting procedures and practices governing preparation of the statutory annual statement. In accordance with Minnesota Statutes, the Company may declare and pay from its Unassigned surplus cash dividends of not more than the greater of 10% of its prior year-end statutory surplus, or the net gain from operations of the insurer, not including realized gains, for the 12-month period ending the 31st day of the next preceding year. Based on these limitations, ordinary dividends of $601,124 can be paid in 2018 without prior approval of the Commissioner of Commerce. Regulatory Risk-Based Capital An insurance enterprise’s state of domicile imposes minimum risk-based capital requirements that were developed by the NAIC. The formulas for determining the amount of risk-based capital specify various weighting factors that are applied to financial balances or various levels of activity based on the perceived degree of risk. Regulatory compliance is determined by a ratio of an enterprise’s regulatory total adjusted capital to its authorized control level risk-based capital, as defined by the NAIC. Companies below specific trigger points or ratios are classified within certain levels, each of which requires specified corrective action. This ratio for the Company significantly exceeds required minimum thresholds as of December 31, 2016 and 2017 .

Capital Structure

Capital Structure	12 Months Ended
	Dec. 31, 2017
Capital Structure	(21) Capital Structure The Company is authorized to issue three types of capital stock, as outlined in the table below: Authorized, issued, and outstanding Par value, per share Redemption rights Voluntary or involuntary liquidation rights Common stock 40,000,000 $1.00 None None 20,000,001 20,000,001 Preferred stock: Class A 200,000,000 $1.00 Designated by Board for each series issued Designated by Board for each series issued 18,903,484 18,903,484 Class A, Series A 8,909,195 $1.00 $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid 8,909,195 8,909,195 Class A, Series B 10,000,000 $1.00 $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid 9,994,289 9,994,289 Class B 400,000,000 $1.00 Designated by Board for each series issued Designated by Board for each series issued 400,000,000 400,000,000 Holders of Class A preferred stock and of common stock are entitled to one vote per share with respect to all matters presented to or subject to the vote of shareholders. Holders of Class B preferred stock have no voting rights. All issued and outstanding shares are owned by AZOA. See note 1 for further discussion. Each share of Class A preferred stock is convertible into one share of the Company’s common stock. The Company may redeem any or all of the Class A preferred stock at any time. Dividends will be paid to each class of stock only when declared by the BOD. In the event a dividend is declared, dividends must be paid to holders of Class A preferred stock, Class B preferred stock, and common stock, each in that order. As discussed in notes 2 and 19, the Company carried out various capital transactions with related parties during 2017 , 2016 , and 2015 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income	(22) Accumulated Other Comprehensive Income Changes in AOCI, net of tax, by component consist of the following at December 31: 2017 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 1,165,665 (19,206 ) 6,923 (104 ) 1,153,278 OCI before reclassifications 1,001,398 1,223 857 (12 ) 1,003,466 Amounts reclassified from AOCI (43,085 ) (9,313 ) — 8 (52,390 ) Net OCI 958,313 (8,090 ) 857 (4 ) 951,076 Ending balance $ 2,123,978 (27,296 ) 7,780 (108 ) 2,104,354 2016 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1)(2) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 472,376 10,408 6,231 (65 ) 488,950 OCI before reclassifications 667,048 (22,227 ) 692 (42 ) 645,471 Amounts reclassified from AOCI 26,241 (7,387 ) — 3 18,857 Net OCI 693,289 (29,614 ) 692 (39 ) 664,328 Ending balance $ 1,165,665 (19,206 ) 6,923 (104 ) 1,153,278 2015 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1)(2) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 1,765,606 1,475 10,240 (176 ) 1,777,145 OCI before reclassifications (1,263,867 ) 12,311 (4,009 ) 95 (1,255,470 ) Amounts reclassified from AOCI (29,363 ) (3,378 ) — 16 (32,725 ) Net OCI (1,293,230 ) 8,933 (4,009 ) 111 (1,288,195 ) Ending balance $ 472,376 10,408 6,231 (65 ) 488,950 (1) Includes cumulative foreign currency translation losses on the hedged items of $18,704, $79,727, and $27,168 at December 31, 2017, 2016, and 2015, respectively. (2) The previously issued 2016 Consolidated Financial Statements improperly disclosed OCI before reclassifications as $(29,614) and $8,933 for the years ended December 31, 2016 and 2015, respectively. OCI before reclassifications previously included amounts that were reclassified from AOCI of $(7,387) and $(3,378) for the years ended December 31, 2016 and 2015, respectively. The December 31, 2016 and 2015 amounts have been corrected to conform with current year presentation. Reclassifications from AOCI, net of tax, consist of the following : Amounts reclassified from AOCI Affected line item December 31, in the Consolidated AOCI 2017 2016 2015 Statements of Operations Net unrealized gain (loss) on securities: Available-for-sale securities $ 66,284 (40,370 ) 45,174 Realized investment gains (losses), net Income tax expense (benefit) 23,199 (14,129 ) 15,811 Income tax expense (benefit) Total 43,085 (26,241 ) 29,363 Net gain on cash flow hedging: Effective portion of gains 13,622 11,121 5,197 Interest and similar income, net Ineffective portion of gains 706 243 — Change in fair value of assets and liabilities Income tax expense (benefit) 5,015 3,977 1,819 Income tax expense (benefit) Total 9,313 7,387 3,378 Pension and other postretirement plan adjustments: Amortization of actuarial losses (12 ) (5 ) (25 ) General and administrative expenses Income tax expense (benefit) (4 ) (2 ) (9 ) Income tax expense (benefit) Total (8 ) (3 ) (16 ) Total amounts reclassified from AOCI $ 52,390 (18,857 ) 32,725 Net income

Foreign Currency Translation

Foreign Currency Translation	12 Months Ended
	Dec. 31, 2017
Foreign Currency Translation	(23) Foreign Currency Translation An analysis of foreign currency translation, net of tax for the respective years ended December 31 is as follows: 2017 2016 2015 Beginning amount of cumulative translation adjustments $ 6,923 6,231 10,240 Aggregate adjustment for the period resulting from translation adjustments 1,318 1,065 (6,168 ) Amount of income tax expense for the period related to aggregate adjustment (461 ) (373 ) 2,159 Net aggregate translation included in equity 857 692 (4,009 ) Ending amount of cumulative translation adjustments $ 7,780 6,923 6,231 Canadian dollar to United States dollar foreign exchange rate at end of year 0.79812 0.74568 0.71989

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Information	(24) Segment Information The Company has organized its principal operations into the following segments: Individual Annuities, Life, Questar, and Legacy. The Individual Annuities segment consists of fixed, fixed-indexed, variable, and variable-indexed annuities that are provided through independent distribution channels made up of agents and registered representatives. Revenues for the Company’s fixed annuity products are primarily earned as net investment income on invested assets supporting fixed account balances, with profitability driven by the spread between net investment income earned and interest credited to account balances. Revenues for the Company’s variable annuity products are primarily earned as management and expense fees charged on underlying account balances. The Life segment issues fixed-indexed universal life insurance products, as well as maintains term and whole life in-force blocks that the Company no longer sells or distributes. The primary sources for revenue for this segment are premiums, fees, and charges that the Company receives to assume insurance related risk, in addition to earning a spread on net investment income on invested assets. The Questar segment consists of two wholly-owned subsidiaries, Questar Capital Corporation (Questar Capital) and Questar Asset Management, Inc. (QAM). Questar Capital is registered as a broker-dealer under the Securities Exchange Act of 1934 and operates as a retail broker-dealer. Questar Capital distributes a full range of securities products, including mutual funds, variable life insurance, and annuity contracts. Questar Capital also processes general securities transactions through a clearing arrangement with a third-party provider. QAM provides portfolio management for clients and revenue is driven by fees received based on assets under management. The Legacy business consists of closed blocks of LTC and Special Markets products. The Special Markets products include individual and group annuity and life products, including universal life and term life insurance. Although Legacy products are part of the consolidated results, the Company does not allocate additional resources to these areas other than to maintain the operational support to its current customers. The Company does not maintain segregated investment portfolios for each segment. All Interest and similar income, net and Realized investment (losses) gains, net are allocated to the segments. Assets are only monitored at the individual company level, and as such, asset disclosures by segment are not included herein. Income and expense related to assets backing policyholder reserves are allocated to the segments based on policyholder reserve levels. The results of the Individual Annuity, Life, and Legacy segments also reflect allocation of income and expense related to assets backing surplus. Income and expense related to assets backing surplus are allocated to the segments based on required capital levels for each segment and are excluded from EGP used in calculating reserves and DAC. Unconsolidated segment results are reconciled to the Consolidated Statements of Operations amounts in the tables below: Year ended December 31, 2017 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,249,793 204,920 — 150,514 — 1,605,227 Interest and similar income, net 4,301,602 135,346 68 85,203 — 4,522,219 Change in fair value of assets and liabilities 3,368,121 233,840 2 505 — 3,602,468 Realized investment gains (losses), net 80,111 2,272 3 1,236 — 83,622 Fee, commission, and other revenue 249,280 1,485 110,989 1,380 (38,404 ) 324,730 Total revenue 9,248,907 577,863 111,062 238,838 (38,404 ) 10,138,266 Benefits and expenses: Net benefits and expenses 6,570,915 350,354 — 207,970 — 7,129,239 General and administrative and commission 1,486,314 219,519 122,989 21,726 (38,404 ) 1,812,144 Change in deferred acquisition costs, net 313,504 (59,168 ) — 20,027 — 274,363 Total benefits and expenses 8,370,733 510,705 122,989 249,723 (38,404 ) 9,215,746 Pretax income (loss) $ 878,174 67,158 (11,927 ) (10,885 ) — 922,520 Year ended December 31, 2016 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,117,580 147,013 — 142,686 — 1,407,279 Interest and similar income, net 4,133,359 113,465 32 78,881 — 4,325,737 Change in fair value of assets and liabilities (218,922 ) 40,600 2 82 — (178,238 ) Realized investment gains (losses), net (49,126 ) 623 — (822 ) — (49,325 ) Fee, commission, and other revenue 243,789 747 101,432 1,191 (37,305 ) 309,854 Total revenue 5,226,680 302,448 101,466 222,018 (37,305 ) 5,815,307 Benefits and expenses: Net benefits and expenses 1,982,879 194,667 — 205,632 — 2,383,178 General and administrative and commission 1,774,740 159,455 114,009 18,489 (37,305 ) 2,029,388 Change in deferred acquisition costs, net 315,760 (69,477 ) — 13,124 — 259,407 Total benefits and expenses 4,073,379 284,645 114,009 237,245 (37,305 ) 4,671,973 Pretax income (loss) $ 1,153,301 17,803 (12,543 ) (15,227 ) — 1,143,334 Year ended December 31, 2015 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,133,285 172,660 — 143,646 — 1,449,591 Interest and similar income, net 3,999,693 103,326 3 72,447 — 4,175,469 Change in fair value of assets and liabilities (492,479 ) (38,553 ) — (1,688 ) — (532,720 ) Realized investment gains (losses), net 90,948 1,597 — 1,868 — 94,413 Fee, commission, and other revenue 236,454 186 105,830 253 (39,324 ) 303,399 Total revenue 4,967,901 239,216 105,833 216,526 (39,324 ) 5,490,152 Benefits and expenses: Net benefits and expenses 2,296,057 114,377 — 192,660 — 2,603,094 General and administrative and commission 1,549,692 165,386 110,624 18,059 (39,324 ) 1,804,437 Change in deferred acquisition costs, net 279,582 (53,642 ) — 13,319 — 239,259 Total benefits and expenses 4,125,331 226,121 110,624 224,038 (39,324 ) 4,646,790 Pretax income (loss) $ 842,570 13,095 (4,791 ) (7,512 ) — 843,362

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events	(25) Subsequent Events No material subsequent events have occurred since December 31, 2017 through March 29, 2018 , the date at which the financial statements were issued, that would require adjustment to the financial statements. On January 22, 2018, the Company formed TruChoice Financial Group, LLC (TruChoice), a noninsurance subsidiary. TruChoice is a wholly-owned subsidiary of AIIG and was capitalized through an initial cash contribution of $1,716 from AIIG. In addition, AIIG contributed 100% of the membership interests it held in the following FMOs: AFM, GamePlan, TAS, and Ann Arbor Annuity Exchange, LLC, in exchange for 100% of the membership interest of TruChoice.

Summary of Investments - Other

Summary of Investments - Other than Investments in Related Parties	12 Months Ended
	Dec. 31, 2017
Summary of Investments - Other than Investments in Related Parties	Amount at which shown in the Consolidated Balance Sheets Fixed-maturity securities: Fixed-maturity securities, available-for-sale: U.S. government $ 2,449,361 2,441,454 2,441,454 Agencies not backed by the full faith and credit of the U.S. government 6,692 6,817 6,817 States and political subdivisions 10,177,673 11,317,726 11,317,726 Foreign government 523,356 540,613 540,613 Corporate securities 65,145,715 70,045,273 70,045,273 Mortgage-backed securities 14,297,121 14,425,840 14,425,840 CDO 15,243 27,565 27,565 Total fixed-maturity securities, available-for-sale 92,615,161 98,805,288 98,805,288 Fixed-maturity securities, trading: U.S. government 30,578 30,901 30,901 Agencies not backed by the full faith and credit of the U.S. government 5,254 5,168 5,168 Corporate securities 150 150 150 Total fixed-maturity securities, trading 35,982 36,219 36,219 Total fixed-maturity securities 92,651,143 98,841,507 98,841,507 Equity securities: Equity securities, available-for-sale: Common stocks: Industrial and miscellaneous 259,573 270,409 270,409 Preferred stocks: Industrial and miscellaneous 1,500 1,500 1,500 Total equity securities, available-for-sale 261,073 271,909 271,909 Equity securities, fair value option and trading: Common stocks: Industrial and miscellaneous 289,217 314,370 314,370 Total equity securities, fair value option and trading 289,217 314,370 314,370 Total equity securities 550,290 586,279 586,279 Other investments: Mortgage loans on real estate, net 11,761,939 12,372,775 11,761,939 Derivative assets 1,388,190 1,388,190 1,388,190 Loans to affiliates 39,120 39,120 39,120 Policy loans 184,409 184,409 184,409 Other invested assets 382,154 382,154 382,154 Total other investments 13,755,812 14,366,648 13,755,812 Total investments $ 106,957,245 113,794,434 113,183,598 (1) The original cost of equity securities and other investments is reduced by impairments. The original cost of fixed-maturity securities is reduced by repayments and impairments adjusted for amortization of premiums and accrual discounts.

Supplementary Insurance Informa

Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2017
Supplementary Insurance Information	As of December 31 Year ended December 31 Deferred acquisition costs Deferred sales inducements (1) Account balances and future policy reserves Unearned premiums Policy and contract claims Net premium and policy fees Interest and similar income, net Net benefits (2) Net change in deferred sale inducements (3) Net change in deferred acquisition costs (4) Other operating expenses 2017: Annuities $ 3,352,997 431,318 107,307,376 117 — 1,249,793 4,301,602 6,402,287 168,628 313,504 1,447,911 Life 499,742 — 3,930,018 35,824 3,121 204,920 135,346 349,186 1,168 (59,168 ) 219,519 Questar — — — — — — 68 — — — 122,990 Legacy (1,899 ) — 4,536,762 62,331 693,576 150,514 85,203 207,970 — 20,027 21,724 $ 3,850,840 431,318 115,774,156 98,272 696,697 1,605,227 4,522,219 6,959,443 169,796 274,363 1,812,144 2016: Annuities $ 4,704,646 763,386 97,927,975 5,864 1,731 1,117,580 4,133,359 1,763,154 219,725 315,760 1,737,434 Life 523,701 1,168 3,172,139 77,790 4,438 147,013 113,465 194,521 146 (69,477 ) 159,455 Questar — — — — — — 32 — — — 114,009 Legacy 17,996 — 4,254,346 61,681 614,574 142,686 78,881 205,632 — 13,124 18,490 $ 5,246,343 764,554 105,354,460 145,335 620,743 1,407,279 4,325,737 2,163,307 219,871 259,407 2,029,388 2015: Annuities $ 5,766,176 1,108,877 90,734,164 25,620 — 1,133,285 3,999,693 2,095,788 200,269 279,582 1,510,369 Life 486,195 1,315 2,678,431 70,621 3,335 172,660 103,326 112,236 2,141 (53,642 ) 165,385 Questar — — — — — — 3 — — — 110,624 Legacy 30,865 — 3,901,902 57,875 514,590 143,646 72,447 192,660 — 13,319 18,059 $ 6,283,236 1,110,192 97,314,497 154,116 517,925 1,449,591 4,175,469 2,400,684 202,410 239,259 1,804,437 (1) Deferred sales inducements is located in Other assets on the Consolidated Balance Sheets. (2) Excludes net change in deferred sales inducements. (3) See note 10 for aggregate gross amortization of deferred sales inducements. (4) See note 9 for aggregate gross amortization of deferred acquisition costs.

Reinsurance35

Reinsurance	12 Months Ended
	Dec. 31, 2017
Reinsurance	Years ended Direct amount Ceded to other companies Assumed from other companies Net Amount Percentage of amount assumed to net December 31, 2017: Life insurance face amount in force $ 37,365,340 24,877,754 48,647 12,536,233 0.4 % Premiums and policy fees: Life $ 275,152 68,432 686 207,406 0.3 % Annuities 1,229,815 (18,268 ) (402 ) 1,247,681 — Accident and health 182,351 76,260 44,049 150,140 29.3 Total premiums and policy fees $ 1,687,318 126,424 44,333 1,605,227 2.8 % December 31, 2016: Life insurance face amount in force $ 33,748,978 23,377,514 23,086 10,394,550 0.2 % Premiums and policy fees: Life $ 207,771 59,071 746 149,446 0.5 % Annuities 1,111,894 (4,514 ) (425 ) 1,115,983 — Accident and health 184,915 78,426 35,361 141,850 24.9 Total premiums and policy fees $ 1,504,580 132,983 35,682 1,407,279 2.5 % December 31, 2015: Life insurance face amount in force $ 30,774,840 21,809,292 60,469 9,026,017 0.7 % Premiums and policy fees: Life $ 219,959 45,746 683 174,896 0.4 % Annuities 1,130,514 (1,447 ) (442 ) 1,131,519 — Accident and health 188,885 80,987 35,278 143,176 24.6 Total premiums and policy fees $ 1,539,358 125,286 35,519 1,449,591 2.5 % The Life and Annuities categories above are prescribed splits based on product and will differ from the results of the Life and Individual Annuity segments.

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Basis of Presentation	(a) Basis of Presentation The Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The accounts of the Company’s primary subsidiary, Allianz Life Insurance Company of New York (AZNY), and all other subsidiaries have been consolidated. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	(b) Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect reported amounts of assets and liabilities, including reporting or disclosure of contingent assets and liabilities as of December 31, 2017 and 2016 , and the reported amounts of revenues and expenses during the reporting period. Future events, including changes in mortality, morbidity, interest rates, capital markets, and asset valuations could cause actual results to differ from the estimates used within the Consolidated Financial Statements. Such changes in estimates are recorded in the period they are determined.
Investment Products and Universal Life Business	(c) Investment Products and Universal Life Business Investment products consist primarily of fixed and variable annuity products. Premium receipts are reported as deposits to the contractholders’ accounts or an establishment of future policy benefit reserves. Premiums and policy fees, net in the Consolidated Statements of Operations represent asset fees, cost of insurance charges, administrative fees, charges for guarantees on investment products, and surrender charges for investment products and universal life insurance, all of which is net of reinsurance. These fees have been earned and assessed against contractholders on a daily or monthly basis throughout the contract period and are recognized as revenue when assessed and earned. Amounts assessed that represent compensation to the Company for services to be provided in future periods are not earned in the period assessed. Such amounts are reported as unearned revenue, which include unearned revenue reserves (URR), and are recognized in operations over the period benefited using the same assumptions and factors used to amortize capitalized acquisition costs. Unearned revenue is reported in Unearned premiums on the Consolidated Balance Sheets. Surrender charges are recognized upon surrender of a contract in accordance with contractual terms. Derivatives embedded in fixed-indexed, variable, and certain life products are recorded at fair value and changes in value are included in Change in fair value of annuity and life embedded derivatives in the Consolidated Statements of Operations. Benefits consist of interest credited to contractholders’ accounts and claims incurred in excess of the contractholders’ account balance, net of reinsurance, and are included in Net interest credited to account values and Policyholder benefits, net of recoveries, respectively, within the Consolidated Statements of Operations. The Company offers a variable-indexed annuity product that combines a separate account option with a general account option that is similar to a fixed-indexed annuity. The Company has elected the fair value option to account for the entire insurance contract liability and the variable investment option assets in the separate account. The insurance contracts’ reserves are reported in Account balances and future policy benefit reserves and the variable investment option assets within the separate account are reported in Equity securities, fair value option and trading on the Consolidated Balance Sheets. Assets backing the general account are primarily reported in Fixed-maturity securities, available-for-sale on the Consolidated Balance Sheets. Electing the fair value option for an insurance contract liability requires that the Company account for that liability as a financial instrument at fair value through profit and loss and also requires that acquisition costs be recognized immediately in expense. See note 6 for further details regarding the valuation methodology of the variable-indexed annuity product.
Life and Accident and Health Insurance	(d) Life and Accident and Health Insurance Premiums on traditional life products are recognized as revenue over the premium-paying periods of the contracts when due from contractholders. Premium revenue generally exceeds expected policy benefits in the early years of the contracts and a reserve liability is established for costs and benefits that are expected to be paid in the later years of the contracts. Accident and health premiums are recognized as earned on a pro rata basis over the risk coverage periods. Benefits and expenses are recognized as incurred.
Investments	(e) Investments Fixed-Maturity Securities and Equity Securities The Company has portfolios of fixed-maturity securities and equity securities classified as “available-for-sale.” Accordingly, these securities are carried at fair value, and related unrealized gains and losses are credited or charged directly to accumulated other comprehensive income (AOCI) in stockholder’s equity, net of tax and related shadow adjustments. The adjustments to deferred acquisition costs (DAC) , value of business acquired (VOBA), and deferred sale inducements (DSI) represent the change in amortization that would have been required as a charge or credit to operations had such unrealized amounts been realized. The adjustment to reserves represents the increase or decrease in the reserve balance that would have been required as a charge or credit to operations had such unrealized amounts been realized. Included in the Company’s portfolios of fixed-maturity securities classified as “available-for-sale” are fixed-maturity securities acquired with deteriorated credit quality. On a quarterly basis, the Company estimates the future cash flows for these securities and records any changes as adjustments to accretable yield. Accretable yield refers to the amount of undiscounted cash flows expected in excess of the carrying amount. This amount is converted into a rate and accreted into Interest and similar income, net in the Consolidated Statements of Operations. Interest is recorded as received on certain securities acquired that do not have reasonably estimable cash flows. If, subsequently, it is probable that there is a significant change in cash flows expected to be collected or if actual cash flows are significantly greater than cash flows previously expected to be collected, the effective yield is recalculated prospectively. The Company has portfolios of certain fixed-maturity securities and equity securities classified as “trading”. These securities are carried at fair value, and related unrealized and realized gains and losses are reflected in Change in fair value of assets and liabilities within the Consolidated Statements of Operations. Additionally, the Company has a portfolio of mutual fund seed money investments and restricted stock units (RSU) for which the fair value option was elected and is included within Equity securities, fair value option and trading on the Consolidated Balance Sheets. The fair value option was elected for the mutual fund seed money investments because the portfolio is managed based on the fair values and ultimately sold to other investors at fair value. For RSU, the fair value option was elected as RSU are tied to the share price of Allianz SE stock, which constitutes a fair value, and more accurately reflects the underlying obligation owed to certain employees. In addition, the Company had portfolios of certain fixed-maturity securities classified as “held-to-maturity” carried at amortized cost on the Consolidated Balance Sheets as of December 31, 2016. During 2017, the Company sold one portfolio of held-to-maturity fixed-maturity securities for which the Company had collected a substantial portion of the principal outstanding and the remaining portfolio of held-to-maturity fixed-maturities matured. Dividends are accrued on the date they are declared and interest is accrued as earned. Premiums or discounts on fixed-maturity securities are amortized using the constant yield method. Realized gains and losses are computed based on the average amortized cost basis of all lots owned of each security. The Company has portfolios of structured securities which include mortgage-backed securities, collateralized debt obligations (CDO), collateralized loan obligations (CLO), and other asset-backed securities. Mortgage-backed securities and CDO are presented separately while CLO and other asset-backed securities are included within 'Corporate securities' within the Notes to the Consolidated Financial Statements. Structured securities are amortized using, among other assumptions, anticipated prepayments. Prepayment assumptions for structured securities are obtained from various external sources or internal estimates. The Company believes these assumptions are consistent with those a market participant would use. The Company recognizes income using a constant effective yield method based on prepayment assumptions and the estimated economic life of the securities. For all structured securities without expected credit deterioration, when actual prepayments differ significantly from anticipated prepayments, the effective yield is recalculated to reflect actual payments to date and anticipated future payments retrospectively. Any resulting adjustment is included in Interest and similar income, net in the Consolidated Statements of Operations. For structured securities with expected credit deterioration, when adjustments are made to assumptions for prepayments and other future cash flows, the effective yield is recalculated prospectively. The fair value of fixed-maturity securities and equity securities is obtained from third-party pricing sources whenever possible. Management completes its own independent price verification (IPV) process, which ensures security pricing is obtained from a third-party source other than the sources used by the Company's internal and external investment managers. The IPV process supports the reasonableness of price overrides and challenges by the internal and external investment managers and reviews pricing for appropriateness. Results of the IPV process are reviewed by the Company’s Pricing Committee. The Company reviews the available-for-sale and held-to-maturity fixed-maturity investment portfolios to determine whether or not declines in fair value are other-than-temporary. In addition, the Company continually evaluates average amortized cost, fair value, credit quality, extent and duration of the decline, market analysis, current events, recent price declines, changes in risk-free interest rates, and likelihood of recovery in a reasonable period of time. Based on this evaluation, the Company determines whether fixed-income securities are considered other-than-temporarily impaired. When the fair value of a fixed-maturity security is less than its amortized cost, the Company assesses whether or not (i) it has the intent to sell the security or (ii) it is more likely than not that the Company will be required to sell the security before its anticipated recovery. The Company evaluates these factors to determine whether the Company or any of its internal and external investment managers have the intent to sell a security or a group of securities. The Company performs a cash flow projection for several years into the future to determine whether cash needs would require the sale of any securities in an unrealized loss position. If either of these conditions are met, the Company must recognize an other-than-temporary impairment (OTTI) for the difference between the investment’s amortized cost basis and its fair value through earnings. For securities that do not meet the above criteria and the Company does not expect to recover a security’s amortized cost basis, the security is also considered other-than-temporarily impaired. For these securities, the Company separates the total impairment into the credit loss component and the amount of the loss related to other factors. The amount of the total impairment related to credit loss is considered an OTTI and is recognized in Realized investment gains (losses), net in the Consolidated Statements of Operations. The amount of the total impairment related to other factors is recognized in other comprehensive income (OCI), net of impacts to DAC, DSI, VOBA, reserves, and deferred income taxes. For available-for-sale and held-to-maturity securities that have recognized an OTTI through earnings, if through subsequent evaluation there is a significant increase in the cash flow expected, the difference between the amortized cost basis and the discounted cash flows expected to be collected is accreted as interest income. Subsequent increases and decreases not related to additional credit losses in the fair value of available-for-sale securities are included in the Consolidated Statements of Comprehensive Income (Loss). The Company evaluates whether a credit loss exists by considering primarily the following factors: (a) the length of time and extent to which the fair value has been less than the amortized cost of the security; (b) changes in the financial condition, credit rating, and near-term prospects of the issuer; (c) whether the issuer is current on contractually obligated interest and principal payments; (d) changes in the financial condition of the security’s underlying collateral, if any; and (e) the payment structure of the security . The Company uses a probability-weighted cash flow model for fixed-maturity securities to determine the credit loss amount. This measurement is a quantitative and qualitative process that incorporates information received from third-party sources along with certain internal assumptions and significant judgments regarding the future performance of the security. The Company’s probability-weighted cash flow model involves assumptions including, but not limited to, various performance indicators, such as historical and projected default and recovery rates, credit ratings, and current delinquency rates. The Company provides a supplemental disclosure within the Consolidated Statements of Operations that presents the total OTTI losses recognized in earnings during the period. The supplemental disclosure excludes subsequent increases and decrease in the fair value of these securities. The Company evaluates whether equity securities are other-than-temporarily impaired through a review process which includes, but is not limited to, market analysis, analyzing current events, assessing recent price declines, and management’s judgment related to the likelihood of recovery within a reasonable period of time. Impairments in the value of securities held by the Company considered to be other-than-temporary are recorded as a reduction of the cost of the security, and a corresponding realized loss is recognized in the Consolidated Statements of Operations. The Company adjusts DAC , VOBA, and DSI for impairments on securities, as discussed in their respective sections of this note. Mortgage Loans on Real Estate Mortgage loans on real estate are reflected at unpaid principal balances adjusted for an allowance for uncollectible balances. Interest on mortgage loans is accrued on a monthly basis and recorded in Interest and similar income, net in the Consolidated Statements of Operations. The Company analyzes loan impairment quarterly when assessing the adequacy of the allowance for uncollectible balances. The Company considers recent trends in the Company’s loan portfolio and information on current loans, such as loan-to-value ratios and debt service coverage, which could impact a loan’s credit quality. The Company also evaluates the allowance for uncollectible balances to ensure that the estimate is based on appropriate market assumptions to reflect default and loss rates. The Company does not accrue interest on delinquent loans. When the Company discontinues accruing interest on delinquent loans, interest is recorded on a cash basis. The Company will begin accruing interest again on a loan once all delinquent interest and principal payments are brought current. Loans to Affiliates The Company has a note receivable from a related party and has recorded it in Loans to affiliates on the Consolidated Balance Sheets. Loans to affiliate are carried at amortized cost on the Consolidated Balance Sheets and interest is accrued on a monthly basis. Interest payments are received annually. Policy Loans Policy loans are supported by the underlying cash value of the policies. Policy loans are carried at unpaid principal balances plus accrued interest income on the Consolidated Balance Sheets. Other Invested Assets Other invested assets include short-term securities, loans to non-affiliates, equity securities carried at cost, investments in limited partnerships, and investments in limited liability companies. Short-term securities are comprised of fixed-maturity securities with an original maturity of twelve months or less and greater than three months when purchased. Short-term securities are carried at amortized cost, which approximates fair value due to their short-term nature. Loans to non-affiliates are carried at amortized cost, and interest is accrued monthly. The Company invests in low income housing limited partnerships and limited liability companies (LIH investments) for tax benefits. The LIH investments are carried at cost, adjusted for amortization based on the proportion of total tax credits and other tax benefits expected to be received over the life of the investments . The investments in the LIH investments were $63,407 and $46,727 as of December 31, 2017 and 2016 , respectively. The LIH investments are individually evaluated for impairment based on the recoverability of each investment's amortized cost. The Company records a liability and corresponding asset for the discounted future commitment, which decreases as the Company provides capital to fund . The tax benefit is recognized within Income tax expense in the Consolidated Statements of Operations. The Company has recognized tax credits related to the LIH investments of $13,651 , $7,125 , and $2,793 for the years ended December 31, 2017 and 2016 , and 2015 , respectively. Investments in limited partnerships and limited liability companies (other than LIH investments) are accounted for using the equity method of accounting. Undistributed limited partnership and limited liability company profits and losses are recorded in Interest and similar income, net in the Consolidated Statements of Operations. Distributions in excess of cost and impairments of investments in limited partnerships and limited liability companies are recognized within Realized investment gains (losses), net in the Consolidated Statements of Operations. Investments in limited partnerships and limited liability companies are individually evaluated for impairment based upon the recoverability of the each investment's cost. The Company is a member of the Federal Home Loan Bank of Des Moines (FHLB), primarily for the purpose of participating in the FHLB’s mortgage collateralized loan advance program with short-term and long-term funding facilities. Members are required to purchase and hold a minimum amount of FHLB capital stock plus additional stock based on outstanding advances. The equity security investment is carried at cost, which approximates fair value, and is reported in Other invested assets on the Consolidated Balance Sheets. The Company held FHLB stock of $30,000 at December 31, 2017 and 2016 . Advances are in the form of short-term or long-term notes or funding agreements issued to FHLB. Advances received from FHLB are recorded in Account balances and future policy benefit reserves on the Consolidated Balance Sheets. The investment is evaluated for impairment based on the ultimate recoverability of its par value. The Company has a fully collateralized funding agreement with a balance of $500,000 at December 31, 2017 and 2016 . In 2015, the Company obtained a cash advance from FHLB which had a balance of $500,000 as of December 31, 2015. The cash advance was recorded in Other liabilities on the Consolidated Balance Sheets and was subsequently paid off in 2016. Variable Interest Entities In the normal course of business, the Company enters into relationships with various entities that are deemed to be variable interest entities. A variable interest entity (VIE) is an entity that either (1) has equity investors that lack certain essential characteristics of a controlling financial interest (including the ability to control activities of the entity, the obligation to absorb the entity’s expected losses, and the right to receive the entity’s expected residual returns) or (2) lacks sufficient equity to finance its own activities without financial support provided by other entities, which in turn would be expected to absorb at least some of the expected losses of the VIE. The Company consolidates a VIE if it is determined to be the primary beneficiary. Those entities which do not meet the requirements to be a VIE are voting interest entities (VOEs). The Company consolidates a VOE if it holds a voting interest that is greater than 50%.
Derivatives	(f) Derivatives The Company utilizes derivatives within certain actively managed investment portfolios. Within these portfolios, derivatives can be used for hedging, replication, and income generation only. The financial instruments are carried at fair value and the unrealized gains and losses are reflected in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Hedge Accounting To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating changes in the cash flows or fair value of the hedged item due to the designated risk hedged. The documentation process involves defining the Company’s risk management objective, strategy for undertaking each hedge transaction, linking specific derivatives to specific assets or liabilities on the Consolidated Balance Sheets, and defining the effectiveness testing methods to be used. The Company also formally assesses, at inception and on a quarterly basis, whether the derivatives used in hedging transactions have been and are expected to continue to be highly effective in offsetting changes in the cash flows or fair value of hedged items based on the designated risk hedged. Hedge effectiveness is assessed on a prospective and retrospective basis using quantitative methods. Since the inception of the hedge accounting program, on both a prospective and retrospective basis, changes in the cash flows or fair value of the hedging instrument are expected to offset the changes in the cash flows of the hedged item as the key terms match for both instruments. The cumulative effective amount of unrealized gains and losses of the hedging instrument is recognized in AOCI, net of tax on the Consolidated Balance Sheets. The ineffective portion of the change in the fair value of the hedging instrument is recognized in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Foreign Currency Swaps The Company utilizes foreign currency swaps to hedge cash flows and applies hedge accounting treatment. Specifically, the Company uses foreign currency swaps to hedge foreign currency and interest rate fluctuations on certain underlying foreign currency denominated fixed-maturity securities. The foreign currency swaps are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets. The fair value of the foreign currency swaps are derived using a third-party vendor software program and deemed by management to be reasonable. Interest income generated from the foreign currency swaps is recorded in Interest and similar income, net in the Consolidated Statements of Operations. The Company has a timing difference between the purchase of the foreign currency swap and settlement of the hedged foreign currency denominated fixed-maturity security. Any changes in value of the foreign currency swap between the purchase and settlement date are recorded in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. After the hedged foreign currency denominated fixed-maturity security is settled, the Company completes documentation and designates hedge accounting. Nonqualifying hedging Futures and Options Contracts The Company provides benefits through certain life and annuity products which are linked to the fluctuation of various market indices, and certain variable annuity contracts that provide minimum guaranteed benefits. The Company has analyzed the characteristics of these benefits and has entered into over-the-counter (OTC) option contracts , exchange-traded option (ETO) contracts , and exchange-traded futures contracts tied to an underlying index with similar characteristics with the objective to economically hedge these benefits. In addition, the Company uses futures contracts to hedge the investment risk associated with seed money. Management monitors in-force amounts and option and futures contract values to ensure satisfactory matching and to identify unsatisfactory mismatches. If actual persistency deviated, management would purchase or sell option and futures contracts as deemed appropriate or take other actions. The OTC option contracts and ETO contracts are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets. The fair value of the OTC options is derived internally and deemed by management to be reasonable via performing an IPV process. The process of deriving internal derivative prices requires the Company to calibrate Monte Carlo scenarios to actual market information. The calibrated scenarios are applied to derivative cash flow models to calculate fair value prices for the derivatives. The fair value of the ETO contacts is based on quoted market prices. Changes in unrealized gains and losses on the OTC option contracts and ETO contracts and incremental gains and losses from expiring contracts are recorded within Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Futures contracts do not require an initial cash outlay, and the Company has agreed to daily net settlement based on movements of the representative index. Therefore, no asset or liability is recorded on the Consolidated Balance Sheets. Gains and/or losses on futures contracts are included in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Interest Rate Swaps, Credit Default Swaps, Total Return Swaps, and To Be Announced Securities The Company utilizes interest rate swaps (IRS), credit default swaps (CDS), total return swaps (TRS), and To Be Announced (TBA) securities , which do not meet the regular-way security trade scope exception , to economically hedge market risks embedded in certain life and annuity products . The IRS, CDS, TRS, and TBA securities are reported at fair value in Derivative assets and Derivative liabilities on the Consolidated Balance Sheets . The fair value of the IRS, CDS, and TBA securities are derived using a third-party vendor software program and deemed by management to be reasonable. Centrally cleared IRS fair values are obtained from the exchange on which they are traded. The fair value of the TRS is based on counterparty pricing and deemed by management to be reasonable. The unrealized gains and losses as well as investment income and expenses on these derivatives are recorded in Change in fair value of assets and liabilities in the Consolidated Statements of Operations. Stock Appreciation Rights The Company enters into contracts with Allianz SE with the objective to economically hedge risk associated with the Allianz SE stock-based compensation plan, which awards certain employees stock appreciation rights (SAR). The contracts are recorded at fair value within Derivative assets on the Consolidated Balance Sheets. The change in fair value for SAR are recorded in Change in fair value of assets and liabilities and General and administrative expenses within the Consolidated Statements of Operations, respectively. See further discussion of the stock-based compensation plan in note 18.
Cash and Cash Equivalents	(g) Cash and Cash Equivalents Cash and cash equivalents include cash on hand, demand deposits, short-term government money market funds, overnight commercial paper, overnight reverse repurchase agreements, and highly liquid debt instruments purchased with an original maturity of three months or less. In the normal course of business, the Company enters into overnight bilateral and tri-party reverse repurchase agreements, whereby the Company purchases securities and simultaneously agrees to resell the same securities at a stated price on a specified date in the future, for the purpose of earning a specified rate of return. An affiliate of the Company serves as the agent in the bilateral agreements and an unaffiliated bank serves as the custodian in the tri-party agreements. The bilateral agreements require purchases of specifically identified securities. If at any time the fair value of those purchased securities falls below the purchase price, additional collateral in the form of cash or additional securities is required to be transferred to ensure margin maintenance. The tri-party agreements allow for the purchase of certain bonds and structured securities, and require a minimum of 102% of fair value of the securities purchased to be maintained as collateral. Due to the short-term nature of these investments, the carrying value is deemed to approximate fair value.
Securities Lending	(h) Securities Lending The Company participates in securities lending arrangements whereby specific securities are loaned to other institutions. The Company receives collateral from these arrangements including cash and cash equivalents, which can be reinvested based on the Company's discretion, and noncash collateral, which may not be sold or re-pledged unless the counterparty is in default. The Company accounts for its securities lending transactions as secured borrowings, in which the cash collateral received and the related obligation to return the cash collateral are recorded on the Consolidated Balance Sheets as Collateral held from securities lending agreements and Other liabilities, respectively. Noncash collateral received is not reflected on the Consolidated Balance Sheets. Securities on loan remain on the Consolidated Balance Sheets as Fixed-maturity securities, available-for-sale, and interest income earned by the Company on loaned securities is recognized in Interest and similar income, net in the Consolidated Statements of Operations. Company policy requires a minimum of 102% of fair value of securities loaned under securities lending agreements to be maintained as collateral.
Receivables	(i) Receivables Receivable balances (contractual amount less allowance for doubtful accounts) are based on pertinent information available to management as of year-end, including the financial condition and creditworthiness of the parties underlying the receivables. Receivable balances are monitored and the allowance for doubtful accounts is maintained based on the nature of the receivables, and the Company’s assessment of the ability to collect . The allowance is estimated by aging the balances due from individual parties and generally setting up an allowance for any balances that are more than 90 days old.
Reinsurance	(j) Reinsurance The Company assumes and cedes business with other insurers. Reinsurance premium and benefits paid or provided are accounted for in a manner consistent with the basis used in accounting for original policies issued and the terms of the reinsurance contracts and are included in Premiums and policy fees, net, and Policyholder benefits, net of recoveries, respectively, in the Consolidated Statements of Operations. Insurance liabilities are reported before the effects of reinsurance. Account balances and future policy benefit reserves and policy and contract claims covered under reinsurance contracts are recorded in Reinsurance and investment contract recoverables on the Consolidated Balance Sheets. Amounts paid or deemed to have been paid for claims covered by reinsurance contracts are recorded as Receivables on the Consolidated Balance Sheets. Reinsurance and investment contract recoverables are recognized in a manner consistent with the liabilities related to the underlying reinsured contracts. Amounts due to other insurers on assumed business are recorded as a reinsurance payable, and are included in Other liabilities on the Consolidated Balance Sheets. A gain recognized when the Company enters into a coinsurance agreement with a third-party reinsurer is deferred and recorded in Other liabilities on the Consolidated Balance Sheets. Such gains are amortized into operations over the revenue-producing period or the claims run-off period of the related reinsured policies. These amortized gains are recorded in Other revenue in the Consolidated Statements of Operations.
Deferred Acquisition Costs	(k) Deferred Acquisition Costs Acquisition costs consist of commissions and other incremental costs that are directly related to the successful acquisition of insurance contracts. Acquisition costs are deferred to the extent recoverable from future policy revenues and gross profits. However, acquisition costs associated with insurance contracts recorded under the fair value option are not deferred as guidance related to the fair value option requires that transaction costs are recorded immediately as an expense. For life and annuity products, with the exception of variable annuity contracts issued prior to 2010, acquisition costs are amortized in relation to the present value of expected future gross profits from investments and mortality, morbidity, and expense charges. For variable annuity contracts issued prior to 2010, acquisition costs are amortized in relation to the present value of estimated gross revenues from investments and mortality, morbidity, and expense charges. Acquisition costs for accident and health insurance policies are amortized over the lives of the policies in the same manner as premiums are earned. For traditional life and group life products, such costs are amortized over the projected earnings pattern of the related policies using the same actuarial assumptions used in computing future policy benefit reserves. DAC are reviewed for recoverability and loss recognition, at least annually, and adjusted when necessary. The evaluation is a two-step process where current policy year issues are evaluated for recoverability, and then in-force policies are evaluated for loss recognition. Before assessing recoverability and loss recognition, DAC are capped, if necessary, such that the balance cannot exceed the original capitalized costs plus interest. Changes in assumptions can have an impact on the amount of DAC reported for annuity and life insurance products and their related amortization patterns. In the event experience differs from assumptions or assumptions are revised, the Company is required to record an increase or decrease in DAC amortization expense, which is referred to as DAC unlocking. In general, increases in the estimated investment spreads and fees result in increased expected future profitability and may decrease the rate of DAC amortization, while increases in costs of product guarantees, and lapse/surrender and mortality assumptions reduce the expected future profitability of the underlying business and may increase the rate of DAC amortization. The Company formally evaluates the appropriateness of the best-estimate assumptions on an annual basis. If the economic environment or policyholder behavior changes quickly and substantially, assumptions will be reviewed more frequently to affirm best estimates. Any resulting DAC unlocking is reflected prospectively in Change in deferred acquisition costs, net in the Consolidated Statements of Operations. Adjustments to DAC are made to reflect the corresponding impact on the present value of expected future gross profits and revenues from unrealized gains and losses on available-for-sale investments used to support policyholder liabilities (commonly known as shadow DAC). These adjustments are included in AOCI and are explained further in the Investments section of this note. Adjustments may also be made to DAC that correspond to deferred annuities and universal life products for investment activity, such as write-downs on other-than-temporarily impaired fixed-maturity securities and realized gains and losses. Management action may result in assumption changes in the DAC models, such as adjustments to future estimated gross profits (EGP) and estimated gross revenues used, as well as in-force management action such as crediting rate changes or index rate cap adjustments. See further discussion of DAC unlocking in note 9. The Company assesses internal replacements on insurance contracts to determine whether such modifications significantly change the contract terms. An internal replacement represents a modification in product benefits, features, rights, or coverages that occurs by the exchange of an in-force insurance contract for a new insurance contract, or by amendment, endorsement, or rider to a contract. If the modification substantially changes the contract, the remaining DAC on the original contract are immediately expensed and any new DAC on the replacement contract are deferred. If the contract modification does not substantially change the contract, DAC amortization on the original contract continues and any new acquisition costs associated with the modification are immediately expensed.
Deferred Sales Inducements	(l) Deferred Sales Inducements Sales inducements are product features that enhance the investment yield to the contractholder on the contract. The Company offers an immediate bonus on certain annuity contracts which increases the account value at inception. These annuity sales inducements are deferred when credited to contractholders. DSI are reported in Other assets on the Consolidated Balance Sheets. They are amortized over the expected life of the contract in a manner similar to DAC and are reviewed annually for recoverability. DSI amortization is recorded in Policyholder benefits, net of recoveries within the Consolidated Statements of Operations. Adjustments to DSI are made to reflect the estimated corresponding impact on the present value of expected future gross profits and revenues from unrealized gains and losses on available-for-sale investments used to support policyholder liabilities (commonly known as shadow DSI). These adjustments are included in AOCI and are explained further in the Investments section of this note. Adjustments may also be made to DSI for investment activity, such as write-downs on other-than-temporarily impaired fixed-maturity securities, and realized gains and losses. Management action may result in assumption changes in the DSI models, such as adjustments to future EGP used, as well as policyholder changes, such as credited rate changes.
Income Taxes	(m) Income Taxes The Company and its subsidiaries file a consolidated federal income tax return with AZOA and all of its wholly-owned subsidiaries. The consolidated tax allocation agreement stipulates that each company participating in the return will bear its share of the tax liability pursuant to certain tax allocation elections under the Internal Revenue Code (IRC) and its related regulations and reimbursement will be in accordance with an intercompany tax reimbursement arrangement . The Company, and its insurance subsidiaries, generally will be paid for the tax benefit on their losses and any other tax attributes to the extent they could have obtained a benefit against their post-1990 separate return tax liability. The Company provides for federal income taxes based on amounts the Company believes it ultimately will owe. Inherent in the provision for federal income taxes are estimates regarding the deductibility of certain items and the realization of certain tax credits. In the event the ultimate deductibility of certain items or the realization of certain tax credits differs from estimates, the Company may be required to significantly change the provision for federal income taxes recorded on the Consolidated Balance Sheets. Any such change could significantly affect the amounts reported within the Consolidated Statements of Operations. Management uses best estimates to establish reserves based on current facts and circumstances regarding tax exposure items where the ultimate deductibility is open to interpretation. Quarterly, management evaluates the appropriateness of such reserves based on any new developments specific to their fact patterns. Information considered includes results of completed tax examinations, Technical Advice Memorandums, and other rulings issued by the Internal Revenue Service or the tax courts. The Company utilizes the asset and liability method of accounting for income tax. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized within operations in the period that includes the enactment date. Subsequent changes in deferred tax assets and liabilities are recognized in operations or OCI, depending on the nature of the underlying temporary difference. Valuation allowances are established when it is determined that it is more likely than not that the deferred tax asset will not be fully realized or that the related temporary differences will not reverse over time. See note 11 for further details.
Goodwill and Intangible Assets	(n) Goodwill and Intangible Assets Goodwill is the excess of the amount paid to acquire a company over the fair value of its tangible net assets, VOBA, other identifiable intangible assets, and valuation adjustments (such as impairments), if any. Goodwill is reported in Other assets on the Consolidated Balance Sheets. Goodwill is evaluated annually for impairment at the reporting unit level, which is one level below an operating segment. Goodwill of a reporting unit is also tested for impairment on an interim basis if a triggering event occurs, such as a significant adverse change in the business climate or a decision to sell or dispose of a business unit. Intangible assets are required to be recognized apart from goodwill when they arise from contractual or legal rights or are capable of being separated and valued when sold, transferred, licensed, rented, or exchanged. The Company determines the useful life and amortization period for each intangible asset identified at acquisition, and continually monitors these assumptions. An intangible asset with a determinable life is amortized over that period, while an intangible asset with an indefinite useful life is not amortized. The Company’s intangible assets are reported in Other assets on the Consolidated Balance Sheets. These intangible assets were assigned values using the present value of projected future cash flows and are generally amortized over five years using the straight-line method. Recoverability of the value of the determinable-lived intangible assets is assessed whenever events or changes in circumstances indicate the carrying amount may not be recoverable. Recoverability of the value of the indefinite-lived intangible assets is assessed annually or earlier if events or changes in circumstances indicate the carrying amount may not be recoverable.
Value of Business Acquired	(o) Value of Business Acquired The value of insurance in-force purchased is recorded as VOBA and reported in Other assets on the Consolidated Balance Sheets. The initial value was determined by an actuarial study using the present value of future profits in calculating the value of the insurance in-force purchased. An accrual of interest is added to the unamortized balance using the rates credited to the policyholder accounts. The balance is amortized in relation to the present value of future EGP in the same manner as DAC. The amortization period is expected to be approximately 20 years from the date the business was acquired; however, the Company continually monitors this assumption. If actual EGP differ from expectations, the amortization of VOBA is adjusted on a retrospective or prospective basis, as appropriate. Adjustments to VOBA are made to reflect the estimated corresponding impact on the present value of future EGP from unrealized gains and losses on available-for-sale investments used to support policyholder liabilities (commonly known as shadow VOBA). These adjustments are included in AOCI and are explained further in the Investments section of this note. The recoverability of VOBA is evaluated annually, or earlier if factors warrant, based on estimates of future earnings related to the insurance in-force purchased. If the existing insurance liabilities, together with the present value of future net cash flows from the blocks of business acquired, are not sufficient to recover VOBA, the difference, if any, is charged to expense through General and administrative expenses in the Consolidated Statements of Operations.
Held-for-sale Assets and Liabilities	(p) Held-for-sale Assets and Liabilities The Company reported a subsidiary as held-for-sale as of December 31, 2016. The subsidiary's assets of $13,615 were reclassified to held-for-sale and recorded in Other assets on the Consolidated Balance Sheets as of December 31, 2016. The subsidiary's liabilities of $2,754 were reclassified to held-for-sale and recorded in Other liabilities on the Consolidated Balance Sheets as of December 31, 2016. Income and expenses generated from the subsidiary were reclassified and recorded in Other revenue in the Consolidated Statements of Operations. On June 30, 2017, the subsidiary was sold through a stock purchase agreement. See further discussion in note 19.
Home Office Property and Equipment	(q) Home Office Property and Equipment Home office property consists of buildings and land. Equipment consists of furniture, office equipment, leasehold improvements, and computer hardware and software. Both are reported at cost, net of accumulated depreciation, in Other assets on the Consolidated Balance Sheets. Major upgrades and improvements are capitalized, while maintenance and repairs are expensed when incurred. Depreciation is computed over the estimated useful lives of depreciable assets using the straight-line method. The estimated useful lives used for home office property and equipment are 39 years and 2 - 7 years, respectively. The cost and accumulated depreciation for home office property and equipment sold, retired, or otherwise disposed of are relieved from the accounts, and resulting gains or losses are reflected in General and administrative expenses within the Consolidated Statements of Operations. The home office property and equipment balance was $166,260 , net of accumulated depreciation of $170,150 , as of December 31, 2017 and $180,328 , net of accumulated depreciation of $94,395 , as of December 31, 2016 . Pre-operating and start-up costs incurred in connection with the construction of the Company’s headquarters were capitalized until the facility became operational. Interest was also capitalized in connection with the construction and recorded as part of the asset. These costs are being amortized, using the straight-line method, over a 39-year period. Amortization of the the Company's headquarters, including capitalized costs and interest, was $4,394 , $4,394 , and $4,393 during 2017 , 2016 , and 2015 , respectively.
Corporate-Owned Life Insurance	(r) Corporate-Owned Life Insurance Corporate-owned life insurance (COLI) is recognized initially as the amount of premiums paid . Subsequent measurement of the contract is based upon the amount that could be realized assuming the surrender of an individual-life policy (or certificate in a group policy), otherwise known as the cash surrender value. Changes in the cash surrender value are recognized in Other revenue in the Consolidated Statements of Operations. The COLI policies are reported in Other assets on the Consolidated Balance Sheets. There are no contractual restrictions on the ability to surrender the COLI policies held by the Company.
Separate Accounts and Annuity Product Guarantees	(s) Separate Accounts and Annuity Product Guarantees The Company issues variable annuity and maintains variable life contracts through its separate accounts for which investment income and investment gains and losses accrue directly to, and investment risk is borne by, the contractholder. The Company also issues variable-indexed annuity contracts to its customers. These products have investment options similar to fixed-indexed annuities, but allow contractholders to invest in a variety of variable separate account investment options. The Company recognizes gains or losses on transfers from the general account to the separate accounts at fair value to the extent of contractholder interests in separate accounts, which are offset by changes in contractholder liabilities. The Company issues variable annuity and previously issued life contracts through its separate accounts where the Company provides certain contractual guarantees to the contractholder. These guarantees are in the form of a guaranteed minimum death benefit (GMDB), a guaranteed minimum income benefit (GMIB), a guaranteed minimum accumulation benefit (GMAB), and a guaranteed minimum withdrawal benefit (GMWB). The investments backing the guarantees are held in the general account. These guarantees provide for benefits that are payable to the contractholder in the event of death, annuitization, exercise of the living withdrawal benefit, or at specified dates during the accumulation period. Separate account assets supporting variable annuity contracts represent funds for which investment income and investment gains and losses accrue directly to contractholders. Each fund has specific investment objectives and the assets are carried at fair value. The assets of each account are legally segregated and are not subject to claims that arise out of any other business of the Company. Separate account assets and liabilities are reported as summary totals on the Consolidated Balance Sheets. Amounts charged to the contractholders for mortality and contract maintenance are included in Premiums and policy fees, net in the Consolidated Statements of Operations. Administrative and other services are included in Fee and commission revenue in the Consolidated Statements of Operations. These fees have been earned and assessed against contractholders on a daily or monthly basis throughout the contract period and are recognized as revenue when assessed and earned. Changes in GMDB and GMIB are calculated in accordance with the Financial Services – Insurance Topic of the Accounting Standards Codification (Codification) and are included in Policyholder benefits, net of recoveries in the Consolidated Statements of Operations. GMAB and GMWB are considered to be embedded derivatives under the Derivatives and Hedging Topic of the Codification, and the changes in these embedded derivatives are included in Change in fair value of annuity and life embedded derivatives in the Consolidated Statements of Operations. The GMDB net amount at risk is defined as the guaranteed amount that would be paid upon death, less the current accumulated contractholder account value. The GMIB net amount at risk is defined as the current amount that would be needed to fund expected future guaranteed payments less the current contractholder account value, assuming that all benefit selections occur as of the valuation date. The GMAB net amount at risk is defined as the current guaranteed value amount that would be added to the contracts less the current contractholder account value. The GMWB net amount at risk is defined as the current accumulated benefit base amount less the current contractholder account value. The GMDB provides a specified minimum return upon death. The survivor has the option to terminate the contract or continue it and have the death benefit paid into the contract. The Company’s GMDB options have the following features: • Return of Premium • Reset • Ratchet • Rollup • Earnings Protection Rider The GMIB is a living benefit that provides the contractholder with a guaranteed annuitization value. The GMIB features are: • Return of Premium • Ratchet • Rollup The GMDB and GMIB liabilities are determined each period by estimating the expected future claims in excess of the associated account balances. The Company regularly evaluates estimates used and adjusts the additional liability balance, with a related charge or credit to Policyholder benefits, net of recoveries in the Consolidated Statements of Operations , if actual experience or other evidence suggests that earlier assumptions should be revised. The GMAB is a living benefit that provides the contractholder with a guaranteed value that was established at least five years prior at each contract anniversary. This benefit is first available at the fifth contract anniversary, seventh contract anniversary, or tenth contract anniversary depending on the type of contract. Depending on the contractholder’s selection at issue, this value may be either a return of premium or may reflect market gains, adjusted at least proportionately for withdrawals. The contractholder also has the option to reset this benefit. The GMWB is a living benefit that provides the contractholder with a guaranteed amount of income in the form of partial withdrawals. The benefit is payable provided the covered person is between the specified ages in the contract. The benefit is a fixed rate (depending on the age of the covered person) multiplied by the benefit base in the first year the benefit is taken and contract value in following years. The benefit does not decrease if the contract value decreases due to market losses. The benefit can decrease if the contract value is reduced by withdrawals. The benefit base used to calculate the initial benefit is the maximum of the contract value, the quarterly anniversary value, or the guaranteed annual increase of purchase payments (either simple or compound interest, depending on the contract). Additionally, there is a GMWB living benefit where the benefit is an initial payment percentage established at issue, based on issue age. For each year there is a year-over-year contract value increase, the payment percentage will increase by 1.0% (up to age 91). This payment percentage is applied against total purchase payments instead of a benefit base value. The GMAB and GMWB liabilities are determined each period as the difference between the present value of the expected future claims and the expected future profits. One result of this calculation is that these liabilities can be negative (contra liability). If the sum of the total embedded derivative balance is negative, the Company will reclassify the balance as an asset on the Consolidated Balance Sheets. This methodology will also be applied to the fixed-indexed benefit. The Company regularly evaluates estimates used and adjusts the additional liability balance, with a related charge or credit to Change in fair value of annuity and life embedded derivatives in the Consolidated Statements of Operations , if actual experience or other evidence suggests that earlier assumptions should be revised. GMAB cash flows are discounted using a rate equal to current month’s London Interbank Offered Rate (LIBOR) plus a Company specific spread. The expected life-contingent GMWB payments are discounted using a blend of short and long term rates to the date the account value is expected to be exhausted. These obligations and all cash flows are then discounted to the current date using LIBOR plus a Company specific spread. The Company issues fixed-indexed annuities with a GMWB as an optional rider. The GMWB has a roll-up feature. The net amount at risk is partially limited, because the contractholder account value has an annual credit that is floored at zero. Since the account value cannot decrease, in contrast to a variable annuity, the difference between the withdrawal value and the account value will not diverge to the degree that is possible in a variable annuity.
Account Balances and Future Policy Benefit Reserves	(t) Account Balances and Future Policy Benefit Reserves The Company establishes liabilities for amounts payable to policyholders associated with annuity, life insurance, and LTC policies sold. Policy and contract account balances for universal life products are carried at accumulated contract values. For fixed-indexed annuity products, the policyholder obligation is divided into two parts – one part representing the value of the underlying base contract (host contract); and the second part representing the fair value of the expected index benefit over the life of the contract. The host contract is accounted for as an interest-bearing debt instrument. The index benefit is valued at fair value using current capital market assumptions, such as market index and volatility, to estimate future index levels. The index benefit valuation is also dependent upon assumptions of future policyholder behavior. The Company must include provisions for the Company’s own credit risk and for risk that the Company’s assumptions about policyholder activity could differ from actual experience. The fair value determination of the index benefit is sensitive to the economic market and interest rate environment, as it is discounted at current market interest rates. There is volatility in this liability due to these external market sensitivities. Certain two-tier fixed annuity products provide additional benefits payable upon annuitization for period-certain and life-contingent payout options. An additional annuitization reserve is accrued using assumptions consistent with those used in estimating gross profits for purposes of amortizing DAC. Contract account balances for variable annuity products are carried at accumulated contract values. Future policy benefit reserves for any death and income benefits that may exceed the accumulated contract values are established using a range of economic scenarios and are accrued for using assumptions consistent with those used in estimating gross profits or gross revenues for purposes of amortizing DAC. Future policy benefit reserves for accumulation and withdrawal benefits that may exceed account values are established using capital market assumptions, such as market index and volatility, along with estimates of future contractholder behavior. Contract account balances for variable-indexed annuity products are measured at fair value, floored at the current contract value. The fair value measurement uses current capital market assumptions, such as market index and volatility, to estimate future index levels. The contract valuation is also dependent upon estimates of future contractholder behavior. The Company must include provisions for the Company’s own credit risk and for risk that the Company’s assumptions about contractholder activity could differ from actual experience. The fair value determination of the index benefit is sensitive to the economic market and interest rate environment, as it is discounted at current market interest rates. There is volatility in this liability due to these external market sensitivities. However, if the accumulated contract account value exceeds the calculated fair value, the Company records the contract account balances at their current contract value. Future policy benefit reserves on traditional life products are computed by the net level premium method based upon estimated future investment yield, mortality, and withdrawal assumptions, commensurate with the Company’s experience, modified as necessary to reflect anticipated trends, including possible unfavorable deviations. Most life reserve interest assumptions range from 2.3% to 6.0% . Future policy benefit reserves on LTC products are computed using a net level reserve method. Reserves are determined as the excess of the present value of future benefits over the present value of future net premiums and are based on best estimate assumptions at the time of issue for morbidity, mortality, lapse, and interest with provisions for adverse deviation. Most LTC reserve interest assumptions range from 5.0% to 6.0% . An additional LTC reserve has been established to provide for future expected losses that are anticipated to occur after a period of profits. The reserve accrual will be over the profit period and is based on best estimate assumptions as of the current accrual period without provisions for adverse deviation.
Policy and Contract Claims	(u) Policy and Contract Claims Policy and contract claims include the liability for claims reported but not yet paid, claims incurred but not yet reported (IBNR), and claim settlement expenses on the Company’s accident and health business. Actuarial reserve development methods are generally used in the determination of IBNR liabilities. In cases of limited experience or lack of credible claims data, loss ratios are used to determine an appropriate IBNR liability. Claim and IBNR liabilities of a short-term nature are not discounted, but those claim liabilities resulting from disability income or LTC benefits include interest and mortality discounting.
Stockholder's Equity, Accumulated Unrealized Foreign Currency Translation	(v) Stockholder’s Equity, Accumulated Unrealized Foreign Currency Translation Foreign currency translation adjustments are related to the conversion of foreign currency upon the consolidation of a foreign branch (see further discussion in note 23). The net assets of the Company’s foreign operations are translated into U.S. dollars using exchange rates in effect at each year-end. Translation adjustments arising from differences in exchange rates from period to period are included in Foreign currency translation adjustments, net of tax, reported as a separate component of comprehensive income within the Consolidated Statements of Comprehensive Income (Loss).
Prescribed and Permitted Statutory Accounting Practices	(w) Prescribed and Permitted Statutory Accounting Practices The Company is required to file annual statements with insurance regulatory authorities, which are prepared on an accounting basis permitted or prescribed by such authorities. Prescribed statutory accounting practices include state laws, regulations, and general administrative rules, as well as a variety of publications of the National Association of Insurance Commissioners (NAIC). Permitted statutory accounting practices encompass all accounting practices that are not prescribed; such practices differ from state to state, may differ from company to company within a state, and may change in the future. The Company and its subsidiaries did not have any permitted practices in effect as of December 31, 2017 . The Company’s subsidiary, Allianz Life Insurance Company of Missouri (AZMO), has adopted an accounting practice that is prescribed by the Department of Insurance, Financial Institutions, and Professional Registration of the State of Missouri (the Missouri Department). The effect of the accounting practice allows a letter of credit to be carried as an admitted asset. Under NAIC statutory accounting principles (SAP), this letter of credit would not be allowed as an admitted asset. This prescribed practice does not impact the net income of AZMO and results in a $ 103,530 increase to statutory surplus as of December 31, 2017 . The Company and its subsidiaries do not have any other prescribed practices that had an impact on net income or statutory surplus as of December 31, 2017 .
Recently Issued Accounting Pronouncements - Adopted	(x) Recently Issued Accounting Pronouncements – Adopted In October 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-17, Consolidation: Interests Held through Related-Parties that are under Common Control, to require a reporting entity to include all of its direct variable interests in a VIE, and on a proportionate basis, its indirect variable interests in a VIE held through related parties, including related parties that are under common control with the reporting entity, when determining whether the reporting entity is the primary beneficiary of the VIE, and therefore required to consolidate the VIE. The amendments in this update are effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The amendments in this update do not have an impact on the Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation, to update share-based payment accounting for income tax consequences and classification of awards on the balance sheet and statement of cash flows. The amendments in this update are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The amendments in this update do not have an impact on the Consolidated Financial Statements, other than disclosing the entity-wide election to continue estimating forfeitures for share-based payments as included in note 18. In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting, which eliminates the requirement that, upon equity method qualification due to an increase in ownership interest, an investor must adjust the investment, results of operations, and retained earnings retroactively. The entity must recognize the unrealized holding gain or loss currently in AOCI through earnings at the date of qualification. The amendments in this update are effective for all fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The amendments in this update are prospective and do not have an impact on the Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments, to provide clarifying guidance regarding the assessment of whether contingent call or put options on debt instruments are clearly related to their debt hosts. The amendments in this update eliminate diversity in practice in assessing embedded contingent call and put options in debt instruments by requiring an entity to make the assessment solely with the four-step decision process. The amendments in this update are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The amendments in this update do not have an impact on the Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-05, Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, which adds guidance to clarify that in the event of a change in counterparty to the derivative instrument designated as a hedging instrument, the change will not require dedesignation unless other criteria are also present. The amendments in this update are effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The amendments in this update are prospective and do not have a material impact on the Consolidated Financial Statements.
Recently Issued Accounting Pronouncements - To Be Adopted	(y) Recently Issued Accounting Pronouncements – To Be Adopted The FASB issued the following updates as part of their comprehensive new revenue recognition standard: • ASU 2014-09, Revenue from Contracts with Customers. This update defines the new standard for recognizing revenue from contracts when goods and services are transferred to a customer in exchange for payment. The model requires 1) identifying contracts with a customer; 2) identifying separate performance obligations; 3) determining the transaction price; 4) allocating the transaction price to the separate performance obligations; and 5) recognizing revenue when (or as) the entity satisfies a performance obligation. The revenue recognition standard does not apply to financial instruments or to insurance contracts. However, the standard will require significantly more disclosures about items that are recorded under the new revenue recognition model. The amendments in this update are effective for fiscal years beginning after December 15, 2017. • ASU 2016-08, Revenue Recognition - Principal versus Agent (reporting revenue gross versus net). This update adds clarifications to the principal versus agent guidance contained within ASU 2014-09 and provides guidance to aid in the assessment of control. Under the new guidance, an entity that controls the specified good or services before it is transferred to a customer is considered a principal and will recognize revenue on a gross basis. The amendments in this update are effective concurrently with ASU 2014-09. • ASU 2016-12, Revenue Recognition - Narrow-scope Improvements and Practical Expedients. This update provides clarifying guidance impacting several areas of the new standard, including noncash consideration and assessing collectibility. The amendments in this update are effective concurrently with ASU 2014-09. • ASU 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers. This update makes various minor clarifications to the guidance issued in ASU 2014-09. The amendments in this update are effective concurrently with ASU 2014-09. Currently, fee and commission income is recognized upon completion of the service and is recorded in Fee and commission revenue in the Consolidated Statements of Operations. Management and advisory fees are currently recognized periodically as income over the respective investment period for which services have been performed; and fund administrative fees are recognized as the services are performed. Management, advisory, and fund administrative fees are recorded in Other revenue in the Consolidated Statements of Operations. Previous guidance requires revenue recognition when it is earned and realized/realizable including consideration of when it is fixed or determinable. Under the new standard, the Company will be required to recognize fee and commission income when the intermediary has satisfied its performance obligation (provision of placement services) and the customer has contractually agreed to the terms of the insurance policy so long as it is probable that the agreement will not be subject to reversal. Similar to previous guidance, management and advisory fees, and fund administrative fees are recognized periodically as income over the period for which services have been performed (usually less than one year) so long as it is probable that the contract will not be subject to clawback. The new standard has not resulted in acceleration in revenue recognition for certain fees and commissions compared to the current method, as anticipated. Rather, recognition of fee and commission income, management and advisory fees, and fund administrative fees has remained relatively unchanged. Further, revenue is currently recognized on a gross basis as earned since the Company maintains control of the good or service before it is transferred. The amendments related to principal versus agent considerations do not impose a change to this recognition. The Company has evaluated the impact of the new standard, and has determined no further impacts on the recognition and presentation of revenue. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which permits stranded tax effects resulting from the passing of H.R.1, commonly referred to as the Tax Cuts and Jobs Act of 2017 (Tax Act of 2017), to be reclassified to retained earnings. The amendments in this update are effective for fiscal years and interim periods beginning after December 15, 2018, with early adoption permitted. Upon adoption, the Company expects the amendments in this update will decrease Retained earnings as of January 1, 2018 by approximately $393,559 with a corresponding increase to AOCI. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. The amendments in this update improve presentation of the Company’s risk management activities in its financial statements and simplify application of current hedge accounting guidance. The amendments in this update require presentation of the derivative and hedged item in the same income statement line item, eliminate reporting and measurement of hedge ineffectiveness, and simplify hedge effectiveness testing. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently assessing the impact of the amendments in this update. In March 2017, the FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities. The amendments in this update shorten the amortization period for certain callable debt securities held at a premium. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the amendments in this update to have a material impact on the Consolidated Financial Statements upon adoption. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendments within this update eliminate step two of the current two-step goodwill impairment test. The new guidance will only require a one-step quantitative impairment test where the goodwill impairment loss is measured as the excess reporting unit’s carrying amount over its fair value (but not to exceed the total goodwill allocated to the reporting unit). The amendments in this update are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The amendments in this update are not expected to have an impact on the Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The amendments within this update clarify the guidance for determining what constitutes a business to help entities evaluate whether transactions shall be accounted for as acquisitions (or disposals) of businesses. The amendments in this update are for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect the amendments in this update to have an impact on the Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash, to require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect the amendments in this update to have an impact on the Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other than Inventory, to require entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when it is sold externally. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect the amendments in this update to have an impact on the Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, to clarify or provide additional guidance regarding eight specific cash flow issues. These issues address the following topics: 1) debt prepayment or debt extinguishment costs; 2) settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; 3) contingent consideration payments made after a business combination; 4) proceeds from the settlement of insurance claims; 5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; 6) distributions received from equity method investees; 7) beneficial interests in securitization transactions; and 8) separately identifiable cash flows and application of the predominance principle. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company will elect to apply the cumulative earnings approach in recording distributions from equity method investments in the Consolidated Statements of Cash Flows upon adopting the amendments in this update. The Company does not expect the amendments in this update to have a material impact on the Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, to replace the existing incurred loss impairment model with a new methodology that reflects expected credit losses and requires the entity to consider more information to develop credit loss estimates. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 15, 2018. The Company is currently assessing the impact of the amendments in this update. In February 2016, the FASB issued ASU 2016-02, Leases, to require that the lessee recognize a right-of-use asset and a lease liability for all leases. There continues to be a distinction between finance leases and operating leases; however, operating leases will now require that the lease assets and liabilities be recognized in the statement of financial position. Lessor accounting remains largely unchanged. The amendments in this update are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The Company is currently assessing the impact of the amendments in this update. The Company does not anticipate a material impact as it does not hold material leases as a lessee; however, it does anticipate that currently held leases would require recognition of a right-of-use asset and lease liability in accordance with the update. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, to make various targeted improvements to the accounting for financial instruments, especially equity investments. In particular, the amendments in this update provide improvements to recognition, measurement, presentation and disclosure guidance. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company reclassified $10,836 from AOCI to Retained earnings on January 1, 2018 as a result of changing available-for-sale equity security measurement from fair value through other comprehensive income to fair value through profit and loss upon adoption of the amendments in this update.
Accounting Changes	(z) Accounting Changes There were no accounting changes made by the Company during the year ended December 31, 2017 . (aa) Reclassifications Certain amounts in the prior years' Consolidated Financial Statements and related footnotes thereto have been reclassified to conform to the current year presentation.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value of Available-for-Sale and Held -to-maturity Securities	At December 31, 2017 and 2016 , the amortized cost or cost, gross unrealized gains, gross unrealized losses, and fair values of available-for-sale and held-to-maturity securities are as shown in the following tables: Amortized cost or cost Gross unrealized gains Gross unrealized losses Fair value 2017: Fixed-maturity securities, available-for-sale: U.S. government $ 2,449,361 15,159 23,066 2,441,454 Agencies not backed by the full faith and credit of the U.S. government 6,692 232 107 6,817 States and political subdivisions 10,177,673 1,154,762 14,709 11,317,726 Foreign government 523,356 19,773 2,516 540,613 Corporate securities 65,145,715 5,068,907 169,349 70,045,273 Mortgage-backed securities 14,297,121 246,150 117,431 14,425,840 CDO 15,243 12,322 — 27,565 Total fixed-maturity securities, available-for-sale 92,615,161 6,517,305 327,178 98,805,288 Equity securities, available-for-sale: Common stock 259,573 10,836 — 270,409 Preferred stock 1,500 — — 1,500 Total equity securities, available-for-sale 261,073 10,836 — 271,909 Total available-for-sale securities $ 92,876,234 6,528,141 327,178 99,077,197 Amortized cost or cost Gross unrealized gains Gross unrealized losses Fair value 2016: Fixed-maturity securities, available-for-sale: U.S. government $ 1,712,400 41,003 16,880 1,736,523 Agencies not backed by the full faith and credit of the U.S. government 8,766 113 22 8,857 States and political subdivisions 9,379,273 612,248 36,908 9,954,613 Foreign government 426,724 21,006 8,803 438,927 Corporate securities 60,668,745 3,489,117 617,795 63,540,067 Mortgage-backed securities 11,824,876 189,019 165,842 11,848,053 CDO 8,861 11,070 — 19,931 Total fixed-maturity securities, available-for-sale 84,029,645 4,363,576 846,250 87,546,971 Fixed-maturity securities, held-to-maturity: Corporate securities 28 5 — 33 CDO — 3,597 — 3,597 Total fixed-maturity securities, held-to-maturity 28 3,602 — 3,630 Equity securities, available-for-sale: Common stock 316,541 3,625 — 320,166 Total available-for-sale and held-to-maturity securities $ 84,346,214 4,370,803 846,250 87,870,767
Net Unrealized Gains (Losses) on Available-for-Sale Securities and Effective Portion of Cash Flow Hedges	The net unrealized gains (losses) on available-for-sale securities , held-for-sale securities and effective portion of cash flow hedges consist of the following at December 31 : 2017 2016 2015 Available-for-sale securities: Fixed-maturity $ 6,190,127 3,517,326 1,553,935 Equity 10,836 3,625 (2,394 ) Held-for-sale securities — 614 798 Cash flow hedges (41,993 ) (29,547 ) 16,013 Adjustments for: Shadow adjustments (3,007,245 ) (1,728,234 ) (825,607 ) Deferred taxes (1,055,043 ) (617,324 ) (259,961 ) Net unrealized gains (losses) $ 2,096,682 1,146,460 482,784
Amortized Cost and Fair Value of Fixed Maturity Securities, by Contractual Maturity	The amortized cost and fair value of available-for-sale fixed-maturity securities at December 31, 2017 , by contractual maturity, are shown below: Amortized cost Fair value Fixed-maturity securities, available-for-sale: Due in one year or less $ 2,218,716 2,249,030 Due after one year through five years 13,236,678 13,781,829 Due after five years through ten years 21,315,386 21,909,438 Due after ten years 40,556,205 45,411,155 Structured securities 15,288,176 15,453,836 Total fixed-maturity securities, available-for-sale $ 92,615,161 98,805,288
Unrealized Losses on Available-For-Sale Securities and Related Fair Value	The following table summarizes the fair value and related unrealized losses on available-for-sale securities that have been in a continuous loss position for the respective years ended December 31 are shown below: 12 months or less Greater than 12 months Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses 2017: Fixed-maturity securities, available-for-sale: U.S. government $ 1,583,775 9,319 472,276 13,747 2,056,051 23,066 Agencies not backed by the full faith and credit of the U.S. government 4,357 107 — — 4,357 107 States and political subdivisions 221,614 2,612 250,963 12,097 472,577 14,709 Foreign government 81,717 830 35,805 1,686 117,522 2,516 Corporate securities 4,053,797 37,776 3,507,087 131,573 7,560,884 169,349 Mortgage-backed securities 3,434,109 24,415 2,791,216 93,016 6,225,325 117,431 Total temporarily impaired securities $ 9,379,369 75,059 7,057,347 252,119 16,436,716 327,178 12 months or less Greater than 12 months Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses 2016: Fixed-maturity securities, available-for-sale: U.S. government $ 691,559 16,880 — — 691,559 16,880 Agencies not backed by the full faith and credit of the U.S. government 3,332 22 — — 3,332 22 States and political subdivisions 1,587,063 30,524 103,316 6,384 1,690,379 36,908 Foreign government 99,527 6,634 10,383 2,169 109,910 8,803 Corporate securities 12,637,792 433,682 2,000,338 184,113 14,638,130 617,795 Mortgage-backed securities 5,003,928 164,368 31,040 1,474 5,034,968 165,842 Total temporarily impaired securities $ 20,023,201 652,110 2,145,077 194,140 22,168,278 846,250
Cumulative Credit Impairments on Fixed-maturity Securities	The following table presents a rollforward of the Company’s cumulative credit impairments on fixed-maturity securities held at December 31 : 2017 2016 Balance as of January 1 $ 115,430 59,365 Additions for credit impairments recognized on: Securities not previously impaired 48,574 174,823 Reductions for credit impairments previously on: Securities that matured, were sold, or were liquidated during the period (111,956 ) (118,758 ) Balance as of December 31 $ 52,048 115,430
Gross and Net Realized Investment Gains (Losses)	Gross and net realized investment gains (losses) for the years ended December 31 are summarized as follows: 2017 2016 2015 Available-for-sale: Fixed-maturity securities: Gross gains on sales and exchanges $ 151,815 198,851 108,094 Gross losses on sales and exchanges (37,415 ) (71,002 ) (15,272 ) OTTI (48,574 ) (172,530 ) (57,598 ) Net gains (losses) on fixed-maturity securities 65,826 (44,681 ) 35,224 Equity securities: Gross gains on sales 5,289 3,109 2 Gross losses on sales (1,054 ) (897 ) (184 ) Net gains (losses) on equity securities 4,235 2,212 (182 ) Net gains (losses) on available-for-sale securities 70,061 (42,469 ) 35,042 Held-to-maturity securities: Gross gains on sales and exchanges 4,244 — 31,832 Gross losses on sales and exchanges (11 ) (11 ) (11 ) Net gains (losses) on held-to-maturity securities 4,233 (11 ) 31,821 Gain on real estate sales — — 5,929 Other 9,328 (6,845 ) 21,621 Net realized investment gains (losses) $ 83,622 (49,325 ) 94,413
Proceeds from Sale of Available for Sale Investments	Proceeds from sales of available-for-sale securities for the years ended December 31 are presented in the following table: 2017 2016 2015 Available-for-sale securities: Fixed-maturity $ 2,567,050 2,177,408 996,801 Equity 136,911 152,821 58,858
Recognized Unrealized Gain (Loss) on Investments	The portion of trading gains and losses for the year ended December 31 related to trading securities still held at the reporting date is shown below: 2017 2016 2015 Net gains (losses) recognized during the period on trading securities $ 21,109 12,133 (17,268 ) Less: Net gains (losses) recognized during the period on trading securities sold during the period 7,738 (2,205 ) 576 Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date $ 13,371 14,338 (17,844 )
Interest and Similar Income, Net	Major categories of Interest and similar income, net, for the respective years ended December 31 are shown below: 2017 2016 2015 Interest and similar income: Available-for-sale fixed-maturity securities $ 3,968,147 3,847,272 3,752,867 Held-to-maturity fixed-maturity securities 58 1,012 5,746 Mortgage loans on real estate 559,236 470,547 413,103 Derivative assets 13,622 11,121 5,197 Loans to affiliates 625 384 516 Policy loans 9,794 10,015 9,834 Available-for-sale equity securities 6,752 11,314 1,416 Fair value option and trading equity securities 10,647 6,814 11,838 Other invested assets 13,977 32,857 32,618 Short-term securities and cash and cash equivalents 27,878 13,896 8,761 Total 4,610,736 4,405,232 4,241,896 Less: Investment expenses 88,517 79,495 66,427 Total interest and similar income, net $ 4,522,219 4,325,737 4,175,469
Fixed-Maturity Securities Purchases with Deteriorated Credit Quality	The Company acquired fixed-maturity securities for which there was evidence of credit quality deterioration since origination and for which it was probable at the acquisition date that the Company would be unable to collect all contractually required payments. The outstanding balance and carrying amount of the fixed-maturity securities purchased with deteriorated credit quality at December 31 are shown below: 2017 2016 Fixed-maturity securities, available-for-sale: Outstanding balance $ 301,715 261,260 Carrying amount 183,045 139,863 The following table presents activity for the accretable yield on fixed-maturity securities purchased with deteriorated credit quality: 2017 2016 Fixed-maturity securities, available-for-sale: Balance, beginning of year $ 102,221 135,075 Additions 11,487 — Accretion (11,687 ) (19,798 ) Reclassifications from nonaccretable difference (4,024 ) (4,805 ) Disposals — (8,251 ) Balance, end of year $ 97,997 102,221 Fixed-maturity securities acquired each year for which it was probable at acquisition that all contractually required payments would not be collected are as follows: 2017 2016 2015 Fixed-maturity securities, available-for-sale: Contractually required payments receivable $ 69,695 — 99,975 Cash flows expected to be collected 55,425 — 65,489 Basis in acquired securities 43,938 — 39,823
Investment in Mortgage Loans on Real Estate	the Company's mortgage loans on real estate portfolio include concentrations exceeding 10% for the following states: 2017 2016 Concentration Amount Concentration % Concentration Amount Concentration % California $ 2,951,697 25.0 % $ 2,925,356 28.1 % Illinois (1) — — 1,085,445 10.4 (1) Mortgage loans on real estate in Illinois did not exceed 10% of the Company's mortgage loan portfolio in 2017.
Schedule of Cash Collateral Liability By Loaned Security Type	The collateral received by loaned security type at December 31 is as follows: 2017 2016 Remaining contractual maturity of the agreements Remaining contractual maturity of the agreements Open (1) Open (1)(2) Foreign government $ 25,788 10,551 Corporate securities 2,650,124 2,877,606 Total $ 2,675,912 2,888,157 (1) There is no contractual maturity on the lending agreements. The related loaned security could be returned to the Company on the next business day with notice from the counterparty and the Company would be required to return the collateral immediately. (2) The previously issued 2016 Consolidated Financial Statements disclosed only the cash collateral received by loaned security type. These amounts have been updated to conform with current year presentation to include noncash and cash collateral received by loaned security type.
Schedule of Financial Instruments Owned and Pledged as Collateral	Reinvested collateral is recorded in Collateral held from securities lending agreements on the Consolidated Balance Sheets. The amount and type of reinvested collateral at December 31 is as follows: 2017 2016 Cash and cash equivalents $ 1,668,868 1,445,249 Short-term investments 988,178 1,115,970 Total $ 2,657,046 2,561,219
Schedule of Carrying Amount and Maximum Exposure Relating to VIE	The carrying amount and maximum exposure to loss relating to VIEs in which the Company is not deemed to be the primary beneficiary as of December 31 were as follows: 2017 2016 Carrying amount Maximum exposure to loss (1) Carrying amount Maximum exposure to loss (1) Fixed-maturity securities, available-for-sale: Corporate securities $ 1,000,431 1,000,431 981,066 981,066 Mortgage-backed securities 14,425,840 14,425,840 11,823,561 11,823,561 CDO 27,565 27,565 19,931 19,931 Total fixed-maturity securities, available-for-sale 15,453,836 15,453,836 12,824,558 12,824,558 Other invested assets 78,230 387,639 205,302 487,711 Total investments $ 15,532,066 15,841,475 13,029,860 13,312,269 (1) The maximum exposure to loss is equal to the carrying amount for Fixed-maturity securities, available-for-sale. The maximum exposure to loss related to Other invested assets is equal to the carrying amount plus any unfunded commitments.

Derivatives and Hedging Instr38

Derivatives and Hedging Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Components of Gains or Losses Related to Derivatives that Qualify as Cash Flow Hedges	The following table presents the components of the unrealized gains and losses on the effective portion of the derivatives that qualify as cash flow hedges recorded within the Consolidated Statements of Comprehensive Income (Loss): Amount of gains (losses) recognized in AOCI at December 31, 2017 2016 2015 Interest rate swaps, net of tax benefit of $0, $0, and $332, at December 31, 2017, 2016, and 2015, respectively $ — — (617 ) Foreign currency swaps, net of tax benefit (expense) of $37,215, ($12,355), and ($15,550), at December 31, 2017, 2016, and 2015, respectively (69,113 ) 22,945 28,879 Total $ (69,113 ) 22,945 28,262 The following tables presents the amount of gains reclassified from AOCI into earnings on the effective and ineffective portion of the derivatives that qualify as cash flow hedges: Amount of gains reclassified from AOCI into earnings for the years end December 31 (effective portion): Location in the 2017 2016 2015 Foreign currency swaps , net of tax expense of $4,768, $3,892, and $1,819, at December 31, 2017, 2016, and 2015, respectively $ 8,854 7,229 3,378 Interest and similar income, net Total $ 8,854 7,229 3,378 Amount of gains reclassified from AOCI into earnings for the years end December 31 (ineffective portion): Location in the 2017 2016 2015 Foreign currency swaps, net of tax expense of $247, $85, and $0, at December 31, 2017, 2016, and 2015, respectively $ 459 158 — Change in fair value of assets and liabilities Total $ 459 158 —
Credit Derivative Type By Derivative Risk Exposure And Reference Type	The following table presents the notional amount, fair value, weighted average years to maturity, underlying referenced credit obligation type, and average credit ratings for the credit derivatives in which the Company was assuming credit risk as of December 31 : Credit Derivative type by derivative risk exposure and reference type Notional amount Fair value Weighted average years to maturity Average credit rating 2017: Basket credit default swaps Investment grade risk exposure U.S. corporate credit $ 175,800 (1,498 ) 6 years BBB+ Total $ 175,800 (1,498 ) 2016: Basket credit default swaps Investment grade risk exposure U.S. corporate credit $ 331,400 367 6 years BBB+ Total $ 331,400 367
Balance Sheet Location and Fair Value of Derivatives	The following table presents a summary of the aggregate notional amounts and fair values of the Company’s freestanding derivative instruments reported on the Consolidated Balance Sheets as of December 31 : 2017 2016 Gross Fair Value Gross Fair Value Notional (1) Assets Liabilities Notional (1) Assets Liabilities Cash flow hedging instruments Foreign currency swaps $ 899,000 $ 38,939 (68,354 ) 676,000 96,975 (11,731 ) Total cash flow hedging instruments 38,939 (68,354 ) 96,975 (11,731 ) Nonqualifying hedging instruments Futures 27,891,125 — — 17,574,373 — — OTC options 119,817,491 1,156,749 (815,960 ) 77,973,809 766,205 (514,758 ) ETO 17,033,569 48,177 (27,678 ) 11,109,074 42,400 (27,345 ) IRS 3,763,500 130,476 (162 ) 7,227,500 144,384 (77,799 ) TRS 2,944,000 12,375 — 7,154,000 5,826 (3,702 ) TBA securities 1,474,100 4 (953 ) 693,900 833 (299 ) SAR — — — 7,422 * 545 — Total nonqualifying hedging instruments 1,347,781 (844,753 ) 960,193 (623,903 ) Total freestanding derivative instruments $ 1,386,720 (913,107 ) 1,057,168 (635,634 ) (1) Notional amounts are presented on a gross basis. * The notional amount for SAR is equal to the number of contracts outstanding.
Schedule of Embedded Derivatives	The following table presents a summary of the fair values of the Company’s embedded derivative instruments reported on the Consolidated Balance Sheets as of December 31 : 2017 2016 GMWB $ (2,004,918 ) (2,156,234 ) GMAB (181,348 ) (243,363 ) MVLO (20,137,427 ) (15,141,482 ) Other embedded derivatives, net (570 ) 1,863 Total embedded derivative instruments $ (22,324,263 ) (17,539,216 )
Gains or Losses Recognized in Income	The following table presents the gains or losses recognized in income on the various nonqualifying freestanding derivative instruments and embedded derivatives: Amount of gain (loss) on derivatives recognized for the years ended December 31, Location in the 2017 2016 2015 GMWB Change in fair value of annuity and life embedded derivatives $ 151,177 14,235 (679,259 ) GMAB Change in fair value of annuity and life embedded derivatives 61,658 96,666 (122,094 ) MVLO Change in fair value of annuity and life embedded derivatives (5,175,605 ) (386,709 ) 212,758 Total change in fair value of annuity and life embedded derivatives (4,962,770 ) (275,808 ) (588,595 ) Futures Change in fair value of assets and liabilities 2,362,617 (287,724 ) (423,134 ) OTC options Change in fair value of assets and liabilities 1,375,643 182,882 (361,419 ) ETO Change in fair value of assets and liabilities 54,103 13,055 291 IRS Change in fair value of assets and liabilities 127,777 87,380 279,158 CDS Change in fair value of assets and liabilities 2,074 4,689 (2,220 ) TRS Change in fair value of assets and liabilities 48,228 (37,143 ) 4,093 TBA securities Change in fair value of assets and liabilities 4,078 (2,837 ) 330 SAR Change in fair value of assets and liabilities 100 (54 ) 630 Other embedded Change in fair value of assets and liabilities (8,120 ) (1,234 ) 1,235 Total change in fair value of assets and liabilities 3,966,500 (40,986 ) (501,036 ) MVLO Premiums and policy fees, net 9,911 (398,942 ) 79,951 MVLO Policyholder benefits, net of recoveries 169,749 139,481 115,737 Total derivative gain (loss), net $ (816,610 ) (576,255 ) (893,943 )
Derivative Assets Subject to Master Netting Arrangement	The following tables present additional information about derivative assets and liabilities subject to an enforceable master netting arrangement as of the dates indicated: December 31, 2017 Gross amounts not offset in the Balance Sheet Gross amounts recognized Gross amounts offset in the Balance Sheet Net amounts presented in the Balance Sheet Financial instruments (1) Collateral (received) / pledged Net amounts Derivative assets $ 1,386,720 — 1,386,720 (855,461 ) (485,646 ) 45,613 Derivative liabilities (913,107 ) — (913,107 ) 855,461 134,000 76,354 Net derivatives $ 473,613 — 473,613 — (351,646 ) 121,967 December 31, 2016 Gross amounts not offset in the Balance Sheet Gross amounts recognized Gross amounts offset in the Balance Sheet Net amounts presented in the Balance Sheet Financial instruments (1) Collateral (received) / pledged Net amounts Derivative assets $ 1,056,623 — 1,056,623 (615,349 ) (395,913 ) 45,361 Derivative liabilities (635,634 ) — (635,634 ) 615,349 37,092 16,807 Net derivatives $ 420,989 — 420,989 — (358,821 ) 62,168 (1) Represents the amount of assets or liabilities that could be offset by liabilities or assets with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following presents the assets and liabilities measured at fair value on a recurring basis and their corresponding level in the fair value hierarchy at December 31: 2017 Total Level 1 Level 2 Level 3 Assets Fixed-maturity securities, available-for-sale: U.S. government $ 2,441,454 2,441,454 — — Agencies not backed by the full faith and credit of the U.S. government 6,817 — 6,817 — States and political subdivisions 11,317,726 — 11,276,965 40,761 Foreign government 540,613 — 507,166 33,447 Corporate securities 70,045,273 — 59,074,307 10,970,966 Mortgage-backed securities 14,425,840 — 14,425,811 29 CDO 27,565 — 27,565 — Fixed-maturity securities, trading 36,219 30,901 5,168 150 Derivative assets 1,388,190 48,177 1,327,638 12,375 Equity securities, available-for-sale 271,909 258,095 — 13,814 Equity securities, fair value option and trading 314,370 288,098 26,272 — Separate account assets 28,192,877 28,192,877 — — Total assets $ 129,008,853 31,259,602 86,677,709 11,071,542 Liabilities Derivative liabilities $ (915,147 ) (27,678 ) (887,469 ) — Reserves at fair value (1) (27,387,975 ) — — (27,387,975 ) Total liabilities $ (28,303,122 ) (27,678 ) (887,469 ) (27,387,975 ) 2016 Total Level 1 Level 2 Level 3 Assets Fixed-maturity securities, available-for-sale: U.S. government $ 1,736,523 1,736,523 — — Agencies not backed by the full faith and credit of the U.S. government 8,857 — 8,857 — States and political subdivisions 9,954,613 — 9,925,338 29,275 Foreign government 438,927 — 404,687 34,240 Corporate securities 63,540,067 — 54,990,599 8,549,468 Mortgage-backed securities 11,848,053 — 11,806,849 41,204 CDO 19,931 — — 19,931 Fixed-maturity securities, trading 37,051 36,901 — 150 Derivative assets 1,059,031 42,400 1,010,805 5,826 Equity securities, available-for-sale 320,166 320,166 — — Equity securities, fair value option and trading 317,493 298,481 19,012 — Separate account assets 27,733,261 27,733,261 — — Total assets $ 117,013,973 30,167,732 78,166,147 8,680,094 Liabilities Derivative liabilities $ (635,634 ) (27,345 ) (604,587 ) (3,702 ) Reserves at fair value (1) (20,152,641 ) — — (20,152,641 ) Total liabilities $ (20,788,275 ) (27,345 ) (604,587 ) (20,156,343 ) (1) Reserves at fair value are reported in Account balances and future policy benefit reserves on the Consolidated Balance Sheets.
Reconciliation of the Beginning and Ending Balances for the Company's Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table provides a reconciliation of the beginning and ending balances for the Company’s Level 3 assets and liabilities measured at fair value on a recurring basis: 2017 Fixed-maturity securities Available-for-sale Trading States and political subdivisions Foreign government Corporate securities Mortgage-backed securities CDO Corporate securities Balance, beginning of year $ 29,275 34,240 8,549,468 41,204 19,931 150 Total realized/unrealized gains (losses) included in: Net income (loss) — — (9,227 ) 678 11,139 — Other comprehensive income (loss) 1,482 (793 ) 310,320 1,279 (11,070 ) — Purchases and issuances 10,004 — 2,660,329 — — — Sales and settlements — — (444,638 ) (24,556 ) (20,000 ) — Transfer out of Level 3 — — (95,286 ) (18,576 ) — — Balance, end of year $ 40,761 33,447 10,970,966 29 — 150 Gains (losses) included in net income related to financial instruments still held at the end of the year $ — — 956 — — — 2016 Fixed-maturity securities Available-for-sale Trading States and political subdivisions Foreign government Corporate securities Mortgage-backed securities CDO Corporate securities Balance, beginning of year $ 499 33,373 7,021,597 54,906 21,164 — Total realized/unrealized gains (losses) included in: Net income (loss) — — (86,539 ) 1,393 — — Other comprehensive income (loss) 790 867 272,556 302 (503 ) — Purchases and issuances 27,986 — 2,054,111 730 — 150 Sales and settlements — — (428,407 ) (16,127 ) (730 ) — Transfer out of Level 3 — — (283,850 ) — — — Balance, end of year $ 29,275 34,240 8,549,468 41,204 19,931 150 Gains (losses) included in net income related to financial instruments still held at the end of the year $ — — (80,134 ) — — 2017 2016 Equity securities, Available-for-sale Derivative assets Derivative liabilities Reserves at fair value (1) Derivative assets Derivative liabilities Reserves at fair value (1) Balance, beginning of year $ — 5,826 (3,702 ) (20,152,641 ) 2,350 (33,812 ) (18,096,009 ) Total realized/unrealized gains (losses) included in: Net income (loss) — 188,230 (101,030 ) (5,550,779 ) 553,778 (583,731 ) (649,516 ) Other comprehensive income (loss) 1,496 — — — — — — Purchases and issuances 12,318 — — (3,186,229 ) — — (2,805,725 ) Sales and settlements — (181,681 ) 104,732 1,501,674 (550,302 ) 613,841 1,398,609 Balance, end of year $ 13,814 12,375 — (27,387,975 ) 5,826 (3,702 ) (20,152,641 ) Gains (losses) included in net income related to financial instruments still held at the end of the year $ — 6,549 3,702 (5,550,779 ) 3,476 (30,111 ) (649,516 ) (1) The Company classifies realized and unrealized gains (losses) on Reserves at fair value as unrealized gains (losses) for purposes of disclosure in this table because the Company monitors Reserves at fair value as a whole unit and does not track realized gains (losses) on a contract-by-contract basis.
Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table provides a summary of the significant unobservable inputs used in the fair value measurements developed by the Company or reasonably available to the Company of Level 3 assets and liabilities on a recurring basis at December 31: 2017 Fair value Valuation technique Unobservable input Range (weighted average) Fixed-maturity securities: Available-for-sale: States and political subdivisions $ 40,761 Discounted cash flow Option adjusted spread* 161 (161) Foreign government 33,447 Discounted cash flow Option adjusted spread 42 - 50 (48) Corporate securities 10,970,966 Discounted cash flow Option adjusted spread 27 - 515 (130) Mortgage-backed securities 29 Third-party vendor Default and discount rates ** Trading: Corporate securities 150 Cost N/A N/A Equity securities: Available-for-sale: Common stock 12,314 Consensus pricing Indicative quotes ($ per share)* $23.65 ($23.65) Preferred stock 1,500 Cost N/A N/A Derivative assets: TRS 12,375 Third-party vendor Spread and discount rates ** Derivative liabilities: TRS — Third-party vendor Spread and discount rates ** Reserves at Fair Value: MVLO (20,137,427 ) Discounted cash flow Annuitizations 0 - 25% Surrenders 0 - 25% Mortality*** 0 - 100% Withdrawal benefit election 0 - 50% GMWB and GMAB (2,186,266 ) Discounted cash flow Surrenders 0.5% - 35% Mortality*** 0% - 100% Variable-indexed annuity (5,064,282 ) Contract value N/A**** N/A**** 2016 Fair value Valuation technique Unobservable input Range (weighted average) Fixed-maturity securities: Available-for-sale: States and political subdivisions $ 29,275 Discounted cash flow Option adjusted spread* 166 (166) Foreign government 34,240 Discounted cash flow Option adjusted spread 62 - 75 (70) Corporate securities 8,549,468 Discounted cash flow Option adjusted spread -214 - 2,112 (147) CDO 19,931 Third-party vendor Default and discount rates ** Mortgage-backed securities 41,204 Third-party vendor Default and discount rates ** Trading: Corporate securities 150 Cost N/A N/A Derivative assets: TRS 5,826 Third-party vendor Spread and discount rates ** Derivative liabilities: TRS (3,702 ) Third-party vendor Spread and discount rates ** Reserves at Fair Value: MVLO (15,141,482 ) Discounted cash flow Annuitizations 0 – 25% Surrenders 0 – 25% Mortality*** 0 – 100% Withdrawal benefit election 0 – 50% GMWB and GMAB (2,399,597 ) Discounted cash flow Surrenders 0.5 – 35% Mortality*** 0 – 100% Variable-indexed annuity (2,611,562 ) Contract value N/A**** N/A**** * No range is applicable due to only one security within classification. ** Management does not have insight into the specific assumptions used. See narrative below for qualitative discussion. *** Mortality assumptions are derived from the Annuity 2000 Mortality Table. See note 14 for further discussion. **** Unobservable inputs are not applicable as the fair value of the variable-indexed annuity reserve is floored at contract value.
Fair Value of Financial Assets and Liabilities	The following table presents the carrying amount and fair value of certain financial instruments that are not reported at fair value at December 31: 2017 Carrying Fair value amount Level 1 Level 2 Level 3 Total Financial assets Mortgage loans on real estate $ 11,761,939 — — 12,372,775 12,372,775 Loans to affiliates 39,120 — — 39,120 39,120 Policy loans 184,409 — 184,409 — 184,409 Other invested assets 302,216 196,672 — 105,544 302,216 Cash equivalents 1,442,057 581,257 860,800 — 1,442,057 Receivables 123,110 — — 123,110 123,110 Reinsurance and investment contract recoverables 1,248,634 — — 1,298,499 1,298,499 Collateral held from securities lending agreements 2,657,046 — 2,657,221 — 2,657,221 COLI 578,951 — 578,951 — 578,951 Financial liabilities Investment contracts $ (79,019,361 ) — — (79,519,680 ) (79,519,680 ) Mortgage notes payable (68,628 ) — — (77,637 ) (77,637 ) Securities lending payable (2,657,046 ) — (2,657,046 ) — (2,657,046 ) Other liabilities (123,110 ) — — (123,110 ) (123,110 ) Separate account liabilities (28,192,877 ) (28,192,877 ) — — (28,192,877 ) 2016 Carrying Fair value amount Level 1 Level 2 Level 3 Total Financial assets Held-to-maturity fixed-maturity securities $ 28 — — 3,630 3,630 Mortgage loans on real estate 10,351,741 — — 10,900,205 10,900,205 Loans to affiliates 39,120 — — 39,120 39,120 Policy loans 171,012 — 171,012 — 171,012 Other invested assets 357,210 — — 426,137 426,137 Cash equivalents 1,250,015 1,150,015 100,000 — 1,250,015 Receivables 144,180 — — 144,180 144,180 Reinsurance and investment contract recoverables 933,074 — — 987,327 987,327 Collateral held from securities lending agreements 2,561,219 — 2,561,985 — 2,561,985 COLI (1) 338,092 — 338,092 — 338,092 Financial liabilities Investment contracts $ (77,305,738 ) — — (78,018,770 ) (78,018,770 ) Mortgage notes payable (76,916 ) — — (87,981 ) (87,981 ) Securities lending payable (2,561,219 ) — (2,561,219 ) — (2,561,219 ) Other liabilities (144,180 ) — — (144,180 ) (144,180 ) Separate account liabilities (1) (27,733,261 ) (27,733,261 ) — — (27,733,261 )

Financing Receivables (Tables)

Financing Receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Loan-to-Value Analysis of Commercial Properties	The credit quality as of December 31 is shown below: Debt Service Coverage Ratios Greater than 1.4x 1.2x – 1.4x 1.0x – 1.2x Less than 1.0x Total Percent of Total 2017: Loan-to-value ratios: Less than 50% $ 3,742,536 52,805 64,700 66,486 3,926,527 33.3 % 50% – 60% 4,205,942 225,433 62,516 14,315 4,508,206 38.2 60% – 70% 2,449,915 597,222 72,784 — 3,119,921 26.4 70% – 80% 74,854 169,431 — — 244,285 2.1 80% – 90% — — — — — — 90% – 100% — — — — — — Greater than 100% — — — — — — Total $ 10,473,247 1,044,891 200,000 80,801 11,798,939 100.0 % Debt Service Coverage Ratios Greater than 1.4x 1.2x – 1.4x 1.0x – 1.2x Less than 1.0x Total Percent of Total 2016: Loan-to-value ratios: Less than 50% $ 3,694,757 133,289 53,761 — 3,881,807 37.3 % 50% – 60% 3,740,956 173,453 23,378 18,930 3,956,717 38.0 60% – 70% 1,442,783 502,746 26,005 43,607 2,015,141 19.4 70% – 80% 198,103 153,481 24,086 — 375,670 3.6 80% – 90% 57,439 83,046 27,384 2,937 170,806 1.7 90% – 100% — — — — — — Greater than 100% — — — — — — Total $ 9,134,038 1,046,015 154,614 65,474 10,400,141 100.0 %
Nontrade Receivables and Allowance for Credit Losses	The nontrade receivable and allowance for credit losses by customer classification as of December 31 are shown below: 2017 2016 Agent Reinsurer Total Agent Reinsurer Total Nontrade receivables $ 14,167 27,710 41,877 11,860 20,963 32,823 Allowance for credit losses (4,301 ) — (4,301 ) (4,876 ) — (4,876 ) Net nontrade receivables $ 9,866 27,710 37,576 6,984 20,963 27,947
Allowances For Credit Losses And Investment in Financing Receivables	The allowances for credit losses and recorded investment in financing receivables as of December 31 are shown below: Mortgage loans Nontrade receivables Loans to affiliates Loans to non-affiliates Total 2017: Financing receivables, gross $ 11,798,939 41,877 39,120 10,137 11,890,073 Allowance for credit losses: Beginning balance 48,400 4,876 — — 53,276 Provision / (benefit) (11,400 ) (575 ) — — (11,975 ) Ending balance 37,000 4,301 — — 41,301 Financing receivables ending balance net of valuation allowance $ 11,761,939 37,576 39,120 10,137 11,848,772 Mortgage loans Nontrade receivables Loans to affiliates Loans to non-affiliates Total 2016: Financing receivables, gross $ 10,400,141 32,823 39,120 10,145 10,482,229 Allowance for credit losses: Beginning balance 37,400 5,525 — — 42,925 Provision / (benefit) 11,000 (649 ) — — 10,351 Ending balance 48,400 4,876 — — 53,276 Financing receivables ending balance net of valuation allowance $ 10,351,741 27,947 39,120 10,145 10,428,953
Aging Analysis of Past Due Financing Receivables	Aging analysis of past-due financing receivables as of December 31 is shown below: 31-60 days past due 61-90 days past due Greater than 90 days past due Total past due Current Total 2017: Mortgage loans $ — — — — 11,798,939 11,798,939 Nontrade receivables 9,955 1,279 8,200 19,434 22,443 41,877 Loans to affiliates — — — — 39,120 39,120 Loans to non-affiliates — 18 481 499 9,638 10,137 Total $ 9,955 1,297 8,681 19,933 11,870,140 11,890,073 31-60 days past due 61-90 days past due Greater than 90 days past due Total past due Current Total 2016: Mortgage loans $ — — — — 10,400,141 10,400,141 Nontrade receivables 7,590 1,662 6,712 15,964 16,859 32,823 Loans to affiliates — — — — 39,120 39,120 Loans to non-affiliates 109 10 71 190 9,955 10,145 Total $ 7,699 1,672 6,783 16,154 10,466,075 10,482,229

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2017
Effect of Reinsurance on Benefits	The effect of reinsurance on benefits for the respective years ended December 31 is shown below: 2017 2016 2015 Direct benefits Life $ 425,845 263,594 175,293 Annuities 6,601,650 2,015,225 2,333,922 Accident and health 566,988 630,148 590,984 Total direct benefits 7,594,483 2,908,967 3,100,199 Less: Ceded to other companies Life 73,471 67,801 65,118 Annuities 33,230 33,024 39,481 Accident and health 376,797 427,153 395,226 Total ceded to other companies 483,498 527,978 499,825 Plus: Assumed from other companies Life 127 650 1,057 Annuities 1,701 1,520 1,663 Accident and health 16,426 19 — Total assumed from other companies 18,254 2,189 2,720 Total benefits $ 7,129,239 2,383,178 2,603,094
Reinsurance and Investment Contract Recoverables	Components of the Company's reinsurance and investment contract recoverables as of December 31 are shown below: 2017 2016 Life $ 986,636 1,031,953 Annuities 1,275,293 890,709 Accident and health 3,033,557 2,765,256 Total reinsurance and investment contract recoverables $ 5,295,486 4,687,918

Deferred Acquisition Costs (Tab

Deferred Acquisition Costs (Tables)	12 Months Ended
	Dec. 31, 2017
Deferred Acquisition Costs	DAC at December 31 and the changes in the balance for the years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ 5,246,343 6,283,236 4,362,771 Capitalization 730,825 1,006,773 911,425 Interest 239,127 172,195 181,239 Amortization (1,244,315 ) (1,438,375 ) (1,331,923 ) Change in shadow DAC (1,121,140 ) (777,486 ) 2,159,724 Balance, end of year $ 3,850,840 5,246,343 6,283,236
Pretax Impact on Assets and Liabilities as Result of Unlocking	The pretax impact on the Company’s assets and liabilities as a result of the unlocking during the years ended December 31 is as follows: 2017 2016 2015 Assets: DAC $ (177,274 ) (246,669 ) (109,797 ) DSI (35,266 ) (51,156 ) (32,400 ) VOBA — (212 ) (180 ) Reinsurance and investment contract recoverables (7,645 ) 2,934 5,471 Total increase (decrease) in assets (220,185 ) (295,103 ) (136,906 ) Liabilities: Account balances and future policy benefit reserves (330,853 ) (412,959 ) (154,064 ) Unearned premiums (7,070 ) (1,787 ) (48,369 ) Total increase (decrease) in liabilities (337,923 ) (414,746 ) (202,433 ) Net increase (decrease) in income before taxes $ 117,738 119,643 65,527

Deferred Sales Inducements (Tab

Deferred Sales Inducements (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Deferred Sales Inducement	DSI at December 31 and the changes in the balance for years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ 764,554 1,110,192 847,000 Capitalization 14,726 29,176 48,546 Amortization (207,629 ) (277,616 ) (284,883 ) Interest 23,107 28,569 33,927 Change in shadow DSI (163,440 ) (125,767 ) 465,602 Balance, end of year $ 431,318 764,554 1,110,192

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax (Benefit) Expense	Total income tax expense for the years ended December 31 is as follows : 2017 2016 2015 Income tax expense (benefit) attributable to operations: Current tax expense (benefit) $ 83,114 558,016 551,052 Deferred tax expense (benefit) 125,443 (202,860 ) (307,986 ) Total income tax expense (benefit) attributable to net income (loss) 208,557 355,156 243,066 Income tax effect on AOCI: Attributable to unrealized gain (loss) on: Investments 437,719 357,363 (691,519 ) Postretirement obligations (2 ) 36 — Foreign exchange 461 373 (2,159 ) Total income tax effect on equity $ 646,735 712,928 (450,612 )
Income Tax (Benefit) Expense Computed at the Statutory Rate	Income tax expense computed at the statutory rate of 35% varies from Income tax expense reported in the Consolidated Statements of Operations for the respective years ended December 31 as follows: 2017 2016 2015 Income tax expense computed at the statutory rate $ 322,882 400,167 295,177 Dividends-received deductions and tax-exempt interest (38,369 ) (40,326 ) (40,687 ) State income tax (2,074 ) 11,266 4,642 Accrual (release) of LIH tax credits and benefits (1) 11,691 (5,819 ) (1,284 ) Accrual (release) of tax contingency reserve 522 373 (10,701 ) Foreign tax, net (3,410 ) (3,587 ) (3,143 ) COLI (14,301 ) (7,833 ) (2,285 ) Penalties 232 (47 ) 529 Deferred tax revaluation due to tax rate change (2) (70,281 ) — — Other 1,665 962 818 Income tax expense (benefit) as reported $ 208,557 355,156 243,066
Significant Components of Net Deferred Tax Asset (Liability)	Tax effects of temporary differences giving rise to the significant components of the net deferred tax asset (liability). The net deferred tax asset (liability) on the Consolidated Balance Sheets at December 31 is as follows: 2017 2016 Deferred tax assets: Policy reserves $ 2,793,209 3,326,409 Expense accruals 5,569 40,792 Other-than-temporarily impaired assets 11,352 40,821 Provision for postretirement benefits 32,490 49,437 Other 1,148 3,267 Total deferred tax assets 2,843,768 3,460,726 Deferred tax liabilities: Policy reserves (795,733 ) — Deferred acquisition costs (589,011 ) (1,533,188 ) Investment income (303,537 ) (253,987 ) Depreciation and amortization (36,005 ) (59,822 ) Net unrealized gains on investments and foreign exchange (1,295,898 ) (1,225,720 ) Total deferred tax liabilities (3,020,184 ) (3,072,717 ) Net deferred tax asset (liabilities) $ (176,416 ) 388,009
Reconciliation of Unrecognized Tax Benefits	recognizes liabilities for certain unrecognized tax benefits. Reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2017 2016 Balance at January 1 $ 1,697 1,367 Additions based on tax positions related to the current year 845 330 Amounts released related to tax positions taken in prior years (386 ) — Balance at December 31 $ 2,156 1,697

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Goodwill	Goodwill at December 31, 2017 and 2016 , and the changes in the balance for the years then ended are as follows: 2017 2016 Balance, beginning of year $ 487,834 482,905 Increase in goodwill due to acquisition (1) — 4,929 Balance, end of year $ 487,834 487,834
Schedule of Intangible Assets	Intangible assets at December 31, 2017 and 2016 , and the changes in the balance for the years then ended are as follows: 2017 2016 Balance, beginning of year $ 2,496 — Increase in intangibles due to acquisition (1) — 2,872 Amortization (410 ) (376 ) Balance, end of year $ 2,086 2,496 (1) The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition.
Schedule of Finite-Lived Intangible Assets Future Amortization Expense	The net amortization of the intangible assets in each of the next five years is as follows: 2018 $ 410 2019 410 2020 410 2021 410 2022 410 2023 and beyond 36 Total $ 2,086

Value of Business Acquired (Tab

Value of Business Acquired (Tables)	12 Months Ended
	Dec. 31, 2017
Value of Business Acquired and Changes in the Balance	VOBA at December 31 and the changes in the balance for the years then ended are as follows: 2017 2016 2015 Balance, beginning of year $ — — — Interest 64 127 210 Amortization (1,857 ) (1,619 ) (2,950 ) Change in shadow VOBA 1,793 1,492 2,740 Balance, end of year $ — — —
Net Amortization of Value of Business Acquired	The net amortization of the VOBA in each of the next five years is expected to be as follows: 2018 $ 1,923 2019 785 2020 and beyond — Total $ 2,708

Separate Accounts and Annuity47

Separate Accounts and Annuity Product Guarantees (Tables)	12 Months Ended
	Dec. 31, 2017
Market Volatility Assumptions	Market volatility assumptions vary by fund type and grade from a current volatility number to long-term assumptions over one year as shown below: 2017 2016 Fund index type Current volatility Long-term forward volatility Current volatility Long-term forward volatility Large cap 13.4 % 18.0 % 16.3 % 18.1 % Bond 3.4 3.9 3.4 3.9 International 13.7 21.2 16.8 21.4 Small cap 17.4 21.5 20.3 21.5
Schedule of Guaranteed Minimums	Guaranteed minimum benefits for the respective years ended December 31 are summarized as follows (note that the amounts listed are not mutually exclusive, as many products contain multiple guarantees): 2017 2016 Account value Net amount at risk Weighted age (years) Account value Net amount at risk Weighted age (years) GMDB: Return of premium $ 26,092,333 25,909 64 23,400,820 73,163 64 Ratchet and return of premium 4,555,502 26,368 68 4,602,792 142,357 68 Ratchet and rollup 3,598,920 365,871 72 3,602,988 484,301 71 Ratchet and earnings protection rider 2,902 624 86 3,072 885 84 Reset 81,771 475 77 84,191 692 76 Earnings protection rider 236,407 26,865 70 235,360 22,383 69 Total $ 34,567,835 446,112 31,929,223 723,781 GMIB: Return of premium $ 88,576 265 74 92,121 325 73 Ratchet and return of premium 1,728,722 446 71 1,885,185 4,526 70 Ratchet and rollup 4,603,105 453,715 68 4,653,568 723,893 68 Total $ 6,420,403 454,426 6,630,874 728,744 GMAB: Five years $ 2,489,002 1,185 71 2,738,307 10,160 70 Ten years 2,994 1 84 3,212 1 82 Target date retirement-7 year 578,324 447 65 613,746 1,218 64 Target date retirement-10 year 235,167 534 62 250,033 4,559 61 Target date with management levers 3,201,192 11,720 63 3,332,790 73,070 62 Total $ 6,506,679 13,887 6,938,088 89,008 GMWB: No living benefit $ 762,569 — 69 707,212 — 69 Life benefit with optional reset 927,637 145,062 69 921,876 171,135 69 Life benefit with automatic reset 1,521,855 133,182 66 1,471,419 194,438 65 Life benefit with 8% rollup 27,283 4,380 72 28,562 6,286 70 Life benefit with 10% rollup 1,141,470 291,570 65 1,109,985 348,423 65 Life benefit with management levers 12,111,092 1,912,242 62 11,579,110 2,307,239 61 Total $ 16,491,906 2,486,436 15,818,164 3,027,521
Variable Annuity Account Balances Invested In Separate Account	At December 31 , variable annuity account balances were invested in separate account funds with the following investment objectives. Balances are presented at fair value: Investment type 2017 2016 Bond $ 3,303,084 3,484,805 Domestic equity 14,506,783 13,959,524 International equity 1,387,275 1,308,840 Specialty 8,484,888 8,320,880 Money market 439,587 585,039 Other 71,260 74,173 Total $ 28,192,877 27,733,261
Summary of Liabilities for Variable Contract Guarantees	The following table summarizes the liabilities for variable contract guarantees that are reflected in the general account and shown in Account balances and future policy benefit reserves on the Consolidated Balance Sheets: GMDB GMIB GMAB GMWB Totals Balance as of December 31, 2015 $ 97,027 176,465 374,857 2,170,539 2,818,888 Incurred guaranteed benefits 9,845 (17,290 ) (96,596 ) (14,236 ) (118,277 ) Paid guaranteed benefits (17,598 ) (13,942 ) (34,898 ) (69 ) (66,507 ) Balance as of December 31, 2016 89,274 145,233 243,363 2,156,234 2,634,104 Incurred guaranteed benefits 5,492 (35,136 ) (61,660 ) (151,177 ) (242,481 ) Paid guaranteed benefits (12,789 ) (9,999 ) (355 ) (139 ) (23,282 ) Balance as of December 31, 2017 $ 81,977 100,098 181,348 2,004,918 2,368,341

Accident and Health Claim Res48

Accident and Health Claim Reserves (Tables)	12 Months Ended
	Dec. 31, 2017
Activity in Accident and Health Claim Reserves	Activity in the accident and health claim reserves is summarized as follows: 2017 2016 2015 Balance at January 1, net of reinsurance and investment contract recoverables of $396,850, $340,048, and $283,252, respectively $ 196,603 157,321 135,168 Adjustment primarily related to commutation and assumption reinsurance on blocks of business 242 34 323 Incurred related to: Current year 105,873 93,844 71,378 Prior years (5,496 ) 789 (4,275 ) Total incurred 100,377 94,633 67,103 Paid related to: Current year 6,451 5,829 4,331 Prior years 61,917 49,556 40,942 Total paid 68,368 55,385 45,273 Balance at December 31, net of reinsurance and investment contract recoverables of $447,140, $396,850, and $340,048, respectively $ 228,854 196,603 157,321

Mortgage Notes Payable (Tables)

Mortgage Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2017
Future Principal Payments	The future principal payments required under the loan are as follows: 2018 $ 8,758 2019 9,254 2020 9,778 2021 10,332 2022 10,918 2023 and beyond 19,588 Total $ 68,628

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Investments requiring Commitment of Capital	The Company has the following investments that require a commitment of capital for the years ended December 31, 2017 and 2016 : 2017 2016 Limited partnerships (1) $ 320,123 187,484 Private placements 383,675 448,351 Mortgage loans 458,573 414,360 Total $ 1,162,371 1,050,195 (1) Included within this caption are limited partnership investments managed by affiliates of the Company. See note 19 for additional details regarding these investments.
Future Minimum Lease Payments Required under Operating Leases	The future minimum lease payments required under operating leases are as follows: 2018 $ 2,027 2019 1,737 2020 1,310 2021 777 2022 479 2023 and beyond 448 Total $ 6,778

Capital Structure (Tables)

Capital Structure (Tables)	12 Months Ended
	Dec. 31, 2017
Category of Capital Stock Issued	The Company is authorized to issue three types of capital stock, as outlined in the table below: Authorized, issued, and outstanding Par value, per share Redemption rights Voluntary or involuntary liquidation rights Common stock 40,000,000 $1.00 None None 20,000,001 20,000,001 Preferred stock: Class A 200,000,000 $1.00 Designated by Board for each series issued Designated by Board for each series issued 18,903,484 18,903,484 Class A, Series A 8,909,195 $1.00 $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid 8,909,195 8,909,195 Class A, Series B 10,000,000 $1.00 $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid $35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid 9,994,289 9,994,289 Class B 400,000,000 $1.00 Designated by Board for each series issued Designated by Board for each series issued 400,000,000 400,000,000

Accumulated Other Comprehensi52

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
Changes In AOCI By Component	Changes in AOCI, net of tax, by component consist of the following at December 31: 2017 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 1,165,665 (19,206 ) 6,923 (104 ) 1,153,278 OCI before reclassifications 1,001,398 1,223 857 (12 ) 1,003,466 Amounts reclassified from AOCI (43,085 ) (9,313 ) — 8 (52,390 ) Net OCI 958,313 (8,090 ) 857 (4 ) 951,076 Ending balance $ 2,123,978 (27,296 ) 7,780 (108 ) 2,104,354 2016 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1)(2) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 472,376 10,408 6,231 (65 ) 488,950 OCI before reclassifications 667,048 (22,227 ) 692 (42 ) 645,471 Amounts reclassified from AOCI 26,241 (7,387 ) — 3 18,857 Net OCI 693,289 (29,614 ) 692 (39 ) 664,328 Ending balance $ 1,165,665 (19,206 ) 6,923 (104 ) 1,153,278 2015 Net unrealized gain (loss) on securities Net gain (loss) on cash flow hedging (1)(2) Foreign currency translation adjustments Pension and postretirement plan adjustments Total AOCI Beginning balance $ 1,765,606 1,475 10,240 (176 ) 1,777,145 OCI before reclassifications (1,263,867 ) 12,311 (4,009 ) 95 (1,255,470 ) Amounts reclassified from AOCI (29,363 ) (3,378 ) — 16 (32,725 ) Net OCI (1,293,230 ) 8,933 (4,009 ) 111 (1,288,195 ) Ending balance $ 472,376 10,408 6,231 (65 ) 488,950 (1) Includes cumulative foreign currency translation losses on the hedged items of $18,704, $79,727, and $27,168 at December 31, 2017, 2016, and 2015, respectively. (2) The previously issued 2016 Consolidated Financial Statements improperly disclosed OCI before reclassifications as $(29,614) and $8,933 for the years ended December 31, 2016 and 2015, respectively. OCI before reclassifications previously included amounts that were reclassified from AOCI of $(7,387) and $(3,378) for the years ended December 31, 2016 and 2015, respectively. The December 31, 2016 and 2015 amounts have been corrected to conform with current year presentation.
Reclassifications From AOCI	Reclassifications from AOCI, net of tax, consist of the following : Amounts reclassified from AOCI Affected line item December 31, in the Consolidated AOCI 2017 2016 2015 Statements of Operations Net unrealized gain (loss) on securities: Available-for-sale securities $ 66,284 (40,370 ) 45,174 Realized investment gains (losses), net Income tax expense (benefit) 23,199 (14,129 ) 15,811 Income tax expense (benefit) Total 43,085 (26,241 ) 29,363 Net gain on cash flow hedging: Effective portion of gains 13,622 11,121 5,197 Interest and similar income, net Ineffective portion of gains 706 243 — Change in fair value of assets and liabilities Income tax expense (benefit) 5,015 3,977 1,819 Income tax expense (benefit) Total 9,313 7,387 3,378 Pension and other postretirement plan adjustments: Amortization of actuarial losses (12 ) (5 ) (25 ) General and administrative expenses Income tax expense (benefit) (4 ) (2 ) (9 ) Income tax expense (benefit) Total (8 ) (3 ) (16 ) Total amounts reclassified from AOCI $ 52,390 (18,857 ) 32,725 Net income

Foreign Currency Translation (T

Foreign Currency Translation (Tables)	12 Months Ended
	Dec. 31, 2017
Foreign Currency Translation, Net of Tax	An analysis of foreign currency translation, net of tax for the respective years ended December 31 is as follows: 2017 2016 2015 Beginning amount of cumulative translation adjustments $ 6,923 6,231 10,240 Aggregate adjustment for the period resulting from translation adjustments 1,318 1,065 (6,168 ) Amount of income tax expense for the period related to aggregate adjustment (461 ) (373 ) 2,159 Net aggregate translation included in equity 857 692 (4,009 ) Ending amount of cumulative translation adjustments $ 7,780 6,923 6,231 Canadian dollar to United States dollar foreign exchange rate at end of year 0.79812 0.74568 0.71989

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Reconciliation of Unconsolidated Segment Results to Consolidated Statement of Operations	Unconsolidated segment results are reconciled to the Consolidated Statements of Operations amounts in the tables below: Year ended December 31, 2017 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,249,793 204,920 — 150,514 — 1,605,227 Interest and similar income, net 4,301,602 135,346 68 85,203 — 4,522,219 Change in fair value of assets and liabilities 3,368,121 233,840 2 505 — 3,602,468 Realized investment gains (losses), net 80,111 2,272 3 1,236 — 83,622 Fee, commission, and other revenue 249,280 1,485 110,989 1,380 (38,404 ) 324,730 Total revenue 9,248,907 577,863 111,062 238,838 (38,404 ) 10,138,266 Benefits and expenses: Net benefits and expenses 6,570,915 350,354 — 207,970 — 7,129,239 General and administrative and commission 1,486,314 219,519 122,989 21,726 (38,404 ) 1,812,144 Change in deferred acquisition costs, net 313,504 (59,168 ) — 20,027 — 274,363 Total benefits and expenses 8,370,733 510,705 122,989 249,723 (38,404 ) 9,215,746 Pretax income (loss) $ 878,174 67,158 (11,927 ) (10,885 ) — 922,520 Year ended December 31, 2016 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,117,580 147,013 — 142,686 — 1,407,279 Interest and similar income, net 4,133,359 113,465 32 78,881 — 4,325,737 Change in fair value of assets and liabilities (218,922 ) 40,600 2 82 — (178,238 ) Realized investment gains (losses), net (49,126 ) 623 — (822 ) — (49,325 ) Fee, commission, and other revenue 243,789 747 101,432 1,191 (37,305 ) 309,854 Total revenue 5,226,680 302,448 101,466 222,018 (37,305 ) 5,815,307 Benefits and expenses: Net benefits and expenses 1,982,879 194,667 — 205,632 — 2,383,178 General and administrative and commission 1,774,740 159,455 114,009 18,489 (37,305 ) 2,029,388 Change in deferred acquisition costs, net 315,760 (69,477 ) — 13,124 — 259,407 Total benefits and expenses 4,073,379 284,645 114,009 237,245 (37,305 ) 4,671,973 Pretax income (loss) $ 1,153,301 17,803 (12,543 ) (15,227 ) — 1,143,334 Year ended December 31, 2015 Individual annuities Life Questar Legacy Eliminations Consolidated Revenue: Premiums and policy fees, net $ 1,133,285 172,660 — 143,646 — 1,449,591 Interest and similar income, net 3,999,693 103,326 3 72,447 — 4,175,469 Change in fair value of assets and liabilities (492,479 ) (38,553 ) — (1,688 ) — (532,720 ) Realized investment gains (losses), net 90,948 1,597 — 1,868 — 94,413 Fee, commission, and other revenue 236,454 186 105,830 253 (39,324 ) 303,399 Total revenue 4,967,901 239,216 105,833 216,526 (39,324 ) 5,490,152 Benefits and expenses: Net benefits and expenses 2,296,057 114,377 — 192,660 — 2,603,094 General and administrative and commission 1,549,692 165,386 110,624 18,059 (39,324 ) 1,804,437 Change in deferred acquisition costs, net 279,582 (53,642 ) — 13,319 — 239,259 Total benefits and expenses 4,125,331 226,121 110,624 224,038 (39,324 ) 4,646,790 Pretax income (loss) $ 842,570 13,095 (4,791 ) (7,512 ) — 843,362

Summary Of Significant Accoun55

Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Investments in limited partnership	$ 63,407	$ 46,727
Recognized tax credits related to partnership investments	13,651	7,125	$ 2,793
FHLB stock held	30,000	30,000
Cash received from FHLB advance	$ 500,000	500,000	500,000
Deferred acquisition costs, amortization period	20 years
Assets held-for-sale recorded in other assets		13,615
Liabilities held-for-sale recorded in other liabilities		2,754
Property and equipment, net of accumulated depreciation	$ 166,260	180,328
Property and equipment, accumulated depreciation	$ 170,150	94,395
LTC reserve interest assumptions range	5.00%
LTC reserve interest assumptions range	6.00%
Increase in statutory surplus due to adopted accounting practice	$ 103,530
Accounting change	There were no accounting changes made by the Company during the year ended
Guaranteed Minimum Death Benefit
Significant Accounting Policies [Line Items]
Cap rate of premium	150.00%
Guaranteed Minimum Death Benefit | With no cap
Significant Accounting Policies [Line Items]
Rollup interest rates	5.00%
Guaranteed Minimum Death Benefit | With a cap of 150% of premium
Significant Accounting Policies [Line Items]
Rollup interest rates	3.00%
Minimum
Significant Accounting Policies [Line Items]
Short Term Securities Comprising of fixed maturity security	3 months
Traditional life products, life reserve interest assumptions range	2.30%
Maximum
Significant Accounting Policies [Line Items]
Short Term Securities Comprising of fixed maturity security	12 months
Traditional life products, life reserve interest assumptions range	6.00%
Preoperating and start-up costs
Significant Accounting Policies [Line Items]
Amortization of capitalized cost	$ 4,394	$ 4,394	$ 4,393
Buildings
Significant Accounting Policies [Line Items]
Estimated Useful Lives used for home office property and equipment	39 years
Home Office Property [Member]
Significant Accounting Policies [Line Items]
Estimated Useful Lives used for home office property and equipment	39 years
Equipment [Member] | Minimum
Significant Accounting Policies [Line Items]
Estimated Useful Lives used for home office property and equipment	2 years
Equipment [Member] | Maximum
Significant Accounting Policies [Line Items]
Estimated Useful Lives used for home office property and equipment	7 years

Amortized Cost or Cost, Gross U

Amortized Cost or Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Values of Available-For-Sale and Held-To-Maturity Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	$ 92,615,161	$ 84,029,645
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	6,517,305	4,363,576
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	327,178	846,250
Total fixed-maturity securities, available-for-sale, Fair value	98,805,288	87,546,971
Total fixed-maturity securities, held-to-maturity, Amortized cost of cost		28
Total fixed-maturity securities, held-to-maturity, Gross unrealized gains		3,602
Total fixed-maturity securities, held-to-maturity, Gross unrealized losses		0
Total fixed-maturity securities, held-to-maturity, Fair value	0	3,630
Equity securities amortized cost	261,073	316,541
Equity securities gross unrealized gain	10,836
Equity securities fair value	271,909	320,166
Available for sale and held-to-maturity securities, Amortized cost or cost	92,876,234	84,346,214
Available for sale and held-to-maturity securities, gross unrealized gains	6,528,141	4,370,803
Available for sale and held-to-maturity securities, gross unrealized losses	327,178	846,250
Available for sale and held-to-maturity securities, fair value	99,077,197	87,870,767
U.S. Government
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	2,449,361	1,712,400
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	15,159	41,003
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	23,066	16,880
Total fixed-maturity securities, available-for-sale, Fair value	2,441,454	1,736,523
Agencies not backed by the full faith and credit of the U.S. government
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	6,692	8,766
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	232	113
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	107	22
Total fixed-maturity securities, available-for-sale, Fair value	6,817	8,857
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	10,177,673	9,379,273
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	1,154,762	612,248
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	14,709	36,908
Total fixed-maturity securities, available-for-sale, Fair value	11,317,726	9,954,613
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	523,356	426,724
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	19,773	21,006
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	2,516	8,803
Total fixed-maturity securities, available-for-sale, Fair value	540,613	438,927
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	65,145,715	60,668,745
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	5,068,907	3,489,117
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	169,349	617,795
Total fixed-maturity securities, available-for-sale, Fair value	70,045,273	63,540,067
Total fixed-maturity securities, held-to-maturity, Amortized cost of cost		28
Total fixed-maturity securities, held-to-maturity, Gross unrealized gains		5
Total fixed-maturity securities, held-to-maturity, Gross unrealized losses		0
Total fixed-maturity securities, held-to-maturity, Fair value		33
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	14,297,121	11,824,876
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	246,150	189,019
Total fixed-maturity securities, available-for-sale, Gross unrealized losses	117,431	165,842
Total fixed-maturity securities, available-for-sale, Fair value	14,425,840	11,848,053
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Total fixed-maturity securities, available-for-sale	15,243	8,861
Total fixed-maturity securities, available-for-sale, Gross unrealized gains	12,322	11,070
Total fixed-maturity securities, available-for-sale, Fair value	27,565	19,931
Total fixed-maturity securities, held-to-maturity, Gross unrealized gains		3,597
Total fixed-maturity securities, held-to-maturity, Gross unrealized losses		0
Total fixed-maturity securities, held-to-maturity, Fair value		3,597
Common stock
Schedule of Available-for-sale Securities [Line Items]
Equity securities amortized cost	259,573	316,541
Equity securities gross unrealized gain	10,836	3,625
Equity securities gross unrealized losses		0
Equity securities fair value	270,409	$ 320,166
Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Equity securities amortized cost	1,500
Equity securities fair value	$ 1,500

Net Unrealized Gains On Availab

Net Unrealized Gains On Available-For-Sale Securities and Effective Portion Of Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Held-for-sale securities	$ 0	$ 614	$ 798
Net unrealized gains (losses)	2,096,682	1,146,460	482,784
Fixed-maturity securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	6,190,127	3,517,326	1,553,935
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	10,836	3,625	(2,394)
Cash flow hedges
Schedule of Available-for-sale Securities [Line Items]
Cash flow hedges	(41,993)	(29,547)	16,013
Shadow
Schedule of Available-for-sale Securities [Line Items]
Shadow adjustments	(3,007,245)	(1,728,234)	(825,607)
Deferred taxes
Schedule of Available-for-sale Securities [Line Items]
Deferred taxes	$ (1,055,043)	$ (617,324)	$ (259,961)

Amortized Cost and Fair Value o

Amortized Cost and Fair Value of Available for Sale Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fixed-maturity securities, available-for-sale:
Due in one year or less, amortized cost	$ 2,218,716
Due after one year through five years, amortized cost	13,236,678
Due after five years through ten years, amortized cost	21,315,386
Due after ten years, amortized cost	40,556,205
Structured securities, amortized cost	15,288,176
Total fixed-maturity securities, available-for-sale	92,615,161	$ 84,029,645
Available-for-sale fixed-maturity securities, fair value
Due in one year or less, fair value	2,249,030
Due after one year through five years, fair value	13,781,829
Due after five years through ten years, fair value	21,909,438
Due after ten years, fair value	45,411,155
Structured securities, fair value	15,453,836
Total fixed-maturity securities, available-for-sale fair value	$ 98,805,288	$ 87,546,971

Investments - Additional Inform

Investments - Additional Information (Detail) $ in Thousands		1 Months Ended	12 Months Ended
		Feb. 28, 2017USD ($)	Dec. 31, 2017USD ($)Investment	Dec. 31, 2016USD ($)Investment		Dec. 31, 2015USD ($)
Schedule of Investments [Line Items]
Carrying value of investments held on deposit with various insurance departments and in other trusts			$ 24,179	$ 28,098
Available-for-sale investment holdings that were in an unrealized loss position for fixed-maturity securities | Investment			865	1,088
Fair value of securities on loan			$ 2,613,073	$ 2,798,597
Collateral held	[1]		2,675,912	2,888,157	[2]
Non Cash collateral received			18,866	326,938
Cash collateral received			2,657,046	2,561,219
Fair value of reverse repurchase agreements			860,800	100,000
Fair value of reverse repurchase agreements, collateral			864,279	100,000
Realized investment gain upon initial consolidation						$ 31,832
Available-for-sale, at fair value			98,805,288	87,546,971
Notes payable			68,628	76,916
Sale of investments		$ 16,540
Loss on sale of investments		$ 1,541	85,171	(47,558)		$ 80,225
Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Available-for-sale, at fair value				19,833
Collateralized debt obligations
Schedule of Investments [Line Items]
Available-for-sale, at fair value			$ 27,565	19,931
Collateralized debt obligations | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Other invested assets				43,640
Available-for-sale, at fair value				10,604
Junior tranche Notes
Schedule of Investments [Line Items]
Notes payable				$ 565
Minimum
Schedule of Investments [Line Items]
Interest rates on investments in new mortgage loans			3.40%	3.00%
Maximum
Schedule of Investments [Line Items]
Interest rates on investments in new mortgage loans			4.90%	4.60%
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Unrealized gain loss on investment grade securities			$ 303,565	$ 763,051
Percentage of unrealized loss			92.80%	90.20%
[1]	There is no contractual maturity on the lending agreements. The related loaned security could be returned to the Company on the next business day with notice from the counterparty and the Company would be required to return the collateral immediately.
[2]	The previously issued 2016 Consolidated Financial Statements disclosed only the cash collateral received by loaned security type. These amounts have been updated to conform with current year presentation to include noncash and cash collateral received by loaned security type.

Unrealized Losses on Available-

Unrealized Losses on Available-for-Sale Securities and Related Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	$ 9,379,369	$ 20,023,201
Unrealized losses, 12 months or less	75,059	652,110
Fair value, greater than 12 months	7,057,347	2,145,077
Unrealized losses, greater than 12 months	252,119	194,140
Fair value, total	16,436,716	22,168,278
Unrealized losses, total	327,178	846,250
U.S. Government
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	1,583,775	691,559
Unrealized losses, 12 months or less	9,319	16,880
Fair value, greater than 12 months	472,276	0
Unrealized losses, greater than 12 months	13,747	0
Fair value, total	2,056,051	691,559
Unrealized losses, total	23,066	16,880
US Government Agency
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	4,357	3,332
Unrealized losses, 12 months or less	107	22
Fair value, greater than 12 months	0	0
Unrealized losses, greater than 12 months	0	0
Fair value, total	4,357	3,332
Unrealized losses, total	107	22
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	221,614	1,587,063
Unrealized losses, 12 months or less	2,612	30,524
Fair value, greater than 12 months	250,963	103,316
Unrealized losses, greater than 12 months	12,097	6,384
Fair value, total	472,577	1,690,379
Unrealized losses, total	14,709	36,908
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	81,717	99,527
Unrealized losses, 12 months or less	830	6,634
Fair value, greater than 12 months	35,805	10,383
Unrealized losses, greater than 12 months	1,686	2,169
Fair value, total	117,522	109,910
Unrealized losses, total	2,516	8,803
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	4,053,797	12,637,792
Unrealized losses, 12 months or less	37,776	433,682
Fair value, greater than 12 months	3,507,087	2,000,338
Unrealized losses, greater than 12 months	131,573	184,113
Fair value, total	7,560,884	14,638,130
Unrealized losses, total	169,349	617,795
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair value,12 months or less	3,434,109	5,003,928
Unrealized losses, 12 months or less	24,415	164,368
Fair value, greater than 12 months	2,791,216	31,040
Unrealized losses, greater than 12 months	93,016	1,474
Fair value, total	6,225,325	5,034,968
Unrealized losses, total	$ 117,431	$ 165,842

Cumulative Credit Impairments o

Cumulative Credit Impairments on Fixed-maturity Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Than Temporary Impairment Losses Recognized [Line Items]
Beginning Balance	$ 115,430	$ 59,365
Additions for credit impairments recognized on:
Securities not previously impaired	48,574	174,823
Reductions for credit impairments previously on:
Securities that matured, were sold, or were liquidated during the period	(111,956)	(118,758)
Ending Balance	$ 52,048	$ 115,430

Gross and Net Realized Investme

Gross and Net Realized Investment (Losses) Gains (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment gains/losses [Line Items]
Net gains (losses) on available-for-sale securities	$ 70,061	$ (42,469)	$ 35,042
Gross gains on sales and exchanges	4,244		31,832
Gross losses on sales and exchanges	(11)	(11)	(11)
Net gains (losses) on held-to-maturity securities	4,233	(11)	31,821
Gain on real estate sales			5,929
Other	9,328	(6,845)	21,621
Net realized investment gains (losses)	83,622	(49,325)	94,413
Fixed-maturity securities
Investment gains/losses [Line Items]
Gross gains on sales	151,815	198,851	108,094
Gross losses on sales	(37,415)	(71,002)	(15,272)
OTTI	(48,574)	(172,530)	(57,598)
Net gains (losses) on available-for-sale securities	65,826	(44,681)	35,224
Equity securities
Investment gains/losses [Line Items]
Gross gains on sales	5,289	3,109	2
Gross losses on sales	(1,054)	(897)	(184)
Net gains (losses) on equity securities	$ 4,235	$ 2,212	$ (182)

Proceeds from Sale of Available

Proceeds from Sale of Available-for-Sale and Trading Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fixed-maturity securities
Available-for-sale:
Proceeds from sales	$ 2,567,050	$ 2,177,408	$ 996,801
Equity securities
Available-for-sale:
Proceeds from sales	$ 136,911	$ 152,821	$ 58,858

Portion of Trading Gains and Lo

Portion of Trading Gains and Losses Related to Trading Securities Still Held at the Reporting Date (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Investment Income [Line Items]
Net gains (losses) recognized during the period on trading securities	$ 21,109	$ 12,133	$ (17,268)
Less: Net gains (losses) recognized during the period on trading securities sold during the period	7,738	(2,205)	576
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date	$ 13,371	$ 14,338	$ (17,844)

Major Categories of Interest an

Major Categories of Interest and Similar Income, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and Other Income [Line Items]
Held-to-maturity fixed-maturity securities	$ 58	$ 1,012	$ 5,746
Mortgage loans on real estate	559,236	470,547	413,103
Derivative assets	13,622	11,121	5,197
Loans to affiliates	625	384	516
Policy loans	9,794	10,015	9,834
Fair value option and trading equity securities	10,647	6,814	11,838
Other invested assets	13,977	32,857	32,618
Short-term securities and cash and cash equivalents	27,878	13,896	8,761
Total	4,610,736	4,405,232	4,241,896
Less: Investment expenses	88,517	79,495	66,427
Total interest and similar income, net	4,522,219	4,325,737	4,175,469
Fixed-maturity securities
Interest and Other Income [Line Items]
Available-for-sale securities	3,968,147	3,847,272	3,752,867
Equity securities
Interest and Other Income [Line Items]
Available-for-sale securities	$ 6,752	$ 11,314	$ 1,416

Outstanding Balance and Carryin

Outstanding Balance and Carrying Amount of Fixed-maturity Securities Purchased with Deteriorated Credit Quality (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Fixed-maturity securities, available-for-sale:
Outstanding balance	$ 301,715	$ 261,260
Carrying amount	$ 183,045	$ 139,863

Activity for the Accretable Yie

Activity for the Accretable Yield on Fixed-maturity Securities Purchased with Deteriorated Credit Quality (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fixed-maturity securities, available-for-sale:
Balance, beginning of year	$ 102,221	$ 135,075
Additions	11,487	0
Accretion	(11,687)	(19,798)
Reclassifications from nonaccretable difference	(4,024)	(4,805)
Disposals	0	(8,251)
Balance, end of year	$ 97,997	$ 102,221

Fixed-maturity Securities Acqui

Fixed-maturity Securities Acquired with Probability at Acquisition that All Contractually Required Payments Would not be Collected (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2015
Fixed-maturity securities, available-for-sale:
Contractually required payments receivable	$ 69,695	$ 99,975
Cash flows expected to be collected	55,425	65,489
Basis in acquired securities	$ 43,938	$ 39,823

Investment in Mortgage Loans on

Investment in Mortgage Loans on Real Estate (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Time Deposits [Line Items]
Concentration Amount		$ 11,761,939	$ 10,351,741
Mortgage Loans on Real Estate | CALIFORNIA
Time Deposits [Line Items]
Concentration Amount		$ 2,951,697	$ 2,925,356
Concentration %		25.00%	28.10%
Mortgage Loans on Real Estate | ILLINOIS
Time Deposits [Line Items]
Concentration Amount	[1]		$ 1,085,445
Concentration %	[1]		10.40%
[1]	Mortgage loans on real estate in Illinois did not exceed 10% of the Company's mortgage loan portfolio in 2017.

Schedule of Cash Collateral Lia

Schedule of Cash Collateral Liability By Loaned Security Type (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Remaining Contractual Maturity of the Agreements Open	[1]	$ 2,675,912	$ 2,888,157	[2]
Collateral held from securities lending agreements		2,657,046	2,561,219
Cash and Cash Equivalents
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral held from securities lending agreements		1,668,868	1,445,249
Short-term Investments
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral held from securities lending agreements		988,178	1,115,970
Foreign government
Financial Instruments Owned and Pledged as Collateral [Line Items]
Remaining Contractual Maturity of the Agreements Open	[1]	25,788	10,551	[2]
Corporate securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Remaining Contractual Maturity of the Agreements Open	[1]	$ 2,650,124	$ 2,877,606	[2]
[1]	There is no contractual maturity on the lending agreements. The related loaned security could be returned to the Company on the next business day with notice from the counterparty and the Company would be required to return the collateral immediately.
[2]	The previously issued 2016 Consolidated Financial Statements disclosed only the cash collateral received by loaned security type. These amounts have been updated to conform with current year presentation to include noncash and cash collateral received by loaned security type.

Investments - VIE (Detail)

Investments - VIE (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Carrying Amount		$ 15,532,066	$ 13,029,860
Maximum Exposure	[1]	15,841,475	13,312,269
Available-for-sale securities, equity
Variable Interest Entity [Line Items]
Carrying Amount		15,453,836	12,824,558
Maximum Exposure	[1]	15,453,836	12,824,558
Available-for-sale securities, equity | Corporate securities
Variable Interest Entity [Line Items]
Carrying Amount		1,000,431	981,066
Maximum Exposure	[1]	1,000,431	981,066
Available-for-sale securities, equity | Mortgage-backed securities
Variable Interest Entity [Line Items]
Carrying Amount		14,425,840	11,823,561
Maximum Exposure	[1]	14,425,840	11,823,561
Available-for-sale securities, equity | Collateralized debt obligations
Variable Interest Entity [Line Items]
Carrying Amount		27,565	19,931
Maximum Exposure	[1]	27,565	19,931
Other Assets
Variable Interest Entity [Line Items]
Carrying Amount		78,230	205,302
Maximum Exposure	[1]	$ 387,639	$ 487,711
[1]	(1) The maximum exposure to loss is equal to the carrying amount for Fixed-maturity securities, available-for-sale. The maximum exposure to loss related to Other invested assets is equal to the carrying amount plus any unfunded commitments.

Components of Gains or Losses R

Components of Gains or Losses Related to Derivatives that Qualify as Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (69,113)	$ 22,945	$ 28,262
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, net of tax			(617)
Foreign Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, net of tax	$ (69,113)	$ 22,945	$ 28,879

Components of Gains or Losses73

Components of Gains or Losses Related to Derivatives that Qualify as Cash Flow Hedges (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, tax (benefit) expense	$ 0	$ 0	$ 332
Foreign Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, tax (benefit) expense	$ 37,215	$ (12,355)	$ (15,550)

Amount of gains reclassified fr

Amount of gains reclassified from AOCI into earnings on the effective and ineffective portion of the derivatives (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and Similar Income, Net
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 8,854	$ 7,229	$ 3,378
Change in Fair Value of Assets and Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, Total	459	158
Foreign Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, net of tax	(69,113)	22,945	28,879
Foreign Currency Swap | Interest and Similar Income, Net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, net of tax	8,854	7,229	$ 3,378
Foreign Currency Swap | Change in Fair Value of Assets and Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative swaps, Total	$ 459	$ 158

Amount of gains reclassified 75

Amount of gains reclassified from AOCI into earnings on the effective and ineffective portion of the derivatives (Parenthetical) (Detail) - Foreign Currency Swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and Similar Income, Net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains reclassified from AOCI into earnings, tax	$ 4,768	$ 3,892	$ 1,819
Change in Fair Value of Assets and Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains reclassified from AOCI into earnings, tax	$ 247	$ 85	$ 0

Derivatives and Hedging Instr76

Derivatives and Hedging Instruments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net of Tax	$ 11,813
Maximum Amount of Time Cash Flow are Hedged	16 years
Over the Counter
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total collateral for derivatives	$ 2,029,211	$ 1,447,970
Exchange Traded
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total collateral for derivatives	$ 137,383	$ 49,133

Schedule of Derivative (Detail)

Schedule of Derivative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Amount	$ 175,800	$ 331,400
Fair Value	(1,498)	367
Fitch, BBB+ Rating [Member]
Derivatives, Fair Value [Line Items]
Amount	175,800	331,400
Fair Value	$ (1,498)	$ 367
Weighted Average Years to Maturity	6 years	6 years

Derivatives and Hedging Instr78

Derivatives and Hedging Instruments - Summary of Aggregate Notional Amounts and Fair Values (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional		$ 175,800	$ 331,400
Gross Fair Value of Assets		1,386,720	1,057,168
Gross Fair Value of Liabilities		(913,107)	(635,634)
Designated as Hedging Instrument | Cash flow hedges
Derivative [Line Items]
Gross Fair Value of Assets		38,939	96,975
Gross Fair Value of Liabilities		(68,354)	(11,731)
Designated as Hedging Instrument | Cash flow hedges | Foreign Currency Swap
Derivative [Line Items]
Notional	[1]	899,000	676,000
Gross Fair Value of Assets		38,939	96,975
Gross Fair Value of Liabilities		(68,354)	(11,731)
Not Designated as Hedging Instrument
Derivative [Line Items]
Gross Fair Value of Assets		1,347,781	960,193
Gross Fair Value of Liabilities		(844,753)	(623,903)
Not Designated as Hedging Instrument | Future
Derivative [Line Items]
Notional	[1]	27,891,125	17,574,373
Not Designated as Hedging Instrument | Exchange Traded Options
Derivative [Line Items]
Notional	[1]	17,033,569	11,109,074
Gross Fair Value of Assets		48,177	42,400
Gross Fair Value of Liabilities		(27,678)	(27,345)
Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional	[1]	3,763,500	7,227,500
Gross Fair Value of Assets		130,476	144,384
Gross Fair Value of Liabilities		(162)	(77,799)
Not Designated as Hedging Instrument | Total Return Swap
Derivative [Line Items]
Notional	[1]	2,944,000	7,154,000
Gross Fair Value of Assets		12,375	5,826
Gross Fair Value of Liabilities			(3,702)
Not Designated as Hedging Instrument | TBA Securities
Derivative [Line Items]
Notional	[1]	1,474,100	693,900
Gross Fair Value of Assets		4	833
Gross Fair Value of Liabilities		(953)	(299)
Not Designated as Hedging Instrument | Stock Appreciation Rights (SARs)
Derivative [Line Items]
Notional	[1],[2]		7,422
Gross Fair Value of Assets			545
Not Designated as Hedging Instrument | Over the Counter
Derivative [Line Items]
Notional	[1]	119,817,491	77,973,809
Gross Fair Value of Assets		1,156,749	766,205
Gross Fair Value of Liabilities		$ (815,960)	$ (514,758)
[1]	Notional amounts are presented on a gross basis.
[2]	The notional amount for SAR is equal to the number of contracts outstanding.

Derivatives and Hedging Instr79

Derivatives and Hedging Instruments - Fair Value of Embedded Derivatives (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Embedded Derivative [Line Items]
Total embedded derivative instruments	$ (22,324,263)	$ (17,539,216)
Guaranteed Minimum Withdrawal Benefit
Embedded Derivative [Line Items]
Total embedded derivative instruments	(2,004,918)	(2,156,234)
Guaranteed Minimum Accumulation Benefit
Embedded Derivative [Line Items]
Total embedded derivative instruments	(181,348)	(243,363)
MVLO
Embedded Derivative [Line Items]
Total embedded derivative instruments	(20,137,427)	(15,141,482)
Other Embedded Derivative Financial Instruments
Embedded Derivative [Line Items]
Total embedded derivative instruments	$ (570)	$ 1,863

Gains or Losses Recognized in I

Gains or Losses Recognized in Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Change in fair value of annuity and life embedded derivatives	$ (4,962,770)	$ (275,808)	$ (588,595)
Premiums and policy fees, net	1,605,227	1,407,279	1,449,591
Change in fair value of assets and liabilities	(816,610)	(576,255)	(893,943)
Policyholder benefits, net of recoveries	361,285	472,611	531,615
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	3,966,500	(40,986)	(501,036)
Not Designated as Hedging Instrument | MVLO
Derivatives, Fair Value [Line Items]
Change in fair value of annuity and life embedded derivatives	(5,175,605)	(386,709)	212,758
Premiums and policy fees, net	9,911	(398,942)	79,951
Policyholder benefits, net of recoveries	169,749	139,481	115,737
Not Designated as Hedging Instrument | Future
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	2,362,617	(287,724)	(423,134)
Not Designated as Hedging Instrument | Exchange Traded Options
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	54,103	13,055	291
Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	127,777	87,380	279,158
Not Designated as Hedging Instrument | Credit Default Swaps [Member]
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	2,074	4,689	(2,220)
Not Designated as Hedging Instrument | Total Return Swap
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	48,228	(37,143)	4,093
Not Designated as Hedging Instrument | TBA Securities
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	4,078	(2,837)	330
Not Designated as Hedging Instrument | Stock Appreciation Rights (SARs)
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	100	(54)	630
Not Designated as Hedging Instrument | Other Embedded Derivative Financial Instruments
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	(8,120)	(1,234)	1,235
Not Designated as Hedging Instrument | Guaranteed Minimum Withdrawal Benefit
Derivatives, Fair Value [Line Items]
Change in fair value of annuity and life embedded derivatives	151,177	14,235	(679,259)
Not Designated as Hedging Instrument | Guaranteed Minimum Accumulation Benefit
Derivatives, Fair Value [Line Items]
Change in fair value of annuity and life embedded derivatives	61,658	96,666	(122,094)
Not Designated as Hedging Instrument | Over the Counter
Derivatives, Fair Value [Line Items]
Change in fair value of assets and liabilities	$ 1,375,643	$ 182,882	$ (361,419)

Derivative Assets And Liabiliti

Derivative Assets And Liabilities Subject To Enforceable Master Netting Arrangement (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross amounts recognized, derivatives assets		$ 1,386,720	$ 1,057,168
Net amounts presented in the balance sheet, derivatives assets		1,388,190	1,059,031
Gross amounts recognized, derivatives liabilities		(913,107)	(635,634)
Net amounts presented in the balance sheet, derivatives liabilities		(915,147)	(635,634)
Gross amounts recognized, net derivatives		(1,498)	367
Derivative Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross amounts recognized, derivatives assets		1,386,720	1,056,623
Gross amounts offset in the balance sheet, derivatives assets		0	0
Net amounts presented in the balance sheet, derivatives assets		1,386,720	1,056,623
Gross amounts not offset in the balance sheet, financial instruments, derivative assets	[1]	(855,461)	(615,349)
Gross amounts not offset in the balance sheet, collateral pledged/received		(485,646)	(395,913)
Net amount, derivatives assets		45,613	45,361
Derivative liability
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross amounts recognized, derivatives liabilities		(913,107)	(635,634)
Gross amounts offset in the balance sheet, derivatives liabilities		0	0
Net amounts presented in the balance sheet, derivatives liabilities		(913,107)	(635,634)
Gross amounts not offset in the balance sheet, financial instruments, derivative liabilities	[1]	855,461	615,349
Gross amounts not offset in the balance sheet, collateral pledged/received		134,000	37,092
Net amount, derivatives liabilities		76,354	16,807
Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross amounts recognized, net derivatives		473,613	420,989
Net amounts presented in the balance sheet, net derivatives		473,613	420,989
Gross amounts not offset in the balance sheet, collateral pledged/received		(351,646)	(358,821)
Net amount		$ 121,967	$ 62,168
[1]	(1) Represents the amount of assets or liabilities that could be offset by liabilities or assets with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Assets
Fixed-maturity securities, trading		$ 36,219	$ 37,051
Derivative assets		1,388,190	1,059,031
Equity securities, available-for-sale		271,909	320,166
Fixed-maturity securities, available-for-sale		98,805,288	87,546,971
Equity securities, fair value option and trading		314,370	317,493
Separate account assets		28,192,877	27,733,261
Total assets		129,008,853	117,013,973
Liabilities
Derivative liabilities		(915,147)	(635,634)
Reserves at fair value	[1]	(27,387,975)	(20,152,641)
Total liabilities		(28,303,122)	(20,788,275)
U.S. Government
Assets
Fixed-maturity securities, available-for-sale		2,441,454	1,736,523
Agencies not backed by the full faith and credit of the U.S. government
Assets
Fixed-maturity securities, available-for-sale		6,817	8,857
States and political subdivisions
Assets
Fixed-maturity securities, available-for-sale		11,317,726	9,954,613
Foreign government
Assets
Fixed-maturity securities, available-for-sale		540,613	438,927
Corporate securities
Assets
Fixed-maturity securities, available-for-sale		70,045,273	63,540,067
Mortgage-backed securities
Assets
Fixed-maturity securities, available-for-sale		14,425,840	11,848,053
Collateralized debt obligations
Assets
Fixed-maturity securities, available-for-sale		27,565	19,931
Fair Value, Inputs, Level 1
Assets
Fixed-maturity securities, trading		30,901	36,901
Derivative assets		48,177	42,400
Equity securities, available-for-sale		258,095	320,166
Equity securities, fair value option and trading		288,098	298,481
Separate account assets		28,192,877	27,733,261
Total assets		31,259,602	30,167,732
Liabilities
Derivative liabilities		(27,678)	(27,345)
Total liabilities		(27,678)	(27,345)
Fair Value, Inputs, Level 1 | U.S. Government
Assets
Fixed-maturity securities, available-for-sale		2,441,454	1,736,523
Fair Value, Inputs, Level 2
Assets
Fixed-maturity securities, trading		5,168
Derivative assets		1,327,638	1,010,805
Equity securities, fair value option and trading		26,272	19,012
Total assets		86,677,709	78,166,147
Liabilities
Derivative liabilities		(887,469)	(604,587)
Total liabilities		(887,469)	(604,587)
Fair Value, Inputs, Level 2 | Agencies not backed by the full faith and credit of the U.S. government
Assets
Fixed-maturity securities, available-for-sale		6,817	8,857
Fair Value, Inputs, Level 2 | States and political subdivisions
Assets
Fixed-maturity securities, available-for-sale		11,276,965	9,925,338
Fair Value, Inputs, Level 2 | Foreign government
Assets
Fixed-maturity securities, available-for-sale		507,166	404,687
Fair Value, Inputs, Level 2 | Corporate securities
Assets
Fixed-maturity securities, available-for-sale		59,074,307	54,990,599
Fair Value, Inputs, Level 2 | Mortgage-backed securities
Assets
Fixed-maturity securities, available-for-sale		14,425,811	11,806,849
Fair Value, Inputs, Level 2 | Collateralized debt obligations
Assets
Fixed-maturity securities, available-for-sale		27,565
Fair Value, Inputs, Level 3
Assets
Fixed-maturity securities, trading		150	150
Derivative assets		12,375	5,826
Equity securities, available-for-sale		13,814
Total assets		11,071,542	8,680,094
Liabilities
Derivative liabilities			(3,702)
Reserves at fair value	[1]	(27,387,975)	(20,152,641)
Total liabilities		(27,387,975)	(20,156,343)
Fair Value, Inputs, Level 3 | States and political subdivisions
Assets
Fixed-maturity securities, available-for-sale		40,761	29,275
Fair Value, Inputs, Level 3 | Foreign government
Assets
Fixed-maturity securities, available-for-sale		33,447	34,240
Fair Value, Inputs, Level 3 | Corporate securities
Assets
Fixed-maturity securities, available-for-sale		10,970,966	8,549,468
Fair Value, Inputs, Level 3 | Mortgage-backed securities
Assets
Fixed-maturity securities, available-for-sale		$ 29	41,204
Fair Value, Inputs, Level 3 | Collateralized debt obligations
Assets
Fixed-maturity securities, available-for-sale			$ 19,931
[1]	Reserves at fair value are reported in Account balances and future policy benefit reserves on the Consolidated Balance Sheets.

Reconciliation of the Beginning

Reconciliation of the Beginning and Ending Balances for the Company's Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Available-for-sale securities, equity
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Other comprehensive income (loss)		$ 1,496
Purchases and issuances		12,318
Balance, end of year		13,814
Available-for-sale securities, equity | States and political subdivisions
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		29,275	$ 499
Other comprehensive income (loss)		1,482	790
Purchases and issuances		10,004	27,986
Balance, end of year		40,761	29,275
Available-for-sale securities, equity | Foreign government
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		34,240	33,373
Other comprehensive income (loss)		(793)	867
Balance, end of year		33,447	34,240
Available-for-sale securities, equity | Corporate securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		8,549,468	7,021,597
Net income (loss)		(9,227)	(86,539)
Other comprehensive income (loss)		310,320	272,556
Purchases and issuances		2,660,329	2,054,111
Sales and settlements		(444,638)	(428,407)
Transfer out of Level 3		(95,286)	(283,850)
Balance, end of year		10,970,966	8,549,468
Gains (losses) included in net income related to financial instruments still held at the end of the year	[1]	956	(80,134)
Available-for-sale securities, equity | Mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		41,204	54,906
Net income (loss)		678	1,393
Other comprehensive income (loss)		1,279	302
Purchases and issuances			730
Sales and settlements		(24,556)	(16,127)
Transfer out of Level 3		(18,576)	0
Balance, end of year		29	41,204
Available-for-sale securities, equity | Collateralized debt obligations
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		19,931	21,164
Net income (loss)		11,139	0
Other comprehensive income (loss)		(11,070)	(503)
Sales and settlements		(20,000)	(730)
Balance, end of year		0	19,931
Reserves at Fair Value
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year	[1]	(20,152,641)	(18,096,009)
Net income (loss)	[1]	(5,550,779)	(649,516)
Purchases and issuances	[1]	(3,186,229)	(2,805,725)
Sales and settlements	[1]	1,501,674	1,398,609
Balance, end of year	[1]	(27,387,975)	(20,152,641)
Gains (losses) included in net income related to financial instruments still held at the end of the year	[1]	(5,550,779)	(649,516)
Trading Securities | Corporate securities
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		150
Purchases and issuances			150
Balance, end of year		150	150
Derivative Assets
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		5,826	2,350
Net income (loss)		188,230	553,778
Sales and settlements		(181,681)	(550,302)
Balance, end of year		12,375	5,826
Gains (losses) included in net income related to financial instruments still held at the end of the year	[1]	6,549	3,476
Derivative liability
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, beginning of year		(3,702)	(33,812)
Net income (loss)		(101,030)	(583,731)
Sales and settlements		104,732	613,841
Balance, end of year			(3,702)
Gains (losses) included in net income related to financial instruments still held at the end of the year	[1]	$ 3,702	$ (30,111)
[1]	The Company classifies realized and unrealized gains (losses) on Reserves at fair value as unrealized gains (losses) for purposes of disclosure in this table because the Company monitors Reserves at fair value as a whole unit and does not track realized gains (losses) on a contract-by-contract basis.

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets transfers into Level 3	$ 0	$ 0
Assets transfers out of Level 3	$ 113,862	$ 283,850

Assets and Liabilities Measur85

Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale securities, equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 13,814
Available-for-sale securities, equity | Common stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 12,314
Valuation Technique		Consensus pricing
Common stock, Indicative Quotes		$ 23.65
Available-for-sale securities, equity | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 1,500
Valuation Technique		Cost
Available-for-sale securities, equity | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 40,761	$ 29,275	$ 499
Valuation Technique		Discounted cash flow	Discounted cash flow
Unobservable Input, Option adjusted spread		161	166
Available-for-sale securities, equity | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 33,447	$ 34,240	33,373
Valuation Technique		Discounted cash flow	Discounted cash flow
Available-for-sale securities, equity | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 10,970,966	$ 8,549,468	7,021,597
Valuation Technique		Discounted cash flow	Discounted cash flow
Available-for-sale securities, equity | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 29	$ 41,204	54,906
Valuation Technique		Third-party vendor	Third-party vendor
Available-for-sale securities, equity | Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 0	$ 19,931	21,164
Valuation Technique			Third-party vendor
Reserves at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value	[1]	(27,387,975)	$ (20,152,641)	(18,096,009)
Reserves at Fair Value | MVLO
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ (20,137,427)	$ (15,141,482)
Valuation Technique		Discounted cash flow	Discounted cash flow
Reserves at Fair Value | GMWB and GMAB
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ (2,186,266)	$ (2,399,597)
Valuation Technique		Discounted cash flow	Discounted cash flow
Trading Securities | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 150	$ 150
Valuation Technique		Cost	Cost
Derivative Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 12,375	$ 5,826	2,350
Derivative Assets | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates	[2]	0.00%	0.00%
Derivative Assets | Total Return Swap | Third Party Pricing Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ 12,375	$ 5,826
Valuation Technique		Third-Party Vendor	Third-party vendor
Derivative liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value			$ (3,702)	$ (33,812)
Derivative liability | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates	[2]	0.00%	0.00%
Derivative liability | Total Return Swap | Third Party Pricing Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value			$ (3,702)
Valuation Technique		Third-Party Vendor	Third-party vendor
Variable-indexed annuity | Reserves at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value		$ (5,064,282)	$ (2,611,562)
Valuation Technique		Contract value	Contract value
Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Annuitizations		2.30%
Minimum | Available-for-sale securities, equity | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		42	62
Minimum | Available-for-sale securities, equity | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		27	214
Minimum | Reserves at Fair Value | MVLO
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Annuitizations		0.00%	0.00%
Unobservable Input, Surrenders		0.00%	0.00%
Unobservable Input, Mortality		0.00%	0.00%
Unobservable Input, Withdrawal Benefit Election		0.00%	0.00%
Minimum | Reserves at Fair Value | GMWB and GMAB
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Surrenders		0.50%	0.50%
Unobservable Input, Mortality		0.00%	0.00%
Minimum | Derivative Assets | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
Minimum | Derivative liability | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Annuitizations		6.00%
Maximum | Available-for-sale securities, equity | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		50	75
Maximum | Available-for-sale securities, equity | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		515	2,112
Maximum | Reserves at Fair Value | MVLO
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Annuitizations		25.00%	25.00%
Unobservable Input, Surrenders		25.00%	25.00%
Unobservable Input, Mortality		100.00%	100.00%
Unobservable Input, Withdrawal Benefit Election		50.00%	50.00%
Maximum | Reserves at Fair Value | GMWB and GMAB
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Surrenders		35.00%	35.00%
Unobservable Input, Mortality		100.00%	100.00%
Maximum | Derivative Assets | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
Maximum | Derivative liability | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
Weighted Average | Available-for-sale securities, equity | Common stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Common stock, Indicative Quotes		$ 23.65
Weighted Average | Available-for-sale securities, equity | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		161	166
Weighted Average | Available-for-sale securities, equity | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		48	70
Weighted Average | Available-for-sale securities, equity | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Option adjusted spread		130	147
Weighted Average | Derivative Assets | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
Weighted Average | Derivative liability | Total Return Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Unobservable Input, Spread and discount rates		0.00%	0.00%
[1]	The Company classifies realized and unrealized gains (losses) on Reserves at fair value as unrealized gains (losses) for purposes of disclosure in this table because the Company monitors Reserves at fair value as a whole unit and does not track realized gains (losses) on a contract-by-contract basis.
[2]	** Management does not have insight into the specific assumptions used. See narrative below for qualitative discussion.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Financial assets, Carrying amount:
Held-to-maturity fixed-maturity securities			$ 28
Mortgage loans on real estate		$ 11,761,939	10,351,741
Loans to affiliates		39,120	39,120
Policy loans		184,409	171,012
Other invested assets		302,216	357,210
Cash equivalents		1,442,057	1,250,015
Receivables		123,110	144,180
Reinsurance and investment contract recoverables		1,248,634	933,074
Collateral held from securities lending agreements		2,657,046	2,561,219
COLI	[1]	578,951	338,092
Financial liabilities, Carrying amount:
Investment contracts		(79,019,361)	(77,305,738)
Mortgage notes payable		(68,628)	(76,916)
Securities lending payable		(2,657,046)	(2,561,219)
Other liabilities		(123,110)	(144,180)
Separate account liabilities	[1]	(28,192,877)	(27,733,261)
Financial assets, Fair value:
Held-to-maturity fixed-maturity securities		0	3,630
Mortgage loans on real estate		12,372,775	10,900,205
Loans to affiliates		39,120	39,120
Policy loans		184,409	171,012
Other invested assets		302,216	426,137
Cash equivalents		1,442,057	1,250,015
Receivables		123,110	144,180
Reinsurance and investment contract recoverables		1,298,499	987,327
Collateral held from securities lending agreements		2,657,221	2,561,985
COLI	[1]	578,951	338,092
Financial liabilities, Fair value:
Investment contracts		(79,519,680)	(78,018,770)
Mortgage notes payable		(77,637)	(87,981)
Securities lending payable		(2,657,046)	(2,561,219)
Other liabilities		(123,110)	(144,180)
Separate account liabilities	[1]	(28,192,877)	(27,733,261)
Fair Value, Inputs, Level 1
Financial assets, Fair value:
Other invested assets		196,672
Cash equivalents		581,257	1,150,015
Financial liabilities, Fair value:
Separate account liabilities	[1]	(28,192,877)	(27,733,261)
Fair Value, Inputs, Level 2
Financial assets, Fair value:
Policy loans		184,409	171,012
Cash equivalents		860,800	100,000
Collateral held from securities lending agreements		2,657,221	2,561,985
COLI	[1]	578,951	338,092
Financial liabilities, Fair value:
Securities lending payable		(2,657,046)	(2,561,219)
Fair Value, Inputs, Level 3
Financial assets, Fair value:
Held-to-maturity fixed-maturity securities			3,630
Mortgage loans on real estate		12,372,775	10,900,205
Loans to affiliates		39,120	39,120
Other invested assets		105,544	426,137
Receivables		123,110	144,180
Reinsurance and investment contract recoverables		1,298,499	987,327
Financial liabilities, Fair value:
Investment contracts		(79,519,680)	(78,018,770)
Mortgage notes payable		(77,637)	(87,981)
Other liabilities		$ (123,110)	$ (144,180)
[1]	The previously issued 2016 Consolidated Financial Statements improperly disclosed COLI and Separate account liabilities as financial instruments measured at fair value on a recurring basis. These financial instruments have been corrected in the above table to conform with current year presentation as they are carried at other than fair value.

Loan-to-Value and Debt Service

Loan-to-Value and Debt Service Coverage Ratio Analysis (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 11,890,073	$ 10,482,229
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 11,798,939	$ 10,400,141
Mortgage loan, loan to value percentage	100.00%	100.00%
Mortgage Receivable | Less than 50%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 3,926,527	$ 3,881,807
Mortgage loan, loan to value percentage	33.30%	37.30%
Mortgage Receivable | 50% To 60%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 4,508,206	$ 3,956,717
Mortgage loan, loan to value percentage	38.20%	38.00%
Mortgage Receivable | 60% To 70%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 3,119,921	$ 2,015,141
Mortgage loan, loan to value percentage	26.40%	19.40%
Mortgage Receivable | 70% To 80%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 244,285	$ 375,670
Mortgage loan, loan to value percentage	2.10%	3.60%
Mortgage Receivable | 80% To 90%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		$ 170,806
Mortgage loan, loan to value percentage		1.70%
Mortgage Receivable | Greater than 1.4x
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 10,473,247	$ 9,134,038
Mortgage Receivable | Greater than 1.4x | Less than 50%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	3,742,536	3,694,757
Mortgage Receivable | Greater than 1.4x | 50% To 60%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	4,205,942	3,740,956
Mortgage Receivable | Greater than 1.4x | 60% To 70%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	2,449,915	1,442,783
Mortgage Receivable | Greater than 1.4x | 70% To 80%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	74,854	198,103
Mortgage Receivable | Greater than 1.4x | 80% To 90%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		57,439
Mortgage Receivable | 1.2x To 1.4x
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	1,044,891	1,046,015
Mortgage Receivable | 1.2x To 1.4x | Less than 50%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	52,805	133,289
Mortgage Receivable | 1.2x To 1.4x | 50% To 60%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	225,433	173,453
Mortgage Receivable | 1.2x To 1.4x | 60% To 70%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	597,222	502,746
Mortgage Receivable | 1.2x To 1.4x | 70% To 80%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	169,431	153,481
Mortgage Receivable | 1.2x To 1.4x | 80% To 90%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		83,046
Mortgage Receivable | 1.0x To 1.2x
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	200,000	154,614
Mortgage Receivable | 1.0x To 1.2x | Less than 50%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	64,700	53,761
Mortgage Receivable | 1.0x To 1.2x | 50% To 60%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	62,516	23,378
Mortgage Receivable | 1.0x To 1.2x | 60% To 70%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	72,784	26,005
Mortgage Receivable | 1.0x To 1.2x | 70% To 80%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		24,086
Mortgage Receivable | 1.0x To 1.2x | 80% To 90%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		27,384
Mortgage Receivable | Less than 1.0x
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	80,801	65,474
Mortgage Receivable | Less than 1.0x | Less than 50%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	66,486
Mortgage Receivable | Less than 1.0x | 50% To 60%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial	$ 14,315	18,930
Mortgage Receivable | Less than 1.0x | 60% To 70%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		43,607
Mortgage Receivable | Less than 1.0x | 80% To 90%
Financing Receivable, Recorded Investment [Line Items]
Mortgage loan, commercial		$ 2,937

Nontrade Receivables and Allowa

Nontrade Receivables and Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Nontrade receivables	$ 11,890,073	$ 10,482,229
Allowance for credit losses	(41,301)	(53,276)	$ (42,925)
Net nontrade receivables	11,848,772	10,428,953
Non Trade Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Nontrade receivables	41,877	32,823
Allowance for credit losses	(4,301)	(4,876)	$ (5,525)
Net nontrade receivables	37,576	27,947
Agents | Non Trade Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Nontrade receivables	14,167	11,860
Allowance for credit losses	(4,301)	(4,876)
Net nontrade receivables	9,866	6,984
Reinsurer | Non Trade Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Nontrade receivables	27,710	20,963
Net nontrade receivables	$ 27,710	$ 20,963

Allowances For Credit Losses An

Allowances For Credit Losses And Investment in Financing Receivables (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables, gross	$ 11,890,073	$ 10,482,229
Allowance for credit losses:
Beginning balance	53,276	42,925
Provision / (benefit)	(11,975)	10,351
Ending balance	41,301	53,276
Financing receivables ending balance net of valuation allowance	11,848,772	10,428,953
Mortgage Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables, gross	11,798,939	10,400,141
Allowance for credit losses:
Beginning balance	48,400	37,400
Provision / (benefit)	(11,400)	11,000
Ending balance	37,000	48,400
Financing receivables ending balance net of valuation allowance	11,761,939	10,351,741
Non Trade Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables, gross	41,877	32,823
Allowance for credit losses:
Beginning balance	4,876	5,525
Provision / (benefit)	(575)	(649)
Ending balance	4,301	4,876
Financing receivables ending balance net of valuation allowance	37,576	27,947
Affiliates
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables, gross	39,120	39,120
Allowance for credit losses:
Financing receivables ending balance net of valuation allowance	39,120	39,120
Non Affiliates
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables, gross	10,137	10,145
Allowance for credit losses:
Financing receivables ending balance net of valuation allowance	$ 10,137	$ 10,145

Financing Receivables - Additio

Financing Receivables - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Provision (benefit) charged to operations	$ (11,975)	$ 10,351
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Provision (benefit) charged to operations	$ (11,400)	$ 11,000

Aging Analysis of Past Due Fina

Aging Analysis of Past Due Financing Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 19,933	$ 16,154
Current	11,870,140	10,466,075
Total	11,890,073	10,482,229
Mortgage Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,798,939	10,400,141
Total	11,798,939	10,400,141
Non Trade Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	19,434	15,964
Current	22,443	16,859
Total	41,877	32,823
Affiliates
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	39,120	39,120
Total	39,120	39,120
Non Affiliates
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	499	190
Current	9,638	9,955
Total	10,137	10,145
Financing Receivables, 31 to 60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,955	7,699
Financing Receivables, 31 to 60 Days Past Due | Non Trade Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,955	7,590
Financing Receivables, 31 to 60 Days Past Due | Non Affiliates
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		109
Financing Receivables, 61 to 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,297	1,672
Financing Receivables, 61 to 90 Days Past Due | Non Trade Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,279	1,662
Financing Receivables, 61 to 90 Days Past Due | Non Affiliates
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	18	10
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,681	6,783
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Trade Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,200	6,712
Financing Receivables, Equal to Greater than 90 Days Past Due | Non Affiliates
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 481	$ 71

Reinsurance - Additional Inform

Reinsurance - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reinsurance [Line Items]
Reinsurance recoverables and receivables, collateral	$ 3,970,978	$ 3,419,252
Minimum
Reinsurance [Line Items]
Reinsurance retained amount per individual	1,000	1,000
Maximum
Reinsurance [Line Items]
Reinsurance retained amount per individual	$ 5,000	$ 5,000

Effect of Reinsurance on Benefi

Effect of Reinsurance on Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effects of Reinsurance [Line Items]
Policyholder Benefits and Claims Incurred, Direct	$ 7,594,483	$ 2,908,967	$ 3,100,199
Policyholder Benefits and Claims Incurred, Ceded	483,498	527,978	499,825
Policyholder Benefits and Claims Incurred, Assumed	18,254	2,189	2,720
Policyholder Benefits and Claims Incurred, Net	7,129,239	2,383,178	2,603,094
Life
Effects of Reinsurance [Line Items]
Policyholder Benefits and Claims Incurred, Direct	425,845	263,594	175,293
Policyholder Benefits and Claims Incurred, Ceded	73,471	67,801	65,118
Policyholder Benefits and Claims Incurred, Assumed	127	650	1,057
Annuities
Effects of Reinsurance [Line Items]
Policyholder Benefits and Claims Incurred, Direct	6,601,650	2,015,225	2,333,922
Policyholder Benefits and Claims Incurred, Ceded	33,230	33,024	39,481
Policyholder Benefits and Claims Incurred, Assumed	1,701	1,520	1,663
Accident and health
Effects of Reinsurance [Line Items]
Policyholder Benefits and Claims Incurred, Direct	566,988	630,148	590,984
Policyholder Benefits and Claims Incurred, Ceded	376,797	427,153	$ 395,226
Policyholder Benefits and Claims Incurred, Assumed	$ 16,426	$ 19

Reinsurance and Investment Cont

Reinsurance and Investment Contract Recoverables (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Reinsurance Retention Policy [Line Items]
Total reinsurance and investment contract recoverables	$ 5,295,486	$ 4,687,918
Life
Reinsurance Retention Policy [Line Items]
Total reinsurance and investment contract recoverables	986,636	1,031,953
Annuities
Reinsurance Retention Policy [Line Items]
Total reinsurance and investment contract recoverables	1,275,293	890,709
Accident and health
Reinsurance Retention Policy [Line Items]
Total reinsurance and investment contract recoverables	$ 3,033,557	$ 2,765,256

Deferred Acquisition Costs (Det

Deferred Acquisition Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Policy Acquisition Costs [Line Items]
Balance, beginning of year	$ 5,246,343	$ 6,283,236	$ 4,362,771
Capitalization	730,825	1,006,773	911,425
Interest	239,127	172,195	181,239
Amortization	(1,244,315)	(1,438,375)	(1,331,923)
Change in shadow DAC	(1,121,140)	(777,486)	2,159,724
Balance, end of year	$ 3,850,840	$ 5,246,343	$ 6,283,236

Pretax Impact on Assets and Lia

Pretax Impact on Assets and Liabilities as Result of Unlocking (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liabilities:
Net increase	$ 117,738	$ 119,643	$ 65,527
Unlocking Of Assumptions
Assets:
Total assets (decrease) increase	(220,185)	(295,103)	(136,906)
Liabilities:
Total liabilities increase (decrease)	(337,923)	(414,746)	(202,433)
Unlocking Of Assumptions | Account balances and future policy benefit reserves
Liabilities:
Total liabilities increase (decrease)	(330,853)	(412,959)	(154,064)
Unlocking Of Assumptions | Unearned Premiums
Liabilities:
Total liabilities increase (decrease)	(7,070)	(1,787)	(48,369)
Unlocking Of Assumptions | DAC
Assets:
Total assets (decrease) increase	(177,274)	(246,669)	(109,797)
Unlocking Of Assumptions | DSI
Assets:
Total assets (decrease) increase	(35,266)	(51,156)	(32,400)
Unlocking Of Assumptions | VOBA
Assets:
Total assets (decrease) increase		(212)	(180)
Unlocking Of Assumptions | Reinsurance Recoverable
Assets:
Total assets (decrease) increase	$ (7,645)	$ 2,934	$ 5,471

Schedule of Deferred Sales Indu

Schedule of Deferred Sales Inducement Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Deferred Sales Inducements [Roll Forward]
Balance, beginning of year	$ 764,554	$ 1,110,192	$ 847,000
Capitalization	14,726	29,176	48,546
Amortization	(207,629)	(277,616)	(284,883)
Interest	23,107	28,569	33,927
Change in shadow DSI	(163,440)	(125,767)	465,602
Balance, end of year	$ 431,318	$ 764,554	$ 1,110,192

Income Tax (Benefit) Expense (D

Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax expense (benefit) attributable to operations:
Current tax expense (benefit)	$ 83,114	$ 558,016	$ 551,052
Deferred tax expense (benefit)	125,443	(202,860)	(307,986)
Total income tax expense	208,557	355,156	243,066
Income tax effect on AOCI:
Attributable to unrealized gains (losses) on investments	437,719	357,363	(691,519)
Attributable to unrealized gains (losses) on postretirement obligations	(2)	36
Attributable to unrealized gains (losses) on foreign exchange	461	373	(2,159)
Total income tax effect on equity	$ 646,735	$ 712,928	$ (450,612)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Statutory income tax rate	21.00%	35.00%
Income taxes (received)/ paid		$ 267,668	$ 914,413	$ 329,563
Tax payable		100	18
Unrecognized tax benefits and related accrued interest		2,326	1,805
AZOA
Income Tax Disclosure [Line Items]
Tax payable		$ (309,694)	$ (89,111)

Reconciliation of Income Tax Ex

Reconciliation of Income Tax Expense (Benefit) Computed at Statutory Rate (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit [Line Items]
Income tax expense computed at the statutory rate		$ 322,882	$ 400,167	$ 295,177
Dividends-received deductions and tax-exempt interest		(38,369)	(40,326)	(40,687)
State income tax		(2,074)	11,266	4,642
Accrual (release) of LIH tax credits and benefits	[1]	11,691	(5,819)	(1,284)
Accrual (release) of tax contingency reserve		522	373	(10,701)
Foreign tax, net		(3,410)	(3,587)	(3,143)
COLI		(14,301)	(7,833)	(2,285)
Penalties		232	(47)	529
Deferred tax revaluation due to tax rate change	[2]	(70,281)
Other		1,665	962	818
Total income tax expense		$ 208,557	$ 355,156	$ 243,066
[1]	The Company recognized impairments on LIH investments of $18,351 during 2017 due to the tax rate change enacted in the United States.
[2]	On December 22, 2017, the United States passed the Tax Act of 2017 which reduced the corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017. As a result, the deferred taxes recorded on the Consolidated Balance Sheets were revalued to reflect the reduction in the future corporate tax rate.

Reconciliation of Income Tax101

Reconciliation of Income Tax Expense (Benefit) Computed at Statutory Rate (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Components Of Income Tax Expense Benefit [Line Items]
Impairment on LIH investments		$ 18,351
Statutory income tax rate	21.00%	35.00%
Scenario, Forecast [Member]
Components Of Income Tax Expense Benefit [Line Items]
Statutory income tax rate	21.00%

Significant Components of Net D

Significant Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Policy reserves	$ 2,793,209	$ 3,326,409
Expense accruals	5,569	40,792
Other-than-temporarily impaired assets	11,352	40,821
Provision for postretirement benefits	32,490	49,437
Other	1,148	3,267
Total deferred tax assets	2,843,768	3,460,726
Deferred tax liabilities:
Policy reserves	(795,733)
Deferred acquisition costs	(589,011)	(1,533,188)
Investment income	(303,537)	(253,987)
Depreciation and amortization	(36,005)	(59,822)
Net unrealized gains on investments and foreign exchange	(1,295,898)	(1,225,720)
Total deferred tax liabilities	(3,020,184)	(3,072,717)
Net deferred tax asset	0	388,009
Net deferred tax asset liabilities	$ (176,416)	$ 0

Reconciliation of Unrecognized

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Beginning balance	$ 1,697	$ 1,367
Additions based on tax positions related to the current year	845	330
Amounts released related to tax positions taken in prior years	(386)
Ending balance	$ 2,156	$ 1,697

Schedule of Goodwill (Detail)

Schedule of Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Balance, beginning of year		$ 487,834	$ 482,905
Increase in goodwill due to acquisition	[1]	0	4,929
Balance, end of year		$ 487,834	$ 487,834
[1]	The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition.

Intangible Assets (Detail)

Intangible Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Balance, beginning of year		$ 2,496	$ 0
Increase in intangibles due to acquisition	[1]	0	2,872
Amortization		(410)	(376)
Balance, end of year		$ 2,086	$ 2,496
[1]	The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition.

Schedule of Finite-Lived Intang

Schedule of Finite-Lived Intangible Assets Future Amortization Expense (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Net amortization of intangible assets
2,018	$ 410
2,019	410
2,020	410
2,021	410
2,022	410
2023 and beyond	36
Total	$ 2,086

Goodwill and Intangible Asse107

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Accumulated amortization of intangible assets	$ 15,279	$ 14,869

Value of Business Acquired and

Value of Business Acquired and Changes in the Balances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Balance, beginning of year	$ 0	$ 0	$ 0
Interest	64	127	210
Amortization	(1,857)	(1,619)	(2,950)
Change in shadow VOBA	1,793	1,492	2,740
Balance, end of year	$ 0	$ 0	$ 0

Net Amortization Of VOBA (Detai

Net Amortization Of VOBA (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Schedule Of Estimated Future Amortization Expense [Line Items]
2,018	$ 1,923
2,019	785
2020 and beyond	0
Total	$ 2,708

Value of Business Acquired - Ad

Value of Business Acquired - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Accumulated amortization of VOBA and other intangible assets	$ 244,692	$ 242,835

Separate Accounts and Annuit111

Separate Accounts and Annuity Product Guarantees - Additional Information (Detail) - Investment	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Guaranteed Minimum Death Benefit and Guaranteed Minimum Income Benefit
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Stochastically generated investment performance scenarios	100	100
Mean investment performance assumption	6.50%	6.50%
Volatility assumption	13.40%	13.40%
Lapse rates, spike rates	60.00%	40.00%
Lapse rates, ultimate rate	15.00%	15.00%
Guaranteed Minimum Accumulation And Withdrawal Benefit
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Stochastically generated investment performance scenarios	1,000	1,000
Lapse rates, spike rates	60.00%	40.00%
Lapse rates, ultimate rate	15.00%	15.00%
Volatility assumption period	1 year	1 year

Market Volatility Assumption Va

Market Volatility Assumption Varies by Fund Type and Grades from a Current Volatility to Long-Term Assumption (Detail) - Guaranteed Minimum Accumulation And Withdrawal Benefit	Dec. 31, 2017	Dec. 31, 2016
Large Cap
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	13.40%	16.30%
Large Cap | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	18.00%	18.10%
Bonds
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	3.40%	3.40%
Bonds | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	3.90%	3.90%
International
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	13.70%	16.80%
International | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	21.20%	21.40%
Small Cap
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	17.40%	20.30%
Small Cap | Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Volatility assumption	21.50%	21.50%

Guaranteed Minimums (Detail)

Guaranteed Minimums (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Guaranteed Minimum Death Benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 34,567,835	$ 31,929,223
Net amount at risk	446,112	723,781
Guaranteed Minimum Death Benefit | Return of premium
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	26,092,333	23,400,820
Net amount at risk	$ 25,909	$ 73,163
Weighted age (years)	64 years	64 years
Guaranteed Minimum Death Benefit | Ratchet and return of premium
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 4,555,502	$ 4,602,792
Net amount at risk	$ 26,368	$ 142,357
Weighted age (years)	68 years	68 years
Guaranteed Minimum Death Benefit | Ratchet and rollup
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 3,598,920	$ 3,602,988
Net amount at risk	$ 365,871	$ 484,301
Weighted age (years)	72 years	71 years
Guaranteed Minimum Death Benefit | Ratchet and earnings protection rider
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 2,902	$ 3,072
Net amount at risk	$ 624	$ 885
Weighted age (years)	86 years	84 years
Guaranteed Minimum Death Benefit | Reset
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 81,771	$ 84,191
Net amount at risk	$ 475	$ 692
Weighted age (years)	77 years	76 years
Guaranteed Minimum Death Benefit | Earnings protection rider
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 236,407	$ 235,360
Net amount at risk	$ 26,865	$ 22,383
Weighted age (years)	70 years	69 years
Guaranteed Minimum Income Benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 6,420,403	$ 6,630,874
Net amount at risk	454,426	728,744
Guaranteed Minimum Income Benefit | Return of premium
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	88,576	92,121
Net amount at risk	$ 265	$ 325
Weighted age (years)	74 years	73 years
Guaranteed Minimum Income Benefit | Ratchet and return of premium
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 1,728,722	$ 1,885,185
Net amount at risk	$ 446	$ 4,526
Weighted age (years)	71 years	70 years
Guaranteed Minimum Income Benefit | Ratchet and rollup
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 4,603,105	$ 4,653,568
Net amount at risk	$ 453,715	$ 723,893
Weighted age (years)	68 years	68 years
Guaranteed Minimum Accumulation Benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 6,506,679	$ 6,938,088
Net amount at risk	13,887	89,008
Guaranteed Minimum Accumulation Benefit | Five years
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	2,489,002	2,738,307
Net amount at risk	$ 1,185	$ 10,160
Weighted age (years)	71 years	70 years
Guaranteed Minimum Accumulation Benefit | Ten years
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 2,994	$ 3,212
Net amount at risk	$ 1	$ 1
Weighted age (years)	84 years	82 years
Guaranteed Minimum Accumulation Benefit | Target date retirement - 7 year
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 578,324	$ 613,746
Net amount at risk	$ 447	$ 1,218
Weighted age (years)	65 years	64 years
Guaranteed Minimum Accumulation Benefit | Target date retirement - 10 year
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 235,167	$ 250,033
Net amount at risk	$ 534	$ 4,559
Weighted age (years)	62 years	61 years
Guaranteed Minimum Accumulation Benefit | Target date with management levers
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 3,201,192	$ 3,332,790
Net amount at risk	$ 11,720	$ 73,070
Weighted age (years)	63 years	62 years
Guaranteed Minimum Withdrawal Benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 16,491,906	$ 15,818,164
Net amount at risk	2,486,436	3,027,521
Guaranteed Minimum Withdrawal Benefit | No living benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 762,569	$ 707,212
Weighted age (years)	69 years	69 years
Guaranteed Minimum Withdrawal Benefit | Life benefit with optional reset
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 927,637	$ 921,876
Net amount at risk	$ 145,062	$ 171,135
Weighted age (years)	69 years	69 years
Guaranteed Minimum Withdrawal Benefit | Life benefit with automatic reset
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 1,521,855	$ 1,471,419
Net amount at risk	$ 133,182	$ 194,438
Weighted age (years)	66 years	65 years
Guaranteed Minimum Withdrawal Benefit | Life benefit with 8% rollup
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 27,283	$ 28,562
Net amount at risk	$ 4,380	$ 6,286
Weighted age (years)	72 years	70 years
Guaranteed Minimum Withdrawal Benefit | Life benefit with 10% rollup
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 1,141,470	$ 1,109,985
Net amount at risk	$ 291,570	$ 348,423
Weighted age (years)	65 years	65 years
Guaranteed Minimum Withdrawal Benefit | Life benefit with management levers
Net Amount at Risk by Product and Guarantee [Line Items]
Account value	$ 12,111,092	$ 11,579,110
Net amount at risk	$ 1,912,242	$ 2,307,239
Weighted age (years)	62 years	61 years

Account Balances of Variable An

Account Balances of Variable Annuity Which are Invested in Separate Account (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	$ 28,192,877	$ 27,733,261
Mutual Funds | Bond Funds
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	3,303,084	3,484,805
Mutual Funds | Domestic Equity Funds
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	14,506,783	13,959,524
Mutual Funds | International Equity Funds
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	1,387,275	1,308,840
Mutual Funds | Specialty
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	8,484,888	8,320,880
Money Market Funds
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	439,587	585,039
Other Funds
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account investment	$ 71,260	$ 74,173

Summary of Liabilities for Vari

Summary of Liabilities for Variable Contract Guarantees (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Beginning balance	$ 2,634,104	$ 2,818,888
Incurred guaranteed benefits	(242,481)	(118,277)
Paid guaranteed benefits	(23,282)	(66,507)
Ending balance	2,368,341	2,634,104
Guaranteed Minimum Death Benefit
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Beginning balance	89,274	97,027
Incurred guaranteed benefits	5,492	9,845
Paid guaranteed benefits	(12,789)	(17,598)
Ending balance	81,977	89,274
Guaranteed Minimum Income Benefit
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Beginning balance	145,233	176,465
Incurred guaranteed benefits	(35,136)	(17,290)
Paid guaranteed benefits	(9,999)	(13,942)
Ending balance	100,098	145,233
Guaranteed Minimum Accumulation Benefit
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Beginning balance	243,363	374,857
Incurred guaranteed benefits	(61,660)	(96,596)
Paid guaranteed benefits	(355)	(34,898)
Ending balance	181,348	243,363
Guaranteed Minimum Withdrawal Benefit
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Beginning balance	2,156,234	2,170,539
Incurred guaranteed benefits	(151,177)	(14,236)
Paid guaranteed benefits	(139)	(69)
Ending balance	$ 2,004,918	$ 2,156,234

Activity in Accident and Health

Activity in Accident and Health Claim Reserves (Detail) - Accident and health - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Balance at January 1, net of reinsurance and investment contract recoverables of $396,850, $340,048, and $283,252, respectively	$ 196,603	$ 157,321	$ 135,168
Adjustment primarily related to commutation and assumption reinsurance on blocks of business	242	34	323
Current year	105,873	93,844	71,378
Prior years	(5,496)	789	(4,275)
Total incurred	100,377	94,633	67,103
Current year	6,451	5,829	4,331
Prior years	61,917	49,556	40,942
Total paid	68,368	55,385	45,273
Balance at December 31, net of reinsurance and investment contract recoverables of $447,140, $396,850, and $340,048, respectively	$ 228,854	$ 196,603	$ 157,321

Activity in Accident and Hea117

Activity in Accident and Health Claim Reserves (Parenthetical) (Detail) - Accident and health - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Reinsurance recoverable period adjustment	$ 396,850	$ 340,048	$ 283,252
Reinsurance recoverable period adjustment	$ 447,140	$ 396,850	$ 340,048

Mortgage Notes Payable - Additi

Mortgage Notes Payable - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2005	Dec. 31, 2004
Notes Payable [Line Items]
Mortgage Loans					$ 80,000
Construction loan				$ 65,000
Mortgage and construction notes payable	$ 68,628	$ 76,916
Debt instrument, interest rate	5.52%
Debt instrument, maturity date	Aug. 1, 2024
Debt instrument, term	20 years
Interest expense for loans	$ 4,002	$ 4,449	$ 4,871

Future Principal Payments Requi

Future Principal Payments Required Under Northwestern Loan (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Scheduled Principal Payments For Borrowings [Line Items]
2,018	$ 8,758
2,019	9,254
2,020	9,778
2,021	10,332
2,022	10,918
2023 and beyond	19,588
Total	$ 68,628

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Claim	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Commitments and Contingencies [Line Items]
Number of putative and certified class action proceedings | Claim	3
Open capital commitments	$ 132,954	$ 153,887
Unfunded commitment liability	123,110	144,180
Operating lease expenses	4,083	3,729	$ 3,155
Total expense under the agreement	$ 1,084,430	1,333,439	1,167,109
Service Agreements
Commitments and Contingencies [Line Items]
Service fee	0.10%
Additional service fee	0.15%
Agreement termination notice period	90 days
Termination period on which service fee continues to be paid	10 years
Total commitment in the event of termination	$ 59,654
Total expense under the agreement	5,736	$ 6,641	$ 6,677
Service Agreements | Yearly
Commitments and Contingencies [Line Items]
Total commitment in the event of termination	$ 5,965

Commitments and Contingencie121

Commitments and Contingencies - Investments Requiring Commitment of Capital (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Investments		$ 113,183,598	$ 100,199,823
Capital Commitments
Other Commitments [Line Items]
Investments		1,162,371	1,050,195
Capital Commitments | Limited Partnerships
Other Commitments [Line Items]
Investments	[1]	320,123	187,484
Capital Commitments | Private placement debt
Other Commitments [Line Items]
Investments		383,675	448,351
Capital Commitments | Mortgage Loans
Other Commitments [Line Items]
Investments		$ 458,573	$ 414,360
[1]	Included within this caption are limited partnership investments managed by affiliates of the Company. See note 19 for additional details regarding these investments.

Future Minimum Lease Payments R

Future Minimum Lease Payments Required under Operating Leases (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Operating Leased Assets [Line Items]
2,018	$ 2,027
2,019	1,737
2,020	1,310
2,021	777
2,022	479
2023 and beyond	448
Total	$ 6,778

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Matching percentage of eligible employee pre tax contributions	80.00%
Defined contribution plan, employer matching contribution, percent of match	7.50%
Defined contribution plan, employers matching contribution, vesting percentage after three years of service	100.00%
Defined contribution plan, employers matching contribution, service period	3 years
Defined contribution plan employers matching contribution	$ 16,317	$ 15,044	$ 14,204
Severance expense	2,839	983	1,079
Other Liabilities, life insurance benefit	1,164	1,105
Assets held by trust	0	0
Employee Stock
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other liabilities, deferred compensation	$ 1,020	946	754
Aggregate amount of ordinary shares reserved for plan	250,000
Restricted Stock And Stock Appreciation Rights
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Stock-based compensation	$ 9,223	3,983	$ 9,820
Other liabilities, deferred compensation	18,243	13,983
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other liabilities, deferred compensation	33,682	26,358
Nonqualified Deferred Compensation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other liabilities, deferred compensation	$ 92,314	$ 64,738

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) - USD ($)		Jun. 30, 2017	Jan. 09, 2017	Feb. 02, 2016	Jul. 31, 2017	Jul. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Dec. 22, 2010
Related Party Transaction [Line Items]
Related party transaction, loan balance							$ 39,120,000	$ 39,120,000
Interest earned							625,000	384,000	$ 516,000
Accrued interest							1,096,862,000	1,095,038,000
Realized investment (losses) gains, net							83,622,000	(49,325,000)	94,413,000
Other invested assets, fair value							302,216,000	426,137,000
Income recognized							266,602,000	274,562,000	293,333,000
Fees receivable							410,296,000	566,088,000
General and administrative expenses							727,714,000	695,949,000	637,328,000
Dividends							780,000,000	894,165,000	572,125,000
Dividends paid in cash							780,000,000	861,000,000	572,125,000
Dividends in related to loan and accrued interest							0	33,165,000	0
Goodwill							487,834,000	487,834,000	482,905,000
Intangible assets acquired	[1]						0	2,872,000
Amortization expense							410,000	376,000
Other liabilities							4,032,502,000	3,673,122,000
Ceded premiums payable							126,424,000	132,983,000	125,286,000
Reinsurance recoverables & receivables							1,248,634,000	$ 933,074,000
Lending capacity under the agreement, percentage								5.00%
Amounts borrowed under the line of credit agreement							0	$ 0
Other affiliated entities
Related Party Transaction [Line Items]
Reinsurance recoverables & receivables							423,000	79,000
Field Marketing Office
Related Party Transaction [Line Items]
Business combination, interest acquired				100.00%
Purchase price of business				$ 7,710,000
Goodwill				4,929,000
Intangible assets acquired				$ 2,872,000
Intangible assets amortization period				7 years
Amortization expense							410,000	376,000
AZOA
Related Party Transaction [Line Items]
Related party transaction, amount of loan agreement								$ 39,120,000
Annual interest rate on loan								1.61%
Interest earned							630,000	$ 214,000
Related party loan, remaining balance							39,120,000	39,120,000
Accrued interest							214,000	214,000
Dividends							780,000,000	894,165,000	572,125,000
Dividends paid in cash							$ 780,000,000	861,000,000	572,125,000
Dividends in related to loan and accrued interest								33,165,000
AZLPF Investments [Member] | Preferred Stock
Related Party Transaction [Line Items]
Other liabilities								32,195,000
Redemption of Preferred stock liability and related accrued interest			$ 32,244,000
Allianz Life and Annuity Company [Member]
Related Party Transaction [Line Items]
Realized investment (losses) gains, net		$ 1,440,000
Allianz Managed Operations And Services of America (AMOSA)
Related Party Transaction [Line Items]
Related party transaction, amount of loan agreement									33,000,000
Related party transaction, loan balance									33,000,000	$ 33,000,000
Accrued interest										$ 165,000
Annual interest rate on loan							2.03%
Interest earned									488,000
PIMCO
Related Party Transaction [Line Items]
Related party transaction, investments							$ 70,000,000	50,114,000
Unfunded investment							57,000,000	44,000,000
Realized investment (losses) gains, net								413,000
Other invested assets, fair value							14,649,000	6,365,000
Allianz Global Investors Capital Llc
Related Party Transaction [Line Items]
Related party transaction, investments							35,000,000
Unfunded investment							32,788,000
Realized investment (losses) gains, net							0
Other invested assets, fair value							2,084,000
Affiliates | Office Space Leases
Related Party Transaction [Line Items]
Rental income							990,000	909,000	1,065,000
Rent expense							28,000	27,000	27,000
Receivable balance of rental income							282,000	152,000
Affiliated Companies
Related Party Transaction [Line Items]
Service fee							104,074,000	100,689,000	63,530,000
Accrued service fee							30,462,000	40,267,000
Revenue earned							27,183,000	21,568,000	6,305,000
Receivables for expenses							8,153,000	8,260,000
Related Party Transactions
Related Party Transaction [Line Items]
Income recognized							11,986,000	12,771,000	14,102,000
Fees receivable							979,000	2,022,000
General and administrative expenses							$ 0	$ 441,000	732,000
Business combination, interest acquired						100.00%
Business combination, consideration						$ 2,617,000
Related party, dividend						$ 2,125,000
Quota share reinsurance ceded, percentage							100.00%				20.00%
Related party, derivative gain									3,806,000
Related party, dividend received									$ 455,843,000
Concentration risk					60.00%
Ceded premiums payable					$ 429,756,000
Reinsurance recoverables, including reinsurance premium paid							$ 436,298,000
Reinsurance Payable							$ 396,562,000
[1]	The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition.

Statutory Financial Data and125

Statutory Financial Data and Dividend Restrictions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 6,011,236	$ 6,165,279
Statutory net gain (loss) from operations	$ (2,849,638)	$ 1,497,192
Statutory restrictions on dividend	In accordance with Minnesota Statutes, the Company may declare and pay from its Unassigned surplus cash dividends of not more than the greater of 10% of its prior year-end statutory surplus, or the net gain from operations of the insurer, not including realized gains, for the 12-month period ending the 31st day of the next preceding year.
Ordinary dividend which can be paid without approval	$ 601,124

Capital Stock (Detail)

Capital Stock (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Capital Unit [Line Items]
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	20,000,001	20,000,001
Common stock, shares outstanding	20,000,001	20,000,001
Common stock par value, per share	$ 1	$ 1
Preferred Class A
Capital Unit [Line Items]
Preferred stock, shares authorized	200,000,000
Preferred stock, shares issued	18,903,484
Preferred stock, shares outstanding	18,903,484
Preferred stock, redemption rights description	Designated by Board for each series issued
Preferred stock par value, per share	$ 1
Voluntary or involuntary liquidation rights	Designated by Board for each series issued
Class A, Series A preferred stock
Capital Unit [Line Items]
Preferred stock, shares authorized	8,909,195	8,909,195
Preferred stock, shares issued	8,909,195	8,909,195
Preferred stock, shares outstanding	8,909,195	8,909,195
Preferred stock, redemption rights description	$35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid
Preferred stock par value, per share	$ 1	$ 1
Preferred stock, redemption price per share	$ 35.02
Percentage of redemption right	6.00%
Voluntary or involuntary liquidation rights	$35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid
Voluntary or involuntary liquidation rights per share	$ 35.02
Percentage of Voluntary or involuntary liquidation rights	6.00%
Class A, Series B preferred stock
Capital Unit [Line Items]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	9,994,289	9,994,289
Preferred stock, shares outstanding	9,994,289	9,994,289
Preferred stock, redemption rights description	$35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid
Preferred stock par value, per share	$ 1	$ 1
Preferred stock, redemption price per share	$ 35.02
Percentage of redemption right	6.00%
Voluntary or involuntary liquidation rights	$35.02 per share plus an amount to yield a compounded annual return of 6%, after actual dividends paid
Voluntary or involuntary liquidation rights per share	$ 35.02
Percentage of Voluntary or involuntary liquidation rights	6.00%
Preferred Class B
Capital Unit [Line Items]
Preferred stock, shares authorized	400,000,000
Preferred stock, shares issued	400,000,000
Preferred stock, shares outstanding	400,000,000
Preferred stock, redemption rights description	Designated by Board for each series issued
Preferred stock par value, per share	$ 1
Voluntary or involuntary liquidation rights	Designated by Board for each series issued

Capital Structure - Additional

Capital Structure - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Capital Unit [Line Items]
Voting rights	One vote per share
Preferred Class A
Capital Unit [Line Items]
Voting rights	One vote per share
Conversion basis of preferred stock to common stock	Each share of Class A preferred stock is convertible into one share of the Company's common stock
Preferred Class B
Capital Unit [Line Items]
Voting rights	No voting rights

Components of Accumulated Other

Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ 7,074,667	$ 6,516,326		$ 7,776,350
Amounts reclassified from AOCI		(52,390)	18,857		(32,725)
Total other comprehensive income (loss)		951,076	664,328		(1,288,195)
Ending balance		7,959,706	7,074,667		6,516,326
Net unrealized gain (loss) on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		1,165,665	472,376		1,765,606
OCI before reclassifications		1,001,398	667,048		(1,263,867)
Amounts reclassified from AOCI		(43,085)	26,241		(29,363)
Total other comprehensive income (loss)		958,313	693,289		(1,293,230)
Ending balance		2,123,978	1,165,665		472,376
Net gain (loss) on cash flow hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[1],[2]	(19,206)	10,408		1,475
OCI before reclassifications	[1]	1,223	(22,227)	[2]	12,311	[2]
Amounts reclassified from AOCI	[1]	(9,313)	(7,387)	[2]	(3,378)	[2]
Total other comprehensive income (loss)	[1]	(8,090)	(29,614)	[2]	8,933	[2]
Ending balance	[1]	(27,296)	(19,206)	[2]	10,408	[2]
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		6,923	6,231		10,240
OCI before reclassifications		857	692		(4,009)
Total other comprehensive income (loss)		857	692		(4,009)
Ending balance		7,780	6,923		6,231
Pension and postretirement plan adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(104)	(65)		(176)
OCI before reclassifications		(12)	(42)		95
Amounts reclassified from AOCI		8	3		16
Total other comprehensive income (loss)		(4)	(39)		111
Ending balance		(108)	(104)		(65)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		1,153,278	488,950		1,777,145
OCI before reclassifications		1,003,466	645,471		(1,255,470)
Amounts reclassified from AOCI		(52,390)	18,857		(32,725)
Total other comprehensive income (loss)		951,076	664,328		(1,288,195)
Ending balance		$ 2,104,354	$ 1,153,278		$ 488,950
[1]	Includes cumulative foreign currency translation losses on the hedged items of $18,704, $79,727, and $27,168 at December 31, 2017, 2016, and 2015, respectively.
[2]	The previously issued 2016 Consolidated Financial Statements improperly disclosed OCI before reclassifications as $(29,614) and $8,933 for the years ended December 31, 2016 and 2015, respectively. OCI before reclassifications previously included amounts that were reclassified from AOCI of $(7,387) and $(3,378) for the years ended December 31, 2016 and 2015, respectively. The December 31, 2016 and 2015 amounts have been corrected to conform with current year presentation.

Components of Accumulated Ot129

Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative foreign currency translation losses on hedged items	$ (18,704)	$ (79,727)	$ (27,168)
As Originally Reported
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications		$ (29,614)	$ 8,933

Reclassifications From Accumula

Reclassifications From Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Available-for-sale-securities		$ (132,196)	$ (125,498)		$ (153,388)
Income tax expense (benefit)		(208,557)	(355,156)		(243,066)
Total amounts reclassified from AOCI		(713,963)	(788,178)		(600,296)
Amount Reclassified from AOCI, pension and other postretirement plan adjustments, net		52,390	(18,857)		32,725
Net unrealized gain (loss) on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified from AOCI, pension and other postretirement plan adjustments, net		43,085	(26,241)		29,363
Net gain (loss) on cash flow hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified from AOCI, pension and other postretirement plan adjustments, net	[1]	9,313	7,387	[2]	3,378	[2]
Pension and postretirement plan adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified from AOCI, pension and other postretirement plan adjustments, net		(8)	(3)		(16)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gain (loss) on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Available-for-sale-securities		66,284	(40,370)		45,174
Income tax expense (benefit)		23,199	(14,129)		15,811
Total amounts reclassified from AOCI		43,085	(26,241)		29,363
Reclassification out of Accumulated Other Comprehensive Income | Net gain (loss) on cash flow hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Effective portion of gains		13,622	11,121		5,197
Ineffective portion of gains		706	243
Income tax expense (benefit)		5,015	3,977		1,819
Total amounts reclassified from AOCI		9,313	7,387		3,378
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement plan adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified from AOCI, pension and other postretirement plan adjustments		(12)	(5)		(25)
Amount Reclassified from AOCI, Amortization of actuarial gains (losses)		(4)	(2)		(9)
Amount Reclassified from AOCI, pension and other postretirement plan adjustments, net		$ (8)	$ (3)		$ (16)
[1]	Includes cumulative foreign currency translation losses on the hedged items of $18,704, $79,727, and $27,168 at December 31, 2017, 2016, and 2015, respectively.
[2]	The previously issued 2016 Consolidated Financial Statements improperly disclosed OCI before reclassifications as $(29,614) and $8,933 for the years ended December 31, 2016 and 2015, respectively. OCI before reclassifications previously included amounts that were reclassified from AOCI of $(7,387) and $(3,378) for the years ended December 31, 2016 and 2015, respectively. The December 31, 2016 and 2015 amounts have been corrected to conform with current year presentation.

Analysis of Foreign Currency Tr

Analysis of Foreign Currency Translation, Net of Tax (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Cumulative Translation Adjustment Summary [Roll Forward]
Beginning amount of cumulative translation adjustments	$ 6,923	$ 6,231	$ 10,240
Aggregate adjustment for the period resulting from translation adjustments	1,318	1,065	(6,168)
Amount of income tax expense for the period related to aggregate adjustment	(461)	(373)	2,159
Net aggregate translation included in equity	857	692	(4,009)
Ending amount of cumulative translation adjustments	$ 7,780	$ 6,923	$ 6,231
Canadian dollar to United States dollar foreign exchange rate at end of year	0.79812	0.74568	0.71989

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Subsidiary
Number of Wholly owned subsidiaries owned by Questar segment	2

Unconsolidated Segment Results

Unconsolidated Segment Results (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Premiums and policy fees, net	$ 1,605,227	$ 1,407,279	$ 1,449,591
Interest and similar income, net	4,522,219	4,325,737	4,175,469
Change in fair value of assets and liabilities	3,602,468	(178,238)	(532,720)
Realized investment gains (losses), net	83,622	(49,325)	94,413
Fee, commission, and other revenue	324,730	309,854	303,399
Total revenue	10,138,266	5,815,307	5,490,152
Benefits and expenses:
Net benefits and expenses	7,129,239	2,383,178	2,603,094
General and administrative and commission	1,812,144	2,029,388	1,804,437
Change in deferred acquisition costs, net	274,363	259,407	239,259
Total benefits and expenses	9,215,746	4,671,973	4,646,790
Pretax income (loss)	922,520	1,143,334	843,362
Operating Segments | Annuities
Revenue:
Premiums and policy fees, net	1,249,793	1,117,580	1,133,285
Interest and similar income, net	4,301,602	4,133,359	3,999,693
Change in fair value of assets and liabilities	3,368,121	(218,922)	(492,479)
Realized investment gains (losses), net	80,111	(49,126)	90,948
Fee, commission, and other revenue	249,280	243,789	236,454
Total revenue	9,248,907	5,226,680	4,967,901
Benefits and expenses:
Net benefits and expenses	6,570,915	1,982,879	2,296,057
General and administrative and commission	1,486,314	1,774,740	1,549,692
Change in deferred acquisition costs, net	313,504	315,760	279,582
Total benefits and expenses	8,370,733	4,073,379	4,125,331
Pretax income (loss)	878,174	1,153,301	842,570
Operating Segments | Life
Revenue:
Premiums and policy fees, net	204,920	147,013	172,660
Interest and similar income, net	135,346	113,465	103,326
Change in fair value of assets and liabilities	233,840	40,600	(38,553)
Realized investment gains (losses), net	2,272	623	1,597
Fee, commission, and other revenue	1,485	747	186
Total revenue	577,863	302,448	239,216
Benefits and expenses:
Net benefits and expenses	350,354	194,667	114,377
General and administrative and commission	219,519	159,455	165,386
Change in deferred acquisition costs, net	(59,168)	(69,477)	(53,642)
Total benefits and expenses	510,705	284,645	226,121
Pretax income (loss)	67,158	17,803	13,095
Operating Segments | Questar
Revenue:
Interest and similar income, net	68	32	3
Change in fair value of assets and liabilities	2	2
Realized investment gains (losses), net	3
Fee, commission, and other revenue	110,989	101,432	105,830
Total revenue	111,062	101,466	105,833
Benefits and expenses:
General and administrative and commission	122,989	114,009	110,624
Total benefits and expenses	122,989	114,009	110,624
Pretax income (loss)	(11,927)	(12,543)	(4,791)
Operating Segments | Legacy
Revenue:
Premiums and policy fees, net	150,514	142,686	143,646
Interest and similar income, net	85,203	78,881	72,447
Change in fair value of assets and liabilities	505	82	(1,688)
Realized investment gains (losses), net	1,236	(822)	1,868
Fee, commission, and other revenue	1,380	1,191	253
Total revenue	238,838	222,018	216,526
Benefits and expenses:
Net benefits and expenses	207,970	205,632	192,660
General and administrative and commission	21,726	18,489	18,059
Change in deferred acquisition costs, net	20,027	13,124	13,319
Total benefits and expenses	249,723	237,245	224,038
Pretax income (loss)	(10,885)	(15,227)	(7,512)
Eliminations
Revenue:
Fee, commission, and other revenue	(38,404)	(37,305)	(39,324)
Total revenue	(38,404)	(37,305)	(39,324)
Benefits and expenses:
General and administrative and commission	(38,404)	(37,305)	(39,324)
Total benefits and expenses	$ (38,404)	$ (37,305)	$ (39,324)

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Allianz Individual Insurance Group LLC (AIIG) - Subsequent Event $ in Thousands	Jan. 22, 2018USD ($)
Tru Choice
Subsequent Event [Line Items]
Initial cash contribution	$ 1,716
Membership interests	100.00%
FMOs AFM, GamePlan, TAS, and Ann Arbor Annuity Exchange, LLC
Subsequent Event [Line Items]
Membership interests held in other subsidiaries contributed in exchange for membership interest of TruChoice	100.00%

Schedule I Investments Other Th

Schedule I Investments Other Than Investments in Related Parties (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	$ 106,957,245	[1]
Fair Value	113,794,434
Amount at which shown in the consolidated balance sheets	113,183,598
Fixed-maturity securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	92,651,143	[1]
Fair Value	98,841,507
Amount at which shown in the consolidated balance sheets	98,841,507
Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	92,615,161	[1]
Fair Value	98,805,288
Amount at which shown in the consolidated balance sheets	98,805,288
Fixed-maturity securities | Trading Securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	35,982	[1]
Fair Value	36,219
Amount at which shown in the consolidated balance sheets	36,219
U.S. Government | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	2,449,361	[1]
Fair Value	2,441,454
Amount at which shown in the consolidated balance sheets	2,441,454
U.S. Government | Fixed-maturity securities | Trading Securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	30,578	[1]
Fair Value	30,901
Amount at which shown in the consolidated balance sheets	30,901
Non Government backed Securities | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	6,692	[1]
Fair Value	6,817
Amount at which shown in the consolidated balance sheets	6,817
Non Government backed Securities | Fixed-maturity securities | Trading Securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	5,254	[1]
Fair Value	5,168
Amount at which shown in the consolidated balance sheets	5,168
States and political subdivisions | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	10,177,673	[1]
Fair Value	11,317,726
Amount at which shown in the consolidated balance sheets	11,317,726
Foreign Government | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	523,356	[1]
Fair Value	540,613
Amount at which shown in the consolidated balance sheets	540,613
Corporate securities | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	65,145,715	[1]
Fair Value	70,045,273
Amount at which shown in the consolidated balance sheets	70,045,273
Corporate securities | Fixed-maturity securities | Trading Securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	150	[1]
Fair Value	150
Amount at which shown in the consolidated balance sheets	150
Mortgage-backed securities | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	14,297,121	[1]
Fair Value	14,425,840
Amount at which shown in the consolidated balance sheets	14,425,840
Collateralized debt obligations | Fixed-maturity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	15,243	[1]
Fair Value	27,565
Amount at which shown in the consolidated balance sheets	27,565
Other Investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	13,755,812	[1]
Fair Value	14,366,648
Amount at which shown in the consolidated balance sheets	13,755,812
Other Investments | Mortgage loans
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	11,761,939	[1]
Fair Value	12,372,775
Amount at which shown in the consolidated balance sheets	11,761,939
Other Investments | Derivative
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	1,388,190	[1]
Fair Value	1,388,190
Amount at which shown in the consolidated balance sheets	1,388,190
Other Investments | Loans Related to Affiliated Companies and Other Companies
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	39,120	[1]
Fair Value	39,120
Amount at which shown in the consolidated balance sheets	39,120
Other Investments | Policy loans
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	184,409	[1]
Fair Value	184,409
Amount at which shown in the consolidated balance sheets	184,409
Other Investments | Other invested assets
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	382,154	[1]
Fair Value	382,154
Amount at which shown in the consolidated balance sheets	382,154
Equity securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	550,290	[1]
Fair Value	586,279
Amount at which shown in the consolidated balance sheets	586,279
Equity securities | Available-for-sale securities, equity
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	261,073	[1]
Fair Value	271,909
Amount at which shown in the consolidated balance sheets	271,909
Equity securities | Fair value option and trading [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	289,217	[1]
Fair Value	314,370
Amount at which shown in the consolidated balance sheets	314,370
Equity securities | Common stocks, Industrial and miscellaneous | Available-for-sale securities, equity | Preferred Stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	259,573	[1]
Fair Value	270,409
Amount at which shown in the consolidated balance sheets	270,409
Equity securities | Common stocks, Industrial and miscellaneous | Available-for-sale securities, equity | Common stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	1,500	[1]
Fair Value	1,500
Amount at which shown in the consolidated balance sheets	1,500
Equity securities | Common stocks, Industrial and miscellaneous | Fair value option and trading [Member] | Common stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	289,217	[1]
Fair Value	314,370
Amount at which shown in the consolidated balance sheets	$ 314,370
[1]	The original cost of equity securities and other investments is reduced by impairments. The original cost of fixed-maturity securities is reduced by repayments and impairments adjusted for amortization of premiums and accrual discounts.

Schedule II Supplementary Insur

Schedule II Supplementary Insurance Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplementary Insurance Information, by Segment [Line Items]
Deferred acquisition costs	$ 3,850,840	$ 5,246,343	$ 6,283,236
Deferred sales inducements	431,318	764,554	1,110,192	$ 847,000
Account balances and future policy benefit reserves	115,774,156	105,354,460	97,314,497
Unearned premiums	98,272	145,335	154,116
Policy and contract claims	696,697	620,743	517,925
Net premium and policy fees	1,605,227	1,407,279	1,449,591
Interest and similar income, net	4,522,219	4,325,737	4,175,469
Net benefits	6,959,443	2,163,307	2,400,684
Net change in deferred sales inducements	169,796	219,871	202,410
Net change in policy acquisition costs	274,363	259,407	239,259
Other operating expenses	1,812,144	2,029,388	1,804,437
Annuities
Supplementary Insurance Information, by Segment [Line Items]
Deferred acquisition costs	3,352,997	4,704,646	5,766,176
Deferred sales inducements	431,318	763,386	1,108,877
Account balances and future policy benefit reserves	107,307,376	97,927,975	90,734,164
Unearned premiums	117	5,864	25,620
Policy and contract claims		1,731
Net premium and policy fees	1,249,793	1,117,580	1,133,285
Interest and similar income, net	4,301,602	4,133,359	3,999,693
Net benefits	6,402,287	1,763,154	2,095,788
Net change in deferred sales inducements	168,628	219,725	200,269
Net change in policy acquisition costs	313,504	315,760	279,582
Other operating expenses	1,447,911	1,737,434	1,510,369
Life
Supplementary Insurance Information, by Segment [Line Items]
Deferred acquisition costs	499,742	523,701	486,195
Deferred sales inducements		1,168	1,315
Account balances and future policy benefit reserves	3,930,018	3,172,139	2,678,431
Unearned premiums	35,824	77,790	70,621
Policy and contract claims	3,121	4,438	3,335
Net premium and policy fees	204,920	147,013	172,660
Interest and similar income, net	135,346	113,465	103,326
Net benefits	349,186	194,521	112,236
Net change in deferred sales inducements	1,168	146	2,141
Net change in policy acquisition costs	(59,168)	(69,477)	(53,642)
Other operating expenses	219,519	159,455	165,385
Questar
Supplementary Insurance Information, by Segment [Line Items]
Interest and similar income, net	68	32	3
Other operating expenses	122,990	114,009	110,624
Legacy
Supplementary Insurance Information, by Segment [Line Items]
Deferred acquisition costs	(1,899)	17,996	30,865
Account balances and future policy benefit reserves	4,536,762	4,254,346	3,901,902
Unearned premiums	62,331	61,681	57,875
Policy and contract claims	693,576	614,574	514,590
Net premium and policy fees	150,514	142,686	143,646
Interest and similar income, net	85,203	78,881	72,447
Net benefits	207,970	205,632	192,660
Net change in policy acquisition costs	20,027	13,124	13,319
Other operating expenses	$ 21,724	$ 18,490	$ 18,059

Schedule IV Reinsurance (Detail

Schedule IV Reinsurance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Life insurance face amount in force, Direct amount	$ 37,365,340	$ 33,748,978	$ 30,774,840
Life insurance face amount in force, Ceded to other companies	24,877,754	23,377,514	21,809,292
Life insurance face amount in force, Assumed from other companies	48,647	23,086	60,469
Life insurance face amount in force, Net amount	$ 12,536,233	$ 10,394,550	$ 9,026,017
Life insurance face amount in force, Percentage of amount assumed to net	0.40%	0.20%	0.70%
Premiums and policy fees, Direct amount	$ 1,687,318	$ 1,504,580	$ 1,539,358
Premiums and policy fees, Ceded to other companies	126,424	132,983	125,286
Premiums and policy fees, Assumed from other companies	44,333	35,682	35,519
Premiums and policy fees, Net Amount	$ 1,605,227	$ 1,407,279	$ 1,449,591
Premiums and policy fees, Percentage of amount assumed to net	2.80%	2.50%	2.50%
Life
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Premiums and policy fees, Direct amount	$ 275,152	$ 207,771	$ 219,959
Premiums and policy fees, Ceded to other companies	68,432	59,071	45,746
Premiums and policy fees, Assumed from other companies	686	746	683
Premiums and policy fees, Net Amount	$ 207,406	$ 149,446	$ 174,896
Premiums and policy fees, Percentage of amount assumed to net	0.30%	0.50%	0.40%
Annuities
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Premiums and policy fees, Direct amount	$ 1,229,815	$ 1,111,894	$ 1,130,514
Premiums and policy fees, Net Amount	1,247,681	1,115,983	1,131,519
Annuities | Intersegment Eliminations [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Premiums and policy fees, Ceded to other companies	(18,268)	(4,514)	(1,447)
Premiums and policy fees, Assumed from other companies	(402)	(425)	(442)
Accident and health
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Premiums and policy fees, Direct amount	182,351	184,915	188,885
Premiums and policy fees, Ceded to other companies	76,260	78,426	80,987
Premiums and policy fees, Assumed from other companies	44,049	35,361	35,278
Premiums and policy fees, Net Amount	$ 150,140	$ 141,850	$ 143,176
Premiums and policy fees, Percentage of amount assumed to net	29.30%	24.90%	24.60%