Reinsurance Group of America (RGA) 10-Q 2 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
Document And Entitiy Information [Abstract]
Document Type	10-Q
Document period end date	Sep. 30, 2016
Amendment flag	false
Entity registrant name	REINSURANCE GROUP OF AMERICA INC
Entity central index key	898,174
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well-known seasoned issuer	Yes
Common Shares Outstanding		64,207,730
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fixed maturity securities:
Available-for-sale at fair value (amortized cost of $30,097,896 and $28,322,977)	$ 33,536,419	$ 29,642,905
Mortgage loans on real estate (net of allowances of $6,746 and $6,813)	3,607,700	3,129,951
Policy loans	1,414,963	1,468,796
Funds withheld at interest	5,922,656	5,880,203
Short-term investments	126,702	558,284
Other invested assets	1,777,065	1,298,120
Total investments	46,385,505	41,978,259
Cash and cash equivalents	1,379,693	1,525,275
Accrued investment income	391,837	339,452
Premiums receivable and other reinsurance balances	1,834,362	1,797,504
Reinsurance ceded receivables	694,906	637,859
Deferred policy acquisition costs	3,406,093	3,392,437
Other assets	740,102	712,366
Total assets	54,832,498	50,383,152
Liabilities and Stockholders’ Equity
Future policy benefits	19,634,157	19,612,251
Interest-sensitive contract liabilities	14,217,831	13,663,873
Other policy claims and benefits	4,304,491	4,094,640
Other reinsurance balances	353,426	296,899
Deferred income taxes	3,071,995	2,218,328
Other liabilities	1,321,017	1,165,071
Short-term Debt	299,876	0
Long-term debt	2,788,834	2,297,548
Collateral finance and securitization notes	847,389	899,161
Total liabilities	46,839,016	44,247,771
Commitments and contingent liabilities (See Note 8)
Stockholders’ Equity:
Preferred stock - par value $.01 per share, 10,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock - par value $.01 per share, 140,000,000 shares authorized, 79,137,758 shares issued at September 30, 2016 and December 31, 2015	791	791
Additional paid-in capital	1,842,390	1,816,142
Retained earnings	5,039,470	4,620,303
Treasury stock, at cost - 14,931,485 and 13,933,232 shares	(1,101,495)	(1,010,139)
Accumulated other comprehensive income	2,212,326	708,284
Total stockholders’ equity	7,993,482	6,135,381
Total liabilities and stockholders’ equity	$ 54,832,498	$ 50,383,152

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Available for Sale at Fair value - Amortized cost	$ 30,097,896	$ 28,322,977
Preferred stock par value (per share)	$ 0.01	$ 0.01
Preferred stock shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock par value (per share)	$ 0.01	$ 0.01
Common stock shares authorized	140,000,000	140,000,000
Common Stock, Shares, Issued	79,137,758	79,137,758
Common stock shares outstanding	64,206,273	65,204,526
Treasury stock, shares	14,931,485	13,933,232
Allowances for Loan and Lease Losses, Real Estate	$ 6,746	$ 6,813

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Net premiums	$ 2,251,758	$ 2,089,345	$ 6,755,708	$ 6,242,240
Investment income, net of related expenses	489,727	389,597	1,414,659	1,267,027
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	0	(23,111)	(34,663)	(29,775)
Other investment related gains (losses), net	86,624	(88,235)	118,665	(90,166)
Total investment related gains (losses), net	86,624	(111,346)	84,002	(119,941)
Other revenues	72,468	71,038	197,844	200,261
Total revenues	2,900,577	2,438,634	8,452,213	7,589,587
Benefits and Expenses:
Claims and other policy benefits	1,993,064	1,831,819	5,877,330	5,473,453
Interest credited	116,848	34,008	300,602	231,932
Policy acquisition costs and other insurance expenses	300,962	249,702	940,406	827,157
Other operating expenses	152,556	142,270	469,875	395,488
Interest expense	43,063	35,565	96,201	107,043
Collateral finance and securitization expense	6,484	5,133	19,396	16,462
Total benefits and expenses	2,612,977	2,298,497	7,703,810	7,051,535
Income before income taxes	287,600	140,137	748,403	538,052
Provision for income taxes	88,881	56,603	237,109	199,013
Net income	$ 198,719	$ 83,534	$ 511,294	$ 339,039
Earnings per share:
Basic earnings per share	$ 3.10	$ 1.26	$ 7.95	$ 5.07
Diluted earnings per share	3.07	1.25	7.87	5.01
Dividends declared per share	$ 0.41	$ 0.37	$ 1.15	$ 1.03

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Comprehensive income (loss)
Net income	$ 198,719	$ 83,534	$ 511,294	$ 339,039
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(28,233)	(105,504)	59,442	(201,340)
Net unrealized investment gains	254,658	(139,066)	1,445,776	(552,783)
Defined benefit pension and postretirement plan adjustments	527	1,685	(1,176)	3,473
Total other comprehensive income (loss), net of tax	226,952	(242,885)	1,504,042	(750,650)
Total comprehensive income (loss)	$ 425,671	$ (159,351)	$ 2,015,336	$ (411,611)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 511,294	$ 339,039
Change in operating assets and liabilities:
Accrued investment income	(58,863)	(47,088)
Premiums receivable and other reinsurance balances	(3,619)	(100,804)
Deferred policy acquisition costs	(15,059)	(42,855)
Reinsurance ceded receivable balances	(77,741)	(42,620)
Future policy benefits, other policy claims and benefits, and other reinsurance balances	479,606	594,389
Deferred income taxes	165,988	128,557
Other assets and other liabilities, net	29,343	(14,670)
Amortization of net investment premiums, discounts and other	(55,967)	(61,714)
Investment related (gains) losses, net	(84,002)	119,941
Excess Tax Benefit from Share-based Compensation, Operating Activities	0	(2,884)
Other, net	128,892	9,175
Net cash provided by operating activities	1,019,872	878,466
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	3,649,187	3,904,948
Maturities of fixed maturity securities available-for-sale	349,836	342,126
Proceeds from Sale of Available-for-sale Securities, Equity	331,978	63,797
Payments to Acquire Mortgage Notes Receivable	(377,671)	(223,807)
Payments to Fund Policy Loans	(59,518)	(531)
Payments to Acquire Available-for-sale Securities, Debt	5,938,302	3,746,290
Payments to Acquire Available-for-sale Securities, Equity	523,499	75,396
Proceeds from Sale and Collection of Mortgage Notes Receivable	(857,445)	(686,878)
Payments for (Proceeds from) Policy Loans	5,685	6,628
Increase (Decrease) in Funds Held under Reinsurance Agreements	31,222	63,390
Payments to Acquire Businesses, Net of Cash Acquired	0	195,151
Payments to Acquire Property, Plant, and Equipment	0	(24,240)
Increase (Decrease) in Payables under Repurchase Agreements	0	(101,203)
Change in short-term investments	418,625	35,014
Change in other invested assets	(78,068)	144,011
Net cash used in investing activities	(2,247,406)	(184,942)
Cash Flows from Financing Activities:
Dividends to stockholders	(74,034)	(69,111)
Proceeds from (Repayments of) Secured Debt	(60,971)	(19,732)
Proceeds from Issuance of Secured Debt	0	160,060
Proceeds from Issuance of Long-term Debt	799,984	0
Payments of Debt Issuance Costs	(9,026)	(1,074)
Repayments of Long-term Debt	(1,850)	(1,776)
Purchases of treasury stock	(121,896)	(333,432)
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	2,884
Exercise of stock options, net	11,752	12,551
Change in cash collateral for derivative positions and other arrangements	24,749	60,202
Deposits on universal life and other investment type policies and contracts	874,708	204,456
Withdrawals on universal life and other investment type policies and contracts	(386,900)	(556,821)
Net cash provided by (used in) financing activities	1,056,516	(541,793)
Effect of exchange rate changes on cash	25,436	(49,708)
Change in cash and cash equivalents	(145,582)	102,023
Cash and cash equivalents, beginning of period	1,525,275	1,645,669
Cash and cash equivalents, end of period	1,379,693	1,747,692
Supplemental disclosures of cash flow information:
Interest Paid, Net	114,043	103,481
Income Taxes Paid, Net	47,312	13,494
Transfer to Investments	3,621	342,082
Capital Expenditures Incurred but Not yet Paid	0	804
Noncash or Part Noncash Acquisition, Value of Assets Acquired	0	3,685,708
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	0	(3,490,557)
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 195,151

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS PARENTHETICAL $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 19,377

Business and Basis of Presentat

Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Business and Basis of Presentation Reinsurance Group of America, Incorporated (“RGA”) is an insurance holding company that was formed on December 31, 1992. The accompanying unaudited condensed consolidated financial statements of RGA and its subsidiaries (collectively, the “Company”) have been prepared in conformity with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments, including normal recurring adjustments necessary for a fair presentation have been included. Results for the nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . These unaudited condensed consolidated financial statements include the accounts of RGA and its subsidiaries, and all intercompany accounts and transactions have been eliminated. These condensed consolidated statements should be read in conjunction with the Company’s 2015 Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 29, 2016 (the "2015 Annual Report").

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Earnings: Net income (numerator for basic and diluted calculations) $ 198,719 $ 83,534 $ 511,294 $ 339,039 Shares: Weighted average outstanding shares (denominator for basic calculation) 64,146 66,205 64,281 66,895 Equivalent shares from outstanding stock options 669 677 663 749 Denominator for diluted calculation 64,815 66,882 64,944 67,644 Earnings per share: Basic $ 3.10 $ 1.26 $ 7.95 $ 5.07 Diluted $ 3.07 $ 1.25 $ 7.87 $ 5.01 The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended September 30, 2016 , no stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. For the three months ended September 30, 2015 , no stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. Year-to-date amounts for equivalent shares from outstanding stock options and performance contingent shares are the weighted average of the individual quarterly amounts.

Equity

Equity	9 Months Ended
	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Equity Common Stock The changes in number of common stock shares, issued, held in treasury and outstanding are as follows for the periods indicated: Issued Held In Treasury Outstanding Balance, December 31, 2015 79,137,758 13,933,232 65,204,526 Common stock acquired — 1,356,892 (1,356,892 ) Stock-based compensation (1) — (358,639 ) 358,639 Balance, September 30, 2016 79,137,758 14,931,485 64,206,273 Issued Held In Treasury Outstanding Balance, December 31, 2014 79,137,758 10,364,797 68,772,961 Common stock acquired — 3,573,797 (3,573,797 ) Stock-based compensation (1) — (550,237 ) 550,237 Balance, September 30, 2015 79,137,758 13,388,357 65,749,401 (1) Represents net shares issued from treasury pursuant to the Company's equity-based compensation programs. Common Stock Held in Treasury Common stock held in treasury is accounted for at average cost. Gains resulting from the reissuance of common stock held in treasury are credited to additional paid-in capital. Losses resulting from the reissuance of common stock held in treasury are charged first to additional paid-in capital to the extent the Company has previously recorded gains on treasury share transactions, then to retained earnings. On January 21, 2016, RGA's board of directors authorized a share repurchase program for up to $400.0 million of RGA's outstanding common stock. The authorization was effective immediately and does not have an expiration date. In connection with this new authorization, the board of directors terminated the stock repurchase authority granted in 2015. During the first nine months of 2016, RGA repurchased 1.4 million shares of common stock under this program for $116.5 million . Accumulated Other Comprehensive Income (Loss) The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the nine months ended September 30, 2016 and 2015 are as follows (dollars in thousands): AOCI, Net of Income Tax Accumulated Currency Translation Adjustments Unrealized Appreciation (Depreciation) of Investments (1) Pension and Postretirement Benefits Total Balance, December 31, 2015 $ (181,151 ) $ 935,697 $ (46,262 ) $ 708,284 Other comprehensive income (loss) before reclassifications 68,271 2,191,823 (6,079 ) 2,254,015 Amounts reclassified to (from) AOCI — (109,145 ) 4,253 (104,892 ) Deferred income tax benefit (expense) (8,829 ) (636,902 ) 650 (645,081 ) Balance, September 30, 2016 $ (121,709 ) $ 2,381,473 $ (47,438 ) $ 2,212,326 AOCI, Net of Income Tax Accumulated Currency Translation Adjustments Unrealized Appreciation (Depreciation) of Investments (1) Pension and Postretirement Benefits Total Balance, December 31, 2014 $ 81,847 $ 1,624,773 $ (49,491 ) $ 1,657,129 Other comprehensive income (loss) before reclassifications (176,562 ) (843,541 ) 1,254 (1,018,849 ) Amounts reclassified to (from) AOCI — 34,790 4,002 38,792 Deferred income tax benefit (expense) (24,778 ) 255,968 (1,783 ) 229,407 Balance, September 30, 2015 $ (119,493 ) $ 1,071,990 $ (46,018 ) $ 906,479 (1) Includes cash flow hedges of $(40,597) and $(29,397) as of September 30, 2016 and December 31, 2015 , respectively, and $(37,167) and $(31,591) as of September 30, 2015 and December 31, 2014 , respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges. The following table presents the amounts of AOCI reclassifications for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Amount Reclassified from AOCI Three months ended September 30, Nine months ended September 30, Details about AOCI Components 2016 2015 2016 2015 Affected Line Item in Statements of Income Net unrealized investment gains (losses): Net unrealized gains (losses) on available-for-sale securities $ 72,351 $ (31,506 ) $ 84,250 $ (26,598 ) Investment related gains (losses), net Cash flow hedges - Interest rate swaps 200 (60 ) 454 231 (1) Cash flow hedges - Forward bond purchase commitments 137 127 (120 ) 1,094 (1) Deferred policy acquisition costs attributed to unrealized gains and losses 12,090 (9,543 ) 24,561 (9,517 ) (2) Total 84,778 (40,982 ) 109,145 (34,790 ) Provision for income taxes (27,680 ) 13,948 (32,676 ) 13,410 Net unrealized gains (losses), net of tax $ 57,098 $ (27,034 ) $ 76,469 $ (21,380 ) Amortization of defined benefit plan items: Prior service cost $ 391 $ (82 ) $ 238 $ (245 ) (3) Actuarial gains (losses) (1,177 ) (1,955 ) (4,491 ) (3,757 ) (3) Total (786 ) (2,037 ) (4,253 ) (4,002 ) Provision for income taxes 276 713 1,489 1,401 Amortization of defined benefit plans, net of tax $ (510 ) $ (1,324 ) $ (2,764 ) $ (2,601 ) Total reclassifications for the period $ 56,588 $ (28,358 ) $ 73,705 $ (23,981 ) (1) See Note 5 - "Derivative Instruments" for additional information on cash flow hedges. (2) This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2015 Annual Report for additional details. (3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional deta

Investments

Investments	9 Months Ended
	Sep. 30, 2016
Investments [Abstract]
Investments	Investments Fixed Maturity and Equity Securities Available-for-Sale The following tables provide information relating to investments in fixed maturity and equity securities by sector as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 18,762,648 $ 1,498,816 $ 96,616 $ 20,164,848 60.2 % $ — Canadian and Canadian provincial governments 2,598,625 1,541,754 — 4,140,379 12.3 — Residential mortgage-backed securities 1,247,677 67,854 3,839 1,311,692 3.9 (300 ) Asset-backed securities 1,388,263 13,706 19,395 1,382,574 4.1 275 Commercial mortgage-backed securities 1,402,249 73,402 618 1,475,033 4.4 (1,609 ) U.S. government and agencies 1,479,295 80,402 161 1,559,536 4.7 — State and political subdivisions 549,669 72,598 4,418 617,849 1.8 — Other foreign government, supranational and foreign government-sponsored enterprises 2,669,470 220,274 5,236 2,884,508 8.6 — Total fixed maturity securities $ 30,097,896 $ 3,568,806 $ 130,283 $ 33,536,419 100.0 % $ (1,634 ) Non-redeemable preferred stock $ 56,944 $ 2,512 $ 6,604 $ 52,852 12.6 % Other equity securities 360,839 7,013 456 367,396 87.4 Total equity securities $ 417,783 $ 9,525 $ 7,060 $ 420,248 100.0 % December 31, 2015: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 17,575,507 $ 599,718 $ 467,069 $ 17,708,156 59.7 % $ — Canadian and Canadian provincial governments 2,469,009 1,110,282 2,532 3,576,759 12.1 — Residential mortgage-backed securities 1,277,998 45,152 11,673 1,311,477 4.4 (300 ) Asset-backed securities 1,219,000 12,052 18,376 1,212,676 4.1 354 Commercial mortgage-backed securities 1,456,848 37,407 11,168 1,483,087 5.0 (1,609 ) U.S. government and agencies 1,423,791 15,586 57,718 1,381,659 4.7 — State and political subdivisions 480,067 40,014 9,067 511,014 1.7 — Other foreign government, supranational and foreign government-sponsored enterprises 2,420,757 78,964 41,644 2,458,077 8.3 — Total fixed maturity securities $ 28,322,977 $ 1,939,175 $ 619,247 $ 29,642,905 100.0 % $ (1,555 ) Non-redeemable preferred stock $ 85,645 $ 7,837 $ 5,962 $ 87,520 69.5 % Other equity securities 40,584 — 2,242 38,342 30.5 Total equity securities $ 126,229 $ 7,837 $ 8,204 $ 125,862 100.0 % The Company enters into various collateral arrangements with counterparties that require both the pledging and acceptance of fixed maturity securities as collateral. Pledged fixed maturity securities are included in fixed maturity securities, available-for-sale in the condensed consolidated balance sheets. Fixed maturity securities received as collateral are held in separate custodial accounts and are not recorded on the Company’s condensed consolidated balance sheets. Subject to certain constraints, the Company is permitted by contract to sell or repledge collateral it receives; however, as of September 30, 2016 and December 31, 2015 , none of the collateral received had been sold or repledged. The Company also holds assets in trust to satisfy collateral requirements under certain third-party reinsurance treaties. The following table includes fixed maturity securities pledged and received as collateral and assets in trust held to satisfy collateral requirements under certain third-party reinsurance treaties as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities pledged as collateral $ 191,791 $ 201,124 $ 169,678 $ 176,782 Fixed maturity securities received as collateral n/a 320,838 n/a 242,914 Assets in trust held to satisfy collateral requirements 12,258,854 13,525,565 10,535,729 10,928,393 The Company monitors its concentrations of financial instruments on an ongoing basis and mitigates credit risk by maintaining a diversified investment portfolio which limits exposure to any one issuer. The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of September 30, 2016 and December 31, 2015 (dollars in thousands). September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities guaranteed or issued by: Canadian province of Ontario $ 843,239 $ 1,254,701 $ 864,444 $ 1,199,080 Canadian province of Quebec 1,021,325 1,877,335 943,484 1,525,903 The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at September 30, 2016 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date. Amortized Cost Estimated Fair Value Available-for-sale: Due in one year or less $ 728,318 $ 733,750 Due after one year through five years 6,519,471 6,847,608 Due after five years through ten years 8,991,047 9,689,531 Due after ten years 9,820,871 12,096,231 Asset and mortgage-backed securities 4,038,189 4,169,299 Total $ 30,097,896 $ 33,536,419 Corporate Fixed Maturity Securities The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016: Estimated Amortized Cost Fair Value % of Total Finance $ 6,530,758 $ 6,916,195 34.4 % Industrial 10,241,489 11,028,232 54.6 Utility 1,990,401 2,220,421 11.0 Total $ 18,762,648 $ 20,164,848 100.0 % December 31, 2015: Estimated Amortized Cost Fair Value % of Total Finance $ 5,408,791 $ 5,555,044 31.4 % Industrial 10,211,426 10,129,917 57.2 Utility 1,955,290 2,023,195 11.4 Total $ 17,575,507 $ 17,708,156 100.0 % Other-Than-Temporary Impairments - Fixed Maturity and Equity Securities As discussed in Note 2 – “Summary of Significant Accounting Policies” of the 2015 Annual Report, a portion of certain other-than-temporary impairment (“OTTI”) losses on fixed maturity securities is recognized in AOCI. For these securities, the net amount recognized in the condensed consolidated statements of income (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in AOCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,974 $ 7,284 $ 7,284 $ 7,284 Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period — — (310 ) — Balance, end of period $ 6,974 $ 7,284 $ 6,974 $ 7,284 Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale The following table presents the total gross unrealized losses for the 755 and 2,080 fixed maturity and equity securities as of September 30, 2016 and December 31, 2015 , respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands): September 30, 2016 December 31, 2015 Gross Unrealized Losses % of Total Gross Unrealized Losses % of Total Less than 20% $ 88,034 64.1 % $ 463,109 73.8 % 20% or more for less than six months 12,551 9.1 142,495 22.7 20% or more for six months or greater 36,758 26.8 21,847 3.5 Total $ 137,343 100.0 % $ 627,451 100.0 % The Company’s determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company’s credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment. In the Company’s impairment review process, the duration and severity of an unrealized loss position for equity securities are given greater weight and consideration given the lack of contractual cash flows or deferability features. The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 755 and 2,080 fixed maturity and equity securities that have estimated fair values below amortized cost as of September 30, 2016 and December 31, 2015 , respectively (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost. Less than 12 months 12 months or greater Total Gross Gross Gross September 30, 2016: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 775,973 $ 11,522 $ 567,398 $ 29,794 $ 1,343,371 $ 41,316 Residential mortgage-backed securities 85,970 593 107,240 3,236 193,210 3,829 Asset-backed securities 341,260 4,816 314,518 11,488 655,778 16,304 Commercial mortgage-backed securities 51,965 193 22,415 425 74,380 618 U.S. government and agencies 86,499 161 — — 86,499 161 State and political subdivisions 53,229 841 13,141 3,577 66,370 4,418 Other foreign government, supranational and foreign government-sponsored enterprises 131,702 1,077 51,862 2,340 183,564 3,417 Total investment grade securities 1,526,598 19,203 1,076,574 50,860 2,603,172 70,063 Below investment grade securities: Corporate securities 314,962 9,132 168,865 46,168 483,827 55,300 Residential mortgage-backed securities — — 369 10 369 10 Asset-backed securities 5,858 731 14,707 2,360 20,565 3,091 Other foreign government, supranational and foreign government-sponsored enterprises 6,194 22 42,501 1,797 48,695 1,819 Total below investment grade securities 327,014 9,885 226,442 50,335 553,456 60,220 Total fixed maturity securities $ 1,853,612 $ 29,088 $ 1,303,016 $ 101,195 $ 3,156,628 $ 130,283 Non-redeemable preferred stock $ 3,413 $ 96 $ 23,786 $ 6,508 $ 27,199 $ 6,604 Other equity securities 96,635 210 6,806 246 103,441 456 Total equity securities $ 100,048 $ 306 $ 30,592 $ 6,754 $ 130,640 $ 7,060 Less than 12 months 12 months or greater Total Gross Gross Gross December 31, 2015: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 6,388,148 $ 323,961 $ 294,755 $ 40,861 $ 6,682,903 $ 364,822 Canadian and Canadian provincial governments 122,746 2,532 — — 122,746 2,532 Residential mortgage-backed securities 452,297 7,036 82,314 4,057 534,611 11,093 Asset-backed securities 581,701 9,825 199,298 7,100 780,999 16,925 Commercial mortgage-backed securities 514,877 9,806 31,177 997 546,054 10,803 U.S. government and agencies 1,010,387 57,718 — — 1,010,387 57,718 State and political subdivisions 157,837 5,349 13,016 3,718 170,853 9,067 Other foreign government, supranational and foreign government-sponsored enterprises 702,962 18,279 38,379 4,206 741,341 22,485 Total investment grade securities 9,930,955 434,506 658,939 60,939 10,589,894 495,445 Below investment grade securities: Corporate securities 554,688 71,171 114,427 31,076 669,115 102,247 Residential mortgage-backed securities 22,646 282 7,679 298 30,325 580 Asset-backed securities 6,772 201 9,335 1,250 16,107 1,451 Commercial mortgage-backed securities 3,253 248 767 117 4,020 365 Other foreign government, supranational and foreign government-sponsored enterprises 60,668 7,356 31,693 11,803 92,361 19,159 Total below investment grade securities 648,027 79,258 163,901 44,544 811,928 123,802 Total fixed maturity securities $ 10,578,982 $ 513,764 $ 822,840 $ 105,483 $ 11,401,822 $ 619,247 Non-redeemable preferred stock $ 12,331 $ 2,175 $ 12,191 $ 3,787 $ 24,522 $ 5,962 Other equity securities 38,327 2,242 — — 38,327 2,242 Total equity securities $ 50,658 $ 4,417 $ 12,191 $ 3,787 $ 62,849 $ 8,204 The Company has no intention to sell, nor does it expect to be required to sell, the securities outlined in the table above, as of the dates indicated. However, unforeseen facts and circumstances may cause the Company to sell fixed maturity and equity securities in the ordinary course of managing its portfolio to meet certain diversification, credit quality and liquidity guidelines. Unrealized losses on below investment grade securities as of September 30, 2016 are primarily related to high-yield corporate securities. Unrealized losses decreased across most security types as treasury rates decreased during the first nine months of 2016. Investment Income, Net of Related Expenses Major categories of investment income, net of related expenses, consist of the following (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Fixed maturity securities available-for-sale $ 325,089 $ 298,376 $ 961,096 $ 871,936 Mortgage loans on real estate 39,802 36,547 121,494 108,440 Policy loans 15,391 16,475 47,897 46,763 Funds withheld at interest 104,609 40,382 273,482 239,967 Short-term investments 952 576 2,912 2,085 Other invested assets 21,938 13,696 61,249 48,141 Investment income 507,781 406,052 1,468,130 1,317,332 Investment expense (18,054 ) (16,455 ) (53,471 ) (50,305 ) Investment income, net of related expenses $ 489,727 $ 389,597 $ 1,414,659 $ 1,267,027 Investment Related Gains (Losses), Net Investment related gains (losses), net consist of the following (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Fixed maturity and equity securities available for sale: Other-than-temporary impairment losses on fixed maturity securities recognized in earnings $ — $ (23,111 ) $ (34,663 ) $ (29,775 ) Gain on investment activity 46,346 13,792 127,153 53,002 Loss on investment activity (9,054 ) (22,186 ) (43,397 ) (50,257 ) Other impairment losses and change in mortgage loan provision (262 ) (636 ) (2,111 ) (4,661 ) Derivatives and other, net 49,594 (79,205 ) 37,020 (88,250 ) Total investment related gains (losses), net $ 86,624 $ (111,346 ) $ 84,002 $ (119,941 ) The fixed maturity impairments for the nine months ended September 30, 2016 were largely related to high-yield energy and emerging market corporate securities. The fixed maturity impairments for the three and nine months ended September 30, 2015 were largely related to high-yield energy and emerging market corporate securities. The fluctuations in investment related gains (losses) for derivatives and other for the three and nine months ended September 30, 2016 , compared to the same periods in 2015 , are primarily due to changes in the fair value of embedded derivatives and interest rate swaps. During the three months ended September 30, 2016 and 2015 , the Company sold fixed maturity and equity securities with fair values of $317.3 million and $404.1 million at losses of $9.1 million and $22.2 million , respectively. During the nine months ended September 30, 2016 and 2015 , the Company sold fixed maturity and equity securities with fair values of $903.1 million and $1,255.0 million at losses of $43.4 million and $50.3 million , respectively. The Company generally does not buy and sell securities on a short-term basis. Securities Borrowing, Lending and Other The Company participates in securities borrowing programs whereby securities, which are not reflected on the Company’s condensed consolidated balance sheets, are borrowed from third parties. The borrowed securities are used to provide collateral under affiliated reinsurance transactions. The Company is required to maintain a minimum of 100% of the fair value, or par value, under certain programs, of the borrowed securities as collateral. The collateral consists of rights to reinsurance treaty cash flows. If cash flows from the reinsurance treaties are insufficient to maintain the minimum collateral requirement, the Company may substitute cash or securities to meet the requirement. No cash or securities have been pledged by the Company for this purpose. The Company also participates in a securities lending program whereby securities, reflected as investments on the Company's condensed consolidated balance sheets, are loaned to a third party. The Company receives securities as collateral, in an amount equal to a minimum of 105% of the fair value of the securities lent. The securities received are not reflected on the Company’s condensed consolidated balance sheets. The Company also participates in a repurchase/reverse repurchase program in which securities, reflected as investments on the Company’s condensed consolidated balance sheets, are pledged to a third party. In return, the Company receives securities from the third party with an estimated fair value equal to a minimum of 100% of the securities pledged. The securities received are not reflected on the Company’s condensed consolidated balance sheets. The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of September 30, 2016 and December 31, 2015 (dollars in thousands). September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Borrowed securities $ 267,360 $ 288,310 $ 259,540 $ 266,297 Securities lending: Securities loaned 60,375 62,104 — — Securities received n/a 65,000 n/a — Repurchase program/reverse repurchase program: Securities pledged 442,510 475,820 443,435 465,889 Securities received n/a 514,052 n/a 481,197 The following table presents information on the Company's securities lending and repurchase transactions as of September 30, 2016 and December 31, 2015 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table, as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows. September 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Securities lending transactions: Corporate securities $ — $ — $ — $ 62,104 $ 62,104 Total — — — 62,104 62,104 Repurchase transactions: Corporate securities — 3,906 5,239 133,551 142,696 Residential mortgage-backed securities — — — 98,884 98,884 U.S. government and agencies — — 30,011 181,754 211,765 Foreign government — — — 15,941 15,941 Other 6,534 — — — 6,534 Total 6,534 3,906 35,250 430,130 475,820 Total transactions $ 6,534 $ 3,906 $ 35,250 $ 492,234 $ 537,924 Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table $ 579,052 Amounts related to agreements not included in offsetting disclosure $ 41,128 December 31, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase transactions: Corporate securities $ — $ 2,951 $ — $ 147,324 $ 150,275 Residential mortgage-backed securities — — — 97,639 97,639 U.S. government and agencies — — — 199,431 199,431 Foreign government — — — 3,358 3,358 Other 15,186 — — — 15,186 Total transactions $ 15,186 $ 2,951 $ — $ 447,752 $ 465,889 Gross amount of recognized liabilities for repurchase agreement in preceding table $ 481,197 Amounts related to agreements not included in offsetting disclosure $ 15,308 The Company has elected to offset amounts recognized as receivables and payables resulting from the repurchase/reverse repurchase program. After the effect of offsetting, the net amount presented on the condensed consolidated balance sheet as of September 30, 2016 was a liability of $3.3 million . Amounts owed to and due from the counterparties may be settled in cash or offset, in accordance with the agreements. Mortgage Loans on Real Estate Mortgage loans represented approximately 7.8% and 7.5% of the Company’s total investments as of September 30, 2016 and December 31, 2015 . The Company makes mortgage loans on income producing properties that are geographically diversified, with the largest concentration being in the state of California, which represented 23.4% and 22.3% of mortgage loans on real estate as of September 30, 2016 and December 31, 2015 , respectively. Loan-to-value ratios at the time of loan approval are 75% or less. The distribution of mortgage loans by property type, gross of valuation allowances, is as follows as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Property type: Recorded Investment % of Total Recorded % of Total Office building $ 1,173,087 32.4 % $ 980,858 31.3 % Retail 1,116,602 30.9 1,026,018 32.7 Industrial 703,407 19.5 527,485 16.8 Apartment 436,290 12.1 420,014 13.4 Other commercial 185,060 5.1 182,389 5.8 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 % The maturities of the mortgage loans, gross of valuation allowances, as of September 30, 2016 and December 31, 2015 are as follows (dollars in thousands): September 30, 2016 December 31, 2015 Recorded Investment % of Total Recorded Investment % of Total Due within five years $ 793,736 22.0 % $ 873,280 27.8 % Due after five years through ten years 1,952,001 54.0 1,561,535 49.8 Due after ten years 868,709 24.0 701,949 22.4 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 % Information regarding the Company’s credit quality indicators, as determined by the Company's internal evaluation methodology for its recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2016 and December 31, 2015 is as follows (dollars in thousands): September 30, 2016 December 31, 2015 Internal credit quality grade: Recorded Investment % of Total Recorded Investment % of Total High investment grade $ 2,097,202 58.0 % $ 1,621,601 51.7 % Investment grade 1,430,439 39.6 1,397,996 44.6 Average 44,097 1.2 87,196 2.8 Watch list 35,794 1.0 13,550 0.4 In or near default 6,914 0.2 16,421 0.5 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 % None of the payments due to the Company on its recorded investment in mortgage loans were delinquent as of September 30, 2016 and December 31, 2015 . The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Mortgage loans: Individually measured for impairment $ 6,913 $ 16,421 Collectively measured for impairment 3,607,533 3,120,343 Mortgage loans, gross of valuation allowances 3,614,446 3,136,764 Valuation allowances: Individually measured for impairment — 588 Collectively measured for impairment 6,746 6,225 Total valuation allowances 6,746 6,813 Mortgage loans, net of valuation allowances $ 3,607,700 $ 3,129,951 Information regarding the Company’s loan valuation allowances for mortgage loans for the three and nine months ended September 30, 2016 and 2015 is as follows (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,499 $ 5,942 $ 6,813 $ 6,471 Provision (release) 247 (290 ) (67 ) (819 ) Balance, end of period $ 6,746 $ 5,652 $ 6,746 $ 5,652 Information regarding the portion of the Company’s mortgage loans that were impaired as of September 30, 2016 and December 31, 2015 is as follows (dollars in thousands): Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value September 30, 2016: Impaired mortgage loans with no valuation allowance recorded $ 7,416 $ 6,913 $ — $ 6,913 Impaired mortgage loans with valuation allowance recorded — — — — Total impaired mortgage loans $ 7,416 $ 6,913 $ — $ 6,913 December 31, 2015: Impaired mortgage loans with no valuation allowance recorded $ 4,033 $ 4,033 $ — $ 4,033 Impaired mortgage loans with valuation allowance recorded 12,898 12,388 588 11,800 Total impaired mortgage loans $ 16,931 $ 16,421 $ 588 $ 15,833 The Company’s average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands): Three months ended September 30, 2016 2015 Average (1) Interest Income Average Recorded Investment (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 6,953 $ 107 $ 6,364 $ 71 Impaired mortgage loans with valuation allowance recorded — — 12,495 194 Total impaired mortgage loans $ 6,953 $ 107 $ 18,859 $ 265 Nine months ended September 30, 2016 2015 Average (1) Interest Income Average (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 4,687 $ 324 $ 6,533 $ 212 Impaired mortgage loans with valuation allowance recorded 5,459 — 11,392 578 Total impaired mortgage loans $ 10,146 $ 324 $ 17,925 $ 790 (1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances. The Company did not acquire any impaired mortgage loans during the nine months ended September 30, 2016 and 2015 . The Company had no mortgage loans that were on a nonaccrual status at September 30, 2016 and December 31, 2015 . Policy Loans Policy loans comprised approximately 3.1% and 3.5% of the Company’s total investments as of September 30, 2016 and December 31, 2015 , respectively, the majority of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due to the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. The Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities. Funds Withheld at Interest Funds withheld at interest comprised approximately 12.8% and 14.0% of the Company’s total investments as of September 30, 2016 and December 31, 2015 , respectively. Of the $5.9 billion funds withheld at interest balance, net of embedded derivatives, as of September 30, 2016 , $4.0 billion of the balance is associated with one client. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance funds withheld basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company and are reflected as funds withheld at interest on the Company’s condensed consolidated balance sheets. In the event of a ceding company’s insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances against amounts owed to the Company from the ceding company. Other Invested Assets Other invested assets include equity securities, limited partnership interests, joint ventures (other than operating joint ventures), derivative contracts and fair value option ("FVO") contractholder-directed unit-linked investments. Other invested assets also include Federal Home Loan Bank of Des Moines ("FHLB") common stock, real estate held-for-investment, equity release mortgages and structured loans, all of which are included in other in the table below. The fair value option was elected for contractholder-directed investments supporting unit-linked variable annuity type liabilities which do not qualify for presentation and reporting as separate accounts. Other invested assets represented approximately 3.8% and 3.1% of the Company’s total investments as of September 30, 2016 and December 31, 2015 , respectively. Carrying values of these assets as of September 30, 2016 and December 31, 2015 are as follows (dollars in thousands): September 30, 2016 December 31, 2015 Equity securities $ 420,248 $ 125,862 Limited partnership interests and real estate joint ventures 671,577 567,697 Derivatives 310,168 256,178 FVO contractholder-directed unit-linked investments 200,208 197,547 Other 174,864 150,836 Total other invested assets $ 1,777,065 $ 1,298,120

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Derivatives, except for embedded derivatives and longevity and mortality swaps, are carried on the Company’s condensed consolidated balance sheets in other invested assets or other liabilities, at fair value. Longevity and mortality swaps are included on the condensed consolidated balance sheets in other assets or other liabilities, at fair value. Embedded derivative liabilities on modified coinsurance or funds withheld arrangements are included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value. Embedded derivative liabilities on indexed annuity and variable annuity products are included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Notional Carrying Value/Fair Value Notional Carrying Value/Fair Value Amount Assets Liabilities Amount Assets Liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,062,745 $ 175,123 $ 821 $ 1,123,057 $ 85,075 $ 4,196 Financial futures 552,384 — — 420,665 — — Foreign currency forwards 30,000 173 2,733 45,000 44 6,768 Consumer price index swaps 30,043 13 460 28,561 — 292 Credit default swaps 909,000 10,605 3,430 897,000 8,230 11,053 Equity options 610,792 48,162 — 453,435 46,653 — Longevity swaps 898,800 27,029 — 868,960 15,003 7 Mortality swaps 50,000 — 2,068 50,000 — 2,619 Synthetic guaranteed investment contracts 8,726,370 — — 7,098,825 — — Embedded derivatives in: Modified coinsurance or funds withheld arrangements — — 42,903 — — 76,698 Indexed annuity products — — 854,564 — — 878,114 Variable annuity products — — 275,560 — — 192,470 Total non-hedging derivatives 12,870,134 261,105 1,182,539 10,985,503 155,005 1,172,217 Derivatives designated as hedging instruments: Interest rate swaps 435,000 — 41,306 120,000 — 29,986 Foreign currency swaps 937,284 102,667 1,205 823,486 146,265 — Total hedging derivatives 1,372,284 102,667 42,511 943,486 146,265 29,986 Total derivatives $ 14,242,418 $ 363,772 $ 1,225,050 $ 11,928,989 $ 301,270 $ 1,202,203 Netting Arrangements Certain of the Company’s derivatives are subject to enforceable master netting arrangements and reported as a net asset or liability in the condensed consolidated balance sheets. The Company nets all derivatives that are subject to such arrangements. The Company has elected to include all derivatives, except embedded derivatives, in the tables below, irrespective of whether they are subject to an enforceable master netting arrangement or a similar agreement. See Note 4 – "Investments" for information regarding the Company’s securities borrowing, lending, repurchase and repurchase/reverse repurchase programs. See “Embedded Derivatives” below for information regarding the Company’s bifurcated embedded derivatives. The following table provides information relating to the Company’s derivative instruments as of September 30, 2016 and December 31, 2015 (dollars in thousands): 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) Cash Collateral Pledged/ Received Net Amount September 30, 2016: Derivative assets $ 363,772 $ (26,575 ) $ 337,197 $ (48,024 ) $ (305,658 ) $ (16,485 ) Derivative liabilities 52,023 (26,575 ) 25,448 (74,680 ) (20,078 ) (69,310 ) December 31, 2015: Derivative assets $ 301,270 $ (30,096 ) $ 271,174 $ (20,888 ) $ (245,038 ) $ 5,248 Derivative liabilities 54,921 (30,096 ) 24,825 (47,149 ) (12,540 ) (34,864 ) (1) Includes initial margin posted to a central clearing partner. Accounting for Derivative Instruments and Hedging Activities The Company does not enter into derivative instruments for speculative purposes. As discussed below under “Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging,” the Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. As of September 30, 2016 and December 31, 2015 , the Company held interest rate swaps that were designated and qualified as cash flow hedges of interest rate risk for variable rate liabilities and foreign currency assets, foreign currency swaps that were designated and qualified as hedges of a portion of its net investment in its foreign operations, foreign currency swaps that were designated and qualified as fair value hedges of foreign currency risk, and derivative instruments that were not designated as hedging instruments. See Note 2 – “Summary of Significant Accounting Policies” of the Company’s 2015 Annual Report for a detailed discussion of the accounting treatment for derivative instruments, including embedded derivatives. Derivative instruments are carried at fair value and generally require an insignificant amount of cash at inception of the contracts. Fair Value Hedges The Company designates and reports certain foreign currency swaps to hedge the foreign currency fair value exposure of foreign currency denominated assets as fair value hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging . The gain or loss on the hedged item attributable to a change in foreign currency and the offsetting gain or loss on the related foreign currency swaps as of September 30, 2016 , were (dollars in thousands): Type of Fair Value Hedge Hedged Item Gains (Losses) Recognized for Derivatives Gains (Losses) Recognized for Hedged Items Ineffectiveness Recognized in Investment Related Gains (Losses), net For the three months ended September 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 3,205 $ (3,205 ) $ — For the nine months ended September 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 5,317 $ (5,317 ) $ — A regression analysis was used, both at inception of the hedge and on an ongoing basis, to determine whether each derivative used in a hedged transaction is highly effective in offsetting changes in the hedged item. For the foreign currency swaps, the change in fair value related to changes in the benchmark interest rate and credit spreads are excluded from the hedge effectiveness. For the three and nine months ended September 30, 2016 , $1.6 million and $(5.4) million , respectively, of the change in the estimated fair value of derivatives, was excluded from hedge effectiveness. For the three and nine months ended September 30, 2015 , $2.1 million of the change in the estimated fair value of derivatives, was excluded from hedge effectiveness. Cash Flow Hedges Certain derivative instruments are designated as cash flow hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging . The Company designates and accounts for the following as cash flow hedges: (i) certain interest rate swaps, in which the cash flows of assets are denominated in different currencies, commonly referred to as cross-currency swaps; (ii) certain interest rate swaps, in which the cash flows of liabilities are variable based on a benchmark rate (LIBOR); and (iii) forward bond purchase commitments. The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Three months ended September 30, 2016 2015 Balance beginning of period $ (41,192 ) $ (23,901 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges 932 (13,199 ) Amounts reclassified to investment related (gains) losses, net (116 ) (179 ) Amounts reclassified to investment income (221 ) 112 Balance end of period $ (40,597 ) $ (37,167 ) Nine months ended September 30, 2016 2015 Balance beginning of period $ (29,397 ) $ (31,591 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges (10,866 ) (4,251 ) Amounts reclassified to investment related (gains) losses, net 53 (834 ) Amounts reclassified to investment income (387 ) (491 ) Balance end of period $ (40,597 ) $ (37,167 ) As of September 30, 2016 , the before-tax deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months are approximately $0.6 million . This expectation is based on the anticipated interest payments on hedged investments in fixed maturity securities that will occur over the next twelve months, at which time the Company will recognize the deferred net gains (losses) as an adjustment to investment income over the term of the investment cash flows. The following table presents the effective portion of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Effective Portion Derivative Type Gain (Loss) Recognized in OCI Gain (Loss) Reclassified into Income from OCI Investment Related Gains (Losses), net Investment Income For the three months ended September 30, 2016: Interest rate swaps $ 932 $ — $ 200 Forward bond purchase commitments — 116 21 Total $ 932 $ 116 $ 221 For the three months ended September 30, 2015: Interest rate swaps $ (13,199 ) $ — $ (60 ) Forward bond purchase commitments — 179 (52 ) Total $ (13,199 ) $ 179 $ (112 ) For the nine months ended September 30, 2016: Interest rate swaps $ (10,866 ) $ — $ 454 Forward bond purchase commitments — (53 ) (67 ) Total $ (10,866 ) $ (53 ) $ 387 For the nine months ended September 30, 2015: Interest rate swaps $ (18,349 ) $ — $ 231 Forward bond purchase commitments 14,098 834 260 Total $ (4,251 ) $ 834 $ 491 All components of each derivative's gain or loss were included in the assessment of hedge effectiveness. For the three and nine months ended September 30, 2016 and 2015 , the ineffective portion of derivatives reported as cash flow hedges was not material to the Company's results of operations. Also, there were no material amounts reclassified into earnings relating to instances in which the Company discontinued cash flow hedge accounting because the forecasted transaction did not occur by the anticipated date or within the additional time period permitted by the authoritative guidance for the accounting for derivatives and hedging. Hedges of Net Investments in Foreign Operations The Company uses foreign currency swaps to hedge a portion of its net investment in certain foreign operations against adverse movements in exchange rates. The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Derivative Gains (Losses) Deferred in AOCI For the three months ended September 30, For the nine months ended September 30, Type of NIFO Hedge (1) (2) 2016 2015 2016 2015 Foreign currency swaps $ 8,341 $ 42,702 $ (23,151 ) $ 79,723 (1) There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented. (2) There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations. The cumulative foreign currency translation gain recorded in AOCI related to these hedges was $148.7 million and $171.9 million at September 30, 2016 and December 31, 2015 , respectively. If a foreign operation was sold or substantially liquidated, the amounts in AOCI would be reclassified to the condensed consolidated statements of income. A pro rata portion would be reclassified upon partial sale of a foreign operation. Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging The Company uses various other derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment. The gain or loss related to the change in fair value for these derivative instruments is recognized in investment related gains (losses), net in the condensed consolidated statements of income, except where otherwise noted. A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s condensed consolidated statements of income for the three and nine months ended September 30, 2016 and 2015 is as follows (dollars in thousands): Gain (Loss) for the three months ended September 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 4,122 $ 42,014 Financial futures Investment related gains (losses), net (11,677 ) 16,654 Foreign currency forwards Investment related gains (losses), net 507 708 CPI swaps Investment related gains (losses), net 76 (250 ) Credit default swaps Investment related gains (losses), net 6,672 (8,407 ) Equity options Investment related gains (losses), net (13,648 ) 15,150 Longevity swaps Other revenues 8,921 2,404 Mortality swaps Other revenues (400 ) (442 ) Subtotal (5,427 ) 67,831 Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 49,078 (46,169 ) Indexed annuity products Interest credited (20,104 ) 50,246 Variable annuity products Investment related gains (losses), net 7,988 (95,372 ) Total non-hedging derivatives $ 31,535 $ (23,464 ) Gain (Loss) for the nine months ended September 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 108,149 $ 29,629 Interest rate options Investment related gains (losses), net — 3,275 Financial futures Investment related gains (losses), net (30,285 ) 7,141 Foreign currency forwards Investment related gains (losses), net 6,584 (946 ) CPI swaps Investment related gains (losses), net (624 ) (153 ) Credit default swaps Investment related gains (losses), net 13,536 (5,936 ) Equity options Investment related gains (losses), net (19,576 ) 4,477 Longevity swaps Other revenues 11,402 6,136 Mortality swaps Other revenues 222 (1,399 ) Subtotal 89,408 42,224 Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 33,795 (71,592 ) Indexed annuity products Interest credited (20,730 ) 28,999 Variable annuity products Investment related gains (losses), net (83,089 ) (69,628 ) Total non-hedging derivatives $ 19,384 $ (69,997 ) Types of Derivatives Used by the Company Interest Rate Swaps Interest rate swaps are used by the Company primarily to reduce market risks from changes in interest rates, to alter interest rate exposure arising from mismatches between assets and liabilities (duration mismatches) and to manage the risk of cash flows of liabilities that are variable based on a benchmark rate (LIBOR). With an interest rate swap, the Company agrees with another party to exchange, at specified intervals, the difference between two rates, which can be either fixed-rate or floating-rate interest amounts, tied to an agreed-upon notional principal amount. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments at each due date. The Company utilizes interest rate swaps in cash flow and non-qualifying hedging relationships. Interest Rate Options Interest rate options, commonly referred to as swaptions, have been used by the Company primarily to hedge living benefit guarantees embedded in certain variable annuity products. A swaption, used to hedge against adverse changes in interest rates, is an option to enter into a swap with a forward starting effective date. The Company pays an upfront premium for the right to exercise this option in the future. Financial Futures Exchange-traded futures are used primarily to economically hedge liabilities embedded in certain variable annuity products. With exchange-traded futures transactions, the Company agrees to purchase or sell a specified number of contracts, the value of which is determined by the relevant indices, and to post variation margin on a daily basis in an amount equal to the difference between the daily estimated fair values of those contracts. The Company enters into exchange-traded futures with regulated futures commission merchants that are members of the exchange. Equity Options Equity index options are used by the Company primarily to hedge minimum guarantees embedded in certain variable annuity products. To hedge against adverse changes in equity indices volatility, the Company buys put options. The contracts are net settled in cash based on differentials in the indices at the time of exercise and the strike price. Equity warrants are also used by the Company to economically hedge the variability in anticipated cash flows for the acquisition of investment securities. Consumer Price Index Swaps Consumer price index (“CPI”) swaps are used by the Company primarily to economically hedge liabilities embedded in certain insurance products where value is directly affected by changes in a designated benchmark consumer price index. With a CPI swap transaction, the Company agrees with another party to exchange the actual amount of inflation realized over a specified period of time for a fixed amount of inflation determined at inception. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments to be made by the counterparty at each due date. Most of these swaps will require a single payment to be made by one counterparty at the maturity date of the swap. Foreign Currency Swaps Foreign currency swaps are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency swap transaction, the Company agrees with another party to exchange, at specified intervals, the difference between one currency and another at a forward exchange rate calculated by reference to an agreed upon principal amount. The principal amount of each currency is exchanged at the termination of the currency swap by each party. The Company uses foreign currency swaps to hedge a portion of its net investment in certain foreign operations and foreign currency securities against adverse movements in exchange rates. The Company also uses foreign currency swaps to hedge its exposure to market risks from changes in currency exchange rates with respect to investments denominated in foreign currencies that the Company either holds or intends to acquire or sell. Foreign Currency Forwards Foreign currency forwards are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency forward transaction, the Company agrees with another party to deliver a specified amount of an identified currency at a specified future date. The price is agreed upon at the time of the contract and payment for such a contract is made in a different currency at the specified future date. Forward Bond Purchase Commitments Forward bond purchase commitments have been used by the Company to hedge against the variability in the anticipated cash flows required to purchase securities. With forward bond purchase commitments, the forward price is agreed upon at the time of the contract and payment for such contract is made at the future specified settlement date of the securities. Credit Default Swaps The Company sells protection under single name credit default swaps and credit default swap index tranches to diversify its credit risk exposure in certain portfolios and, in combination with purchasing securities, to replicate characteristics of similar investments based on the credit quality and term of the credit default swap. Credit default triggers for indexed reference entities and single name reference entities are defined in the contracts. The Company’s maximum exposure to credit loss equals the notional value for credit default swaps. In the event of default of a referencing entity, the Company is typically required to pay the protection holder the full notional value less a recovery amount determined at auction. The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Rating Agency Designation of Referenced Credit Obligations (1) Estimated Fair Value of Credit Default Swaps Maximum Amount of Future Payments under Credit Default Swaps (2) Weighted Average Years to Maturity (3) Estimated Fair Value of Credit Default Swaps Maximum Amount of Future Payments under Credit Default Swaps (2) Weighted Average Years to Maturity (3) AA/AA-/A+/A/A- Single name credit default swaps $ 1,625 $ 145,500 4.0 $ 1,689 $ 152,500 3.9 Credit default swaps referencing indices — — — — — — Subtotal 1,625 145,500 4.0 1,689 152,500 3.9 BBB+/BBB/BBB- Single name credit default swaps 75 339,200 4.0 (5,066 ) 315,200 4.2 Credit default swaps referencing indices 5,165 416,000 5.2 2,274 416,000 5.0 Subtotal 5,240 755,200 4.7 (2,792 ) 731,200 4.6 BB+/BB Single name credit default swaps (56 ) 5,000 2.7 (2,900 ) 10,000 4.1 Credit default swaps referencing indices — — — — — — Subtotal (56 ) 5,000 2.7 (2,900 ) 10,000 4.1 Total $ 6,809 $ 905,700 4.6 $ (4,003 ) $ 893,700 4.5 (1) The rating agency designations are based on ratings from Standard and Poor’s (“S&P”). (2) Assumes the value of the referenced credit obligations is zero. (3) The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts. The Company also purchases credit default swaps to reduce its risk against a drop in bond prices due to credit concerns of certain bond issuers. If a credit event, as defined by the contract, occurs, the Company is able to put the bond back to the counterparty at par. Longevity Swaps The Company enters into longevity swaps in the form of out-of-the-money options, which provide protection against changes in mortality improvement to retirement plans and insurers of such plans. With a longevity swap transaction, the Company agrees with another party to exchange a proportion of a notional value. The proportion is determined by the difference between a predefined benefit, and the realized benefit plus the future expected benefit, calculated by reference to a population index for a fixed premium. Mortality Swaps Mortality swaps are used by the Company to hedge risk from changes in mortality experience associated with its reinsurance of life insurance risk. The Company agrees with another party to exchange, at specified intervals, a proportion of a notional value determined by the difference between a predefined expected and realized claim amount on a designated index of reinsured lives, for a fixed percentage (premium) each term. Synthetic Guaranteed Investment Contracts The Company sells fee-based synthetic guaranteed investment contracts to retirement plans which include investment-only, stable value contracts. The assets are owned by the trustees of such plans, who invest the assets under the terms of investment guidelines to which the Company agrees. The contracts contain a guarantee of a minimum rate of return on participant balances supported by the underlying assets, and a guarantee of liquidity to meet certain participant-initiated plan cash flow requirements. These contracts are reported as derivatives, recorded at fair value and classified as interest rate derivatives. Embedded Derivatives The Company has certain embedded derivatives which are required to be separated from their host contracts and reported as derivatives. Host contracts include reinsurance treaties structured on a modified coinsurance ("modco") or funds withheld basis. Additionally, the Company reinsures equity-indexed annuity and variable annuity contracts with benefits that are considered embedded derivatives, including guaranteed minimum withdrawal benefits, guaranteed minimum accumulation benefits, and guaranteed minimum income benefits. The changes in fair values of embedded derivatives on equity-indexed annuities described below relate to changes in the fair value associated with capital market and other related assumptions. The Company’s utilization of a credit valuation adjustment ("CVA") did not have a material effect on the change in fair value of its embedded derivatives for the three and nine months ended September 30, 2016 and 2015 . The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three and nine months ended September 30, 2016 and 2015 are reflected in the following table (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Embedded derivatives in modco or funds withheld arrangements included in investment related gains $ 49,078 $ (46,169 ) $ 33,795 $ (71,592 ) After the associated amortization of DAC and taxes, the related amounts included in net income 9,653 (11,783 ) 1,683 (18,287 ) Embedded derivatives in variable annuity contracts included in investment related gains 7,988 (95,372 ) (83,089 ) (69,628 ) After the associated amortization of DAC and taxes, the related amounts included in net income 2,595 (116,994 ) (63,415 ) (106,796 ) Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses (20,104 ) 50,246 (20,730 ) 28,999 After the associated amortization of DAC and taxes, the related amounts included in net income (13,397 ) 27,861 (9,979 ) 13,095 Credit Risk The Company manages its credit risk related to over-the-counter ("OTC") derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master netting agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination. The credit exposure of the Company's OTC derivative transactions is represented by the contracts with a positive fair value (market value) at the reporting date. To reduce credit exposures, the Company seeks to (i) enter into OTC derivative transactions pursuant to master netting agreements that provide for a netting of payments and receipts with a single counterparty, and (ii) enter into agreements that allow the use of credit support annexes, which are bilateral rating-sensitive agreements that require collateral postings at established threshold levels. Certain of the Company's OTC derivatives are cleared derivatives, which are bilateral transactions between the Company and a counterparty where the transactions are cleared through a clearinghouse, such that each derivative counterparty is only exposed to the default of the clearinghouse. These cleared transactions require initial and daily variation margin collateral postings and include certain interest rate swaps and credit default swaps entered into on or after June 10, 2013, related to guidelines implemented under the Dodd-Frank Wall Street Reform and Consumer Protection Act. Also, the Company enters into exchange-traded futures through regulated exchanges and these transactions are settled on a daily basis, thereby reducing credit risk exposure in the event of non-performance by counterparties to such financial instruments. The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that may vary depending on the posting party’s ratings. Additionally, a decline in the Company’s or the counterparty’s credit ratings to specified levels could result in potential settlement of the derivative positions under the Company’s agreements with its counterparties. The Company also has exchange-traded futures, which require the maintenance of a margin account. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties. The Company’s credit exposure related to derivative contracts is generally limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. The Company’s credit exposure to mortality swaps is minimal, as they are fully collateralized by a counterparty. Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts, centrally cleared derivative contracts and margin account for exchange-traded futures, excluding mortality swaps, at September 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Estimated fair value of derivatives in net asset position $ 313,817 $ 248,968 Cash provided as collateral (1) 20,078 12,540 Securities pledged to counterparties as collateral (2) 74,680 47,149 Cash pledged from counterparties as collateral (3) (305,658 ) (245,038 ) Securities pledged from counterparties as collateral (4) (48,024 ) (20,888 ) Initial margin for cleared derivatives (2) (63,056 ) (34,898 ) Net amount after application of master netting agreements and collateral $ (8,163 ) $ 7,833 Margin account related to exchange-traded futures (5) $ 10,101 $ 11,004 (1) Consists of receivable from counterparty, included in other assets. (2) Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities. (3) Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities. (4) Consists of U.S. Treasury and government securities. (5) Included in other assets.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value of Assets and Liabilities Fair Value Measurement General accounting principles for Fair Value Measurements and Disclosures define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. These principles also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and describes three levels of inputs that may be used to measure fair value: Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. The Company’s Level 1 assets include assets and liabilities that are traded in active exchange markets. Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or market standard valuation techniques and assumptions that use significant inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the related assets or liabilities. Prices are determined using valuation methodologies such as discounted cash flow models and other similar techniques that require management’s judgment or estimation in developing inputs that are consistent with those other market participants would use when pricing similar assets and liabilities. Additionally, the Company’s embedded derivatives, all of which are associated with reinsurance treaties and longevity and mortality swaps, are classified in Level 3 since their values include significant unobservable inputs. When inputs used to measure the fair value of an asset or liability fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement in its entirety, except for fair value measurements using net asset value. For example, a Level 3 fair value measurement may include inputs that are observable (Levels 1 and 2) and unobservable (Level 3). Therefore, gains and losses for such assets and liabilities categorized within Level 3 may include changes in fair value that are attributable to both observable inputs (Levels 1 and 2) and unobservable inputs (Level 3). Assets and Liabilities by Hierarchy Level Assets and liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015 are summarized below (dollars in thousands): September 30, 2016: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 20,164,848 $ 302,603 $ 18,606,341 $ 1,255,904 Canadian and Canadian provincial governments 4,140,379 — 3,566,760 573,619 Residential mortgage-backed securities 1,311,692 — 1,120,999 190,693 Asset-backed securities 1,382,574 — 1,158,923 223,651 Commercial mortgage-backed securities 1,475,033 — 1,437,526 37,507 U.S. government and agencies 1,559,536 1,427,369 106,334 25,833 State and political subdivisions 617,849 — 580,086 37,763 Other foreign government supranational and foreign government-sponsored enterprises 2,884,508 326,297 2,544,785 13,426 Total fixed maturity securities – available-for-sale 33,536,419 2,056,269 29,121,754 2,358,396 Funds withheld at interest – embedded derivatives (42,903 ) — — (42,903 ) Cash equivalents 423,457 378,980 44,477 — Short-term investments 92,151 56,017 36,134 — Other invested assets: Non-redeemable preferred stock 52,852 39,735 13,117 — Other equity securities 367,396 367,396 — — Derivatives: Interest rate swaps 161,008 — 161,008 — CPI swaps (447 ) — (447 ) — Credit default swaps 7,429 — 7,429 — Equity options 40,021 — 40,021 — Foreign currency swaps 102,157 — 102,157 — FVO contractholder-directed unit-linked investments 200,208 198,925 1,283 — Other 37 37 — — Total other invested assets 930,661 606,093 324,568 — Other assets - longevity swaps 27,029 — — 27,029 Total $ 34,966,814 $ 3,097,359 $ 29,526,933 $ 2,342,522 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,130,124 $ — $ — $ 1,130,124 Other liabilities: Derivatives: Interest rate swaps 28,012 — 28,012 — Foreign currency forwards 2,560 — 2,560 — Credit default swaps 254 — 254 — Equity options (8,141 ) — (8,141 ) — Foreign currency swaps 695 — 695 — Mortality swaps 2,068 — — 2,068 Total $ 1,155,572 $ — $ 23,380 $ 1,132,192 December 31, 2015: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 17,708,156 $ 269,039 $ 16,212,147 $ 1,226,970 Canadian and Canadian provincial governments 3,576,759 — 3,160,683 416,076 Residential mortgage-backed securities 1,311,477 — 980,828 330,649 Asset-backed securities 1,212,676 — 908,840 303,836 Commercial mortgage-backed securities 1,483,087 — 1,414,524 68,563 U.S. government and agencies 1,381,659 1,227,858 127,536 26,265 State and political subdivisions 511,014 — 472,672 38,342 Other foreign government, supranational and foreign government-sponsored enterprises 2,458,077 260,552 2,183,460 14,065 Total fixed maturity securities – available-for-sale 29,642,905 1,757,449 25,460,690 2,424,766 Funds withheld at interest – embedded derivatives (76,698 ) — — (76,698 ) Cash equivalents 406,521 406,521 — — Short-term investments 530,773 524,946 5,827 — Other invested assets: Non-redeemable preferred stock 87,520 81,809 5,711 — Other equity securities 38,342 38,342 — — Derivatives: Interest rate swaps 71,882 — 71,882 — Foreign currency forwards 20 — 20 — CPI swaps (292 ) — (292 ) — Credit default swaps 2,567 — 2,567 — Equity options 40,644 — 40,644 — Foreign currency swaps 141,357 — 141,357 — FVO contractholder-directed unit-linked investments 197,547 195,317 2,230 — Other 8,170 8,170 — — Total other invested assets 587,757 323,638 264,119 — Other assets - longevity swaps 14,996 — — 14,996 Total $ 31,106,254 $ 3,012,554 $ 25,730,636 $ 2,363,064 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,070,584 $ — $ — $ 1,070,584 Other liabilities: Derivatives: Interest rate swaps 20,989 — 20,989 — Foreign currency forwards 6,744 — 6,744 — Credit default swaps 5,390 — 5,390 — Equity options (6,009 ) — (6,009 ) — Foreign currency swaps (4,908 ) — (4,908 ) — Mortality swaps 2,619 — — 2,619 Total $ 1,095,409 $ — $ 22,206 $ 1,073,203 The Company may utilize information from third parties, such as pricing services and brokers, to assist in determining the fair value for certain assets and liabilities; however, management is ultimately responsible for all fair values presented in the Company’s condensed consolidated financial statements. This includes responsibility for monitoring the fair value process, ensuring objective and reliable valuation practices and pricing of assets and liabilities, and approving changes to valuation methodologies and pricing sources. The selection of the valuation technique(s) to apply considers the definition of an exit price and the nature of the asset or liability being valued and significant expertise and judgment is required. The Company performs initial and ongoing analysis and review of the various techniques utilized in determining fair value to ensure that they are appropriate and consistently applied, and that the various assumptions are reasonable. The Company analyzes and reviews the information and prices received from third parties to ensure that the prices represent a reasonable estimate of the fair value and to monitor controls around pricing, which includes quantitative and qualitative analysis and is overseen by the Company’s investment and accounting personnel. Examples of procedures performed include, but are not limited to, review of pricing trends, comparison of a sample of executed prices of securities sold to the fair value estimates, comparison of fair value estimates to management’s knowledge of the current market, and ongoing confirmation that third party pricing services use, wherever possible, market-based parameters for valuation. In addition, the Company utilizes both internal and external cash flow models to analyze the reasonableness of fair values utilizing credit spread and other market assumptions, where appropriate. As a result of the analysis, if the Company determines there is a more appropriate fair value based upon the available market data, the price received from the third party is adjusted accordingly. The Company also determines if the inputs used in estimated fair values received from pricing services are observable by assessing whether these inputs can be corroborated by observable market data. For assets and liabilities reported at fair value, the Company utilizes, when available, fair values based on quoted prices in active markets that are regularly and readily obtainable. Generally, these are very liquid investments and the valuation does not require management judgment. When quoted prices in active markets are not available, fair value is based on market valuation techniques, market comparable pricing and the income approach. The use of different techniques, assumptions and inputs may have a material effect on the estimated fair values of the Company’s securities holdings. For the periods presented, the application of market standard valuation techniques applied to similar assets and liabilities has been consistent. The methods and assumptions the Company uses to estimate the fair value of assets and liabilities measured at fair value on a recurring basis are summarized below. Fixed Maturity Securities – The fair values of the Company’s publicly-traded fixed maturity securities are generally based on prices obtained from independent pricing services. Prices from pricing services are sourced from multiple vendors, and a vendor hierarchy is maintained by asset type based on historical pricing experience and vendor expertise. The Company generally receives prices from multiple pricing services for each security, but ultimately uses the price from the vendor that is highest in the hierarchy for the respective asset type. To validate reasonableness, prices are periodically reviewed as explained above. Consistent with the fair value hierarchy described above, securities with quotes from pricing services are generally reflected within Level 2, as they are primarily based on observable pricing for similar assets and/or other market observable inputs. If the pricing information received from third party pricing services is not reflective of market activity or other inputs observable in the market, the Company may challenge the price through a formal process with the pricing service. If the Company ultimately concludes that pricing information received from the independent pricing service is not reflective of fair value, non-binding broker quotes are used, if available. If the Company concludes that the values from both pricing services and brokers are not reflective of fair value, an internally developed valuation may be prepared; however, this occurs infrequently. Internally developed valuations or non-binding broker quotes are also used to determine fair value in circumstances where vendor pricing is not available. These valuations may use significant unobservable inputs, which reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset. Observable market data may not be available in certain circumstances, such as market illiquidity and credit events related to the security. Pricing service overrides, internally developed valuations and non-binding broker quotes are generally based on significant unobservable inputs and are reflected as Level 3 in the valuation hierarchy. The inputs used in the valuation of corporate and government securities include, but are not limited to standard market observable inputs which are derived from, or corroborated by, market observable data including market yield curve, duration, call provisions, observable prices and spreads for similar publicly traded or privately traded issues that incorporate the credit quality and industry sector of the issuer. For structured securities, valuation is based primarily on matrix pricing or other similar techniques using standard market inputs including spreads for actively traded securities, spreads off benchmark yields, expected prepayment speeds and volumes, current and forecasted loss severity, rating, weighted average coupon, weighted average maturity, average delinquency rates, geographic region, debt-service coverage ratios and issuance-specific information including, but not limited to: collateral type, payment terms of the underlying assets, payment priority within the tranche, structure of the security, deal performance and vintage of loans. The fair values of private placement securities are primarily determined using a discounted cash flow model. In certain cases these models primarily use observable inputs with a discount rate based upon the average of spread surveys collected from private market intermediaries who are active in both primary and secondary transactions, taking into account, among other factors, the credit quality and industry sector of the issuer and the reduced liquidity associated with private placements. Generally, these securities have been reflected within Level 3. For certain private fixed maturities, the discounted cash flow model may also incorporate significant unobservable inputs, which reflect the Company’s own assumptions about the inputs market participants would use in pricing the security. To the extent management determines that such unobservable inputs are not significant to the price of a security, a Level 2 classification is made. Otherwise, a Level 3 classification is used. Embedded Derivatives – The fair value of embedded derivative liabilities, including those calculated by third parties, are monitored through the use of attribution reports to quantify the effect of underlying sources of fair value change, including capital market inputs based on policyholder account values, interest rates and short-term and long-term implied volatilities, from period to period. Actuarial assumptions are based on experience studies performed internally in combination with available industry information and are reviewed on a periodic basis, at least annually. For embedded derivative liabilities associated with the underlying products in reinsurance treaties, primarily equity-indexed and variable annuity treaties, the Company utilizes a discounted cash flow model, which includes an estimate of future equity option purchases and an adjustment for a CVA. The variable annuity embedded derivative calculations are performed by third parties based on methodology and input assumptions provided by the Company. To validate the reasonableness of the resulting fair value, the Company’s internal actuaries perform reviews and analytical procedures on the results. The capital market inputs to the model, such as equity indexes, short-term equity volatility and interest rates, are generally observable. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description. The fair value of embedded derivatives associated with funds withheld reinsurance treaties is determined based upon a total return swap technique with reference to the fair value of the investments held by the ceding company that support the Company’s funds withheld at interest asset with an adjustment for a CVA. The fair value of the underlying assets is generally based on market observable inputs using industry standard valuation techniques. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description. Credit Valuation Adjustment – The Company uses a structural default risk model to estimate a CVA. The input assumptions are a combination of externally derived and published values (default threshold and uncertainty), market inputs (interest rate, equity price per share, debt per share, equity price volatility) and insurance industry data (Loss Given Default), adjusted for market recoverability. Cash Equivalents and Short-Term Investments – Cash equivalents and short-term investments include money market instruments, commercial paper and other highly liquid debt instruments. Money market instruments are generally valued using unadjusted quoted prices in active markets that are accessible for identical assets and are primarily classified as Level 1. The fair value of certain other cash equivalents and short-term investments, such as floating rate notes and bonds with original maturities less than twelve months, are based upon other market observable data and are typically classified as Level 2. However, certain short-term investments may incorporate significant unobservable inputs resulting in a Level 3 classification. Various time deposits carried as cash equivalents or short-term investments are not measured at estimated fair value and therefore are excluded from the tables presented. Equity Securities – Equity securities consist principally of exchange-traded funds and preferred stock of publicly and privately traded companies. The fair values of publicly traded equity securities are primarily based on quoted market prices in active markets and are classified within Level 1 in the fair value hierarchy. The fair values of preferred equity securities, for which quoted market prices are not readily available, are based on prices obtained from independent pricing services and these securities are generally classified within Level 2 in the fair value hierarchy. Non-binding broker quotes for equity securities are generally based on significant unobservable inputs and are reflected as Level 3 in the fair value hierarchy. FVO Contractholder-Directed Unit-Linked Investments – FVO contractholder-directed investments supporting unit-linked variable annuity type liabilities primarily consist of exchange-traded funds and, to a lesser extent, fixed maturity securities and cash and cash equivalents. The fair values of the exchange-traded securities are primarily based on quoted market prices in active markets and are classified within Level 1 of the hierarchy. The fair value of the fixed maturity contractholder-directed securities is determined on a basis consistent with the methodologies described above for fixed maturity securities and are classified within Level 2 of the hierarchy. Derivative Assets and Derivative Liabilities – All of the derivative instruments utilized by the Company, except for longevity and mortality swaps, are classified within Level 2 on the fair value hierarchy. These derivatives are principally valued using an income approach. Valuations of interest rate contracts are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, and repurchase rates. Valuations of foreign currency contracts, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, currency spot rates, and cross currency basis curves. Valuations of credit contracts are based on present value techniques, which utilize significant inputs that may include the swap yield curve, credit curves, and recovery rates. Valuations of equity market contracts, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, spot equity index levels, and dividend yield curves. Valuations of equity market contracts, option-based, are based on option pricing models, which utilize significant inputs that may include the swap yield curve, spot equity index levels, dividend yield curves, and equity volatility. The Company does not currently have derivatives, except for longevity and mortality swaps, included in Level 3 measurement. Longevity and Mortality Swaps – The Company utilizes a discounted cash flow model to estimate the fair value of longevity and mortality swaps. The fair value of these swaps includes an accrual for premiums payable and receivable. Some inputs to the valuation model are generally observable, such as interest rates and actual population mortality experience. The valuation also requires significant inputs that are generally not observable and, accordingly, the valuation is considered Level 3 in the fair value hierarchy. Level 3 Measurements and Transfers As of September 30, 2016 and December 31, 2015 , the Company classified approximately 7.0% and 8.2% , respectively, of its fixed maturity securities in the Level 3 category. These securities primarily consist of private placement corporate securities and bank loans with inactive trading markets. Additionally, the Company has included asset-backed securities with subprime exposure and mortgage-backed securities with below investment grade ratings in the Level 3 category due to market uncertainty associated with these securities and the Company’s utilization of unobservable information from third parties for the valuation of these securities. The significant unobservable inputs used in the fair value measurement of the Company’s corporate, sovereign, government-backed, and other political subdivision investments are probability of default, liquidity premium and subordination premium. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumptions used for the liquidity premium and subordination premium. For securities with a fair value derived using the market comparable pricing valuation technique, liquidity premium is the only significant unobservable input. The significant unobservable inputs used in the fair value measurement of the Company’s asset and mortgage-backed securities are prepayment rates, probability of default, liquidity premium and loss severity in the event of default. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumption used for the liquidity premium and loss severity and a directionally opposite change in the assumption used for prepayment rates. The actuarial assumptions used in the fair value of embedded derivatives which include assumptions related to lapses, withdrawals, and mortality, are based on experience studies performed by the Company in combination with available industry information and are reviewed on a periodic basis, at least annually. The significant unobservable inputs used in the fair value measurement of embedded derivatives are assumptions associated with policyholder experience and selected capital market assumptions for equity-indexed and variable annuities. The selected capital market assumptions, which include long-term implied volatilities, are projections based on short-term historical information. Changes in interest rates, equity indices, equity volatility, CVA, and actuarial assumptions regarding policyholder experience may result in significant fluctuations in the value of embedded derivatives. Fair value measurements associated with funds withheld reinsurance treaties are generally not materially sensitive to changes in unobservable inputs associated with policyholder experience. The primary drivers of change in these fair values are related to movements of credit spreads, which are generally observable. Increases (decreases) in market credit spreads tend to decrease (increase) the fair value of embedded derivatives. Increases (decreases) in the CVA assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives. Fair value measurements associated with variable annuity treaties are sensitive to both capital markets inputs and policyholder experience inputs. Increases (decreases) in lapse rates tend to decrease (increase) the value of the embedded derivatives associated with variable annuity treaties. Increases (decreases) in the long-term volatility assumption tend to increase (decrease) the fair value of embedded derivatives. Increases (decreases) in the CVA assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives. The actuarial assumptions used in the fair value of longevity and mortality swaps include assumptions related to the level and volatility of mortality. The assumptions are based on studies performed by the Company in combination with available industry information and are reviewed on a periodic basis, at least annually. The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of September 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 Assets: Corporate securities $ 175,706 $ 195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 25,833 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 5,011 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (42,903 ) (76,698 ) Total return swap Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) CVA 0-5% (1%) 0-5% (1%) Crediting rate 2-4% (2%) 2-4% (3%) Longevity swaps 27,029 14,996 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Mortality improvement (10%)-10% (3%) (10%)-10% (3%) Liabilities: Interest sensitive contract liabilities- embedded derivatives- indexed annuities 854,564 878,114 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) Option budget projection 2-4% (2%) 2-4% (3%) Interest sensitive contract liabilities- embedded derivatives- variable annuities 275,560 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (6%) 0-25% (7%) Withdrawal 0-7% (3%) 0-7% (3%) CVA 0-5% (1%) 0-5% (1%) Long-term volatility 0-27% (14%) 0-27% (14%) Mortality swaps 2,068 2,619 Discounted cash flow Mortality 0-100% (1%) 0-100% (1%) The Company recognizes transfers of assets and liabilities into and out of levels within the fair value hierarchy at the beginning of the quarter in which the actual event or change in circumstances that caused the transfer occurs. Assets and liabilities transferred into Level 3 are due to a lack of observable market transactions and price information. Assets and liabilities are transferred out of Level 3 when circumstances change such that significant inputs can be corroborated with market observable data. This may be due to a significant increase in market activity for the asset or liability, a specific event, one or more significant input(s) becoming observable. Transfers out of Level 3 were primarily the result of the Company obtaining observable pricing information or a third party pricing quotation that appropriately reflects the fair value of those assets and liabilities. In addition, certain transfers out of Level 3 were also due to ratings upgrades on mortgage-backed securities that had previously had below investment-grade ratings. Transfers from Level 1 to Level 2 are due to the lack of observable market data when pricing these securities, while transfers from Level 2 to Level 1 are due to an increase in the availability of market observable data in an active market. There were no transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2016 . The following tables present the transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2015 (dollars in thousands): 2015 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Three months ended September 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ 47,199 Nine months ended September 30: Fixed maturity securities - available-for-sale: Corporate securities $ 625 $ 84,195 The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2016 , as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2016 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2016 (dollars in thousands): For the three months ended September 30, 2016: Fixed maturity securities - available-for-sale Corporate securities Canadian and Canadian provincial governments Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies Fair value, beginning of period $ 1,297,382 $ 554,192 $ 165,979 $ 298,816 $ 37,935 $ 26,255 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (567 ) 3,085 (40 ) 173 304 (122 ) Investment related gains (losses), net 17,917 — — — — — Claims & other policy benefits — — — — — — Interest credited — — — — — — Policy acquisition costs and other insurance expenses — — — — — — Included in other comprehensive income (19,635 ) 16,342 2,597 3,410 (94 ) (135 ) Other revenues — — — — — — Purchases (1) 54,492 — 27,548 5,013 — 147 Sales (1) (26,320 ) — — — — — Settlements (1) (44,110 ) — (6,935 ) (18,602 ) (1 ) (312 ) Transfers into Level 3 — — 1,544 28,285 — — Transfers out of Level 3 (23,255 ) — — (93,444 ) (637 ) — Fair value, end of period $ 1,255,904 $ 573,619 $ 190,693 $ 223,651 $ 37,507 $ 25,833 Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ (489 ) $ 3,085 $ (40 ) $ 173 $ 304 $ (122 ) Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the three months ended September 30, 2016 (continued): Fixed maturity securities available-for-sale State Other foreign government, supranational and foreign government-sponsored enterprises Funds withheld at interest- embedded derivatives Other assets - longevity swaps Interest sensitive contract liabilities embedded derivatives Other liabilities - mortality swaps Fair value, beginning of period $ 35,246 $ 13,706 $ (91,981 ) $ 17,781 $ (1,125,380 ) $ (1,997 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses 10 — — — — Investment related gains (losses), net — — 49,078 7,988 — Interest credited — — — — (20,104 ) — Included in other comprehensive income 553 48 — 327 — — Other revenues — — — 8,921 — (400 ) Purchases (1) 1,986 — — (11,853 ) — Sales (1) — — — — — Settlements (1) (32 ) (328 ) — 19,225 329 Transfers into Level 3 — — — — — Transfers out of Level 3 — — — — — Fair value, end of period $ 37,763 $ 13,426 $ (42,903 ) $ 27,029 $ (1,130,124 ) $ (2,068 ) Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ 10 $ — $ — $ — $ — $ — Investment related gains (losses), net — — 49,078 — 3,969 — Other revenues — — — 8,921 — (400 ) Interest credited — — — — (39,329 ) — For the nine months ended September 30, 2016: Fixed maturity securities - available-for-sale Corporate securities Canadian and Canadian provincial governments Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies Fair value, beginning of period $ 1,226,970 $ 4

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2015 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets. Investment income is allocated to the segments based upon average assets and related capital levels deemed appropriate to support the segment business volumes. The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company’s businesses. As a result of the economic capital allocation process, a portion of investment income is attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses. The Company’s reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands). Three months ended September 30, Nine months ended September 30, Revenues: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 1,444,917 $ 1,312,638 $ 4,339,737 $ 3,910,176 Non-Traditional 276,135 87,099 620,117 471,547 Total 1,721,052 1,399,737 4,959,854 4,381,723 Canada: Traditional 280,959 241,438 827,871 776,532 Non-Traditional 12,359 11,040 34,897 34,372 Total 293,318 252,478 862,768 810,904 Europe, Middle East and Africa: Traditional 289,070 284,350 880,346 863,774 Non-Traditional 99,752 69,238 248,485 199,922 Total 388,822 353,588 1,128,831 1,063,696 Asia Pacific: Traditional 427,647 421,970 1,299,417 1,227,159 Non-Traditional 19,037 11,420 56,153 38,066 Total 446,684 433,390 1,355,570 1,265,225 Corporate and Other 50,701 (559 ) 145,190 68,039 Total $ 2,900,577 $ 2,438,634 $ 8,452,213 $ 7,589,587 Three months ended September 30, Nine months ended September 30, Income (loss) before income taxes: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 77,081 $ 55,652 $ 239,609 $ 156,288 Non-Traditional 102,714 36,255 196,672 161,153 Total 179,795 91,907 436,281 317,441 Canada: Traditional 34,275 34,072 97,679 79,535 Non-Traditional 1,160 3,257 3,880 10,482 Total 35,435 37,329 101,559 90,017 Europe, Middle East and Africa: Traditional 8,515 15,910 14,233 35,551 Non-Traditional 43,786 29,234 96,679 80,300 Total 52,301 45,144 110,912 115,851 Asia Pacific: Traditional 19,822 11,276 95,464 68,239 Non-Traditional 7,549 5,412 16,029 14,152 Total 27,371 16,688 111,493 82,391 Corporate and Other (7,302 ) (50,931 ) (11,842 ) (67,648 ) Total $ 287,600 $ 140,137 $ 748,403 $ 538,052 Assets: September 30, 2016 December 31, 2015 U.S. and Latin America: Traditional $ 17,883,476 $ 16,554,509 Non-Traditional 14,094,435 13,405,878 Total 31,977,911 29,960,387 Canada: Traditional 3,820,039 3,604,344 Non-Traditional 84,287 27,543 Total 3,904,326 3,631,887 Europe, Middle East and Africa: Traditional 2,703,577 2,757,593 Non-Traditional 4,127,806 4,162,703 Total 6,831,383 6,920,296 Asia Pacific: Traditional 4,010,298 3,227,530 Non-Traditional 748,822 742,528 Total 4,759,120 3,970,058 Corporate and Other 7,359,758 5,900,524 Total $ 54,832,498 $ 50,383,152

Commitments, Contingencies and

Commitments, Contingencies and Guarantees	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments, Contingencies and Guarantees Commitments Funding of Investments The Company's commitments to fund investments as of September 30, 2016 and December 31, 2015 are presented in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Limited partnerships and real estate joint ventures $ 318,932 $ 263,163 Commercial mortgage loans 143,870 86,325 Bank loans 50,986 48,686 Equity release mortgages 51,671 8,504 Private placements 8,969 — The Company anticipates that the majority of its current commitments will be invested over the next five years; however, these commitments could become due any time at the request of the counterparties. Investments in limited partnerships and real estate joint ventures, and private placements are carried at cost or reported using the equity method and included in other invested assets in the condensed consolidated balance sheets. Bank loans are carried at fair value and included in fixed maturity securities available-for-sale. Equity release mortgages are carried at unpaid principal balances, net of any amortized premium or discount and valuation allowance and included in other invested assets. Contingencies Litigation The Company is subject to litigation in the normal course of its business. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated. Other Contingencies The Company indemnifies its directors and officers as provided in its charters and by-laws. Since this indemnity generally is not subject to limitation with respect to duration or amount, the Company does not believe that it is possible to determine the maximum potential amount due under this indemnity in the future. Guarantees Statutory Reserve Support RGA, through wholly-owned subsidiaries, has committed to provide statutory reserve support to third parties, in exchange for a fee, by funding loans if certain defined events occur. Such statutory reserves are required under the U.S. Valuation of Life Policies Model Regulation (commonly referred to as Regulation XXX for term life insurance policies and Regulation A-XXX for universal life secondary guarantees). The third parties have recourse to RGA should the subsidiary fail to provide the required funding, however, as of September 30, 2016 , the Company does not believe that it will be required to provide any funding under these commitments as the occurrence of the defined events is considered remote. The following table presents the maximum potential obligation for these commitments as of September 30, 2016 (dollars in millions): Commitment Period: September 30, 2016 2023 $ 500.0 2033 950.0 2034 3,000.0 2035 1,314.2 2036 1,432.0 Other Guarantees RGA has issued guarantees to third parties on behalf of its subsidiaries for the payment of amounts due under certain securities borrowing arrangements, financing arrangements and office lease obligations, whereby, if a subsidiary fails to meet an obligation, RGA or one of its other subsidiaries will make a payment to fulfill the obligation. Additionally, in limited circumstances, treaty guarantees are granted to ceding companies in order to provide them additional security, particularly in cases where RGA’s subsidiary is relatively new, unrated, or not of a significant size, relative to the ceding company. Liabilities supported by the treaty guarantees, before consideration for any legally offsetting amounts due from the guaranteed party are reflected on the Company’s condensed consolidated balance sheets in future policy benefits. Potential guaranteed amounts of future payments will vary depending on production levels and underwriting results. Guarantees related to borrowed securities provide additional security to third parties should a subsidiary fail to return the borrowed securities when due. RGA’s guarantees issued as of September 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Treaty guarantees $ 782,812 $ 765,505 Treaty guarantees, net of assets in trust 654,215 634,909 Borrowed securities 267,360 259,540 Financing arrangements 131,431 100,000 Lease obligations 2,792 5,217

Income Tax Income Tax

Income Tax Income Tax	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Tax Provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 35% to pre-tax income as a result of the following for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Tax provision at U.S. statutory rate $ 100,660 $ 49,048 $ 261,941 $ 188,318 Increase (decrease) in income taxes resulting from: Foreign tax rate differing from U.S. tax rate (2,335 ) (96 ) (14,617 ) (5,685 ) Differences in tax bases in foreign jurisdictions (7,078 ) (16,221 ) (21,567 ) (29,822 ) Deferred tax valuation allowance 4,411 10,239 13,698 21,997 Amounts related to tax audit contingencies (3,979 ) (2,580 ) (175 ) (675 ) Corporate rate changes — — — 58 Subpart F 1,779 12,188 3,212 30,074 Foreign tax credits (1,934 ) (1,106 ) (2,655 ) (4,554 ) Return to provision adjustments (1,996 ) 3,747 (2,227 ) (1,774 ) Other, net (647 ) 1,384 (501 ) 1,076 Total provision for income taxes $ 88,881 $ 56,603 $ 237,109 $ 199,013 Effective tax rate 30.9 % 40.4 % 31.7 % 37.0 % The third quarter of 2016 effective tax rate was lower than the U.S. Statutory rate of 35.0% primarily as a result of effectively settling uncertain tax positions during the quarter and adjustments related to the filing of the U.S. Federal Income tax return. The first nine months of 2016 effective tax rate was lower than the U.S. Statutory rate of 35.0% primarily as a result of tax benefits from income in non-U.S. jurisdictions with lower tax rates than the U.S. The third quarter and first nine months effective tax rates were further reduced by differences in tax bases in foreign jurisdictions. The third quarter and first nine months of 2015 effective tax rates were higher than the U.S. Statutory rate of 35.0% primarily as a result of a tax accrual related to the Active Financing Exception business extender provision that the U.S. Congress did not pass prior to the end of the quarter and a loss in Australia which has a lower tax rate than the U.S. The higher rate was partially offset by tax benefits associated with claims experience on certain treaties and income in other jurisdictions with rates lower than the U.S.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The components of net periodic benefit costs for the three and nine months ended September 30, 2016 and 2015 were as follows (dollars in thousands): Pension Benefits Other Benefits Three months ended September 30, Three months ended September 30, 2016 2015 2016 2015 Service cost $ 2,479 $ 2,307 $ 131 $ 1,868 Interest cost 1,168 1,262 408 947 Expected return on plan assets (1,285 ) (1,224 ) — — Amortization of prior service cost 76 82 (467 ) — Amortization of prior actuarial loss 1,040 636 137 1,319 Net periodic benefit cost $ 3,478 $ 3,063 $ 209 $ 4,134 Pension Benefits Other Benefits Nine months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Service cost $ 7,437 $ 6,923 $ 2,162 $ 3,046 Interest cost 3,503 3,788 1,694 1,929 Expected return on plan assets (3,854 ) (3,673 ) — — Amortization of prior service cost 229 245 (467 ) — Amortization of prior actuarial loss 3,121 1,908 1,370 1,849 Net periodic benefit cost $ 10,436 $ 9,191 $ 4,759 $ 6,824 The Company has made $8.0 million in pension contributions during the first nine months of 2016 and expects to make total pension contributions between $8.0 million and $10.0 million in 2016.

Equity Based Compensation

Equity Based Compensation	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Based Compensation	Equity Based Compensation Equity compensation expense was $8.3 million and $5.7 million in the third quarter of 2016 and 2015 , respectively. In the first quarter of 2016, the Company granted 0.3 million stock appreciation rights at $93.53 weighted average exercise price per share and 0.2 million performance contingent units to employees. Additionally, non-employee directors were granted a total of 8,908 shares of common stock. As of September 30, 2016 , 1.6 million share options at a weighted average strike price per share of $56.55 were vested and exercisable, with a remaining weighted average exercise period of 4.7 years. As of September 30, 2016 , the total compensation cost of non-vested awards not yet recognized in the condensed consolidated financial statements was $33.4 million . It is estimated that these costs will vest over a weighted average period of 1.9 years.

Reinsurance

Reinsurance	9 Months Ended
	Sep. 30, 2016
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]
Retrocession Arrangements and Reinsurance Ceded Receivables	Reinsurance The Company generally reports retrocession activity on a gross basis. Amounts paid or deemed to have been paid for reinsurance are reflected in reinsurance ceded receivables. The cost of reinsurance related to long-duration contracts is recognized over the terms of the reinsured policies on a basis consistent with the reporting of those policies. Retrocession reinsurance treaties do not relieve the Company from its obligations to direct writing companies. Failure of retrocessionaires to honor their obligations could result in losses to the Company. Consequently, allowances would be established for amounts deemed uncollectible. At September 30, 2016 and December 31, 2015 , no allowances were deemed necessary. The Company regularly evaluates the financial condition of the insurance companies from which it assumes and to which it cedes reinsurance. Retrocessions are arranged through the Company’s retrocession pools for amounts in excess of the Company’s retention limit. As of September 30, 2016 and December 31, 2015 , all rated retrocession pool participants followed by the A.M. Best Company were rated “A- (excellent)” or better. The Company verifies retrocession pool participants’ ratings on a quarterly basis. For a majority of the retrocessionaires that were not rated, security in the form of letters of credit or trust assets has been posted. In addition, the Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance. In addition to its third party retrocessionaires, various RGA reinsurance subsidiaries retrocede amounts in excess of their retention to affiliated subsidiaries. The following table presents information for the Company's reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Reinsurer A.M. Best Rating Amount % of Total Amount % of Total Reinsurer A A+ $ 242,364 34.9 % $ 199,479 31.3 % Reinsurer B A+ 189,424 27.3 179,522 28.1 Reinsurer C A+ 69,819 10.0 72,836 11.4 Reinsurer D A 37,634 5.4 37,138 5.8 Reinsurer E A++ 34,387 4.9 41,807 6.6 Other reinsurers 121,278 17.5 107,077 16.8 Total $ 694,906 100.0 % $ 637,859 100.0 % Included in the total reinsurance ceded receivables balance were $267.4 million and $233.7 million of claims recoverable, of which $3.5 million and $2.0 million were in excess of 90 days past due, as of September 30, 2016 and December 31, 2015 , respectively.

Financing Activities

Financing Activities	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Financing Activities In June 2016, RGA issued 3.95% Senior Notes due September 15, 2026 with a face amount of $400.0 million and 5.75% Fixed-To-Floating Rate Subordinated Debentures due June 15, 2056 with a face amount of $400.0 million . These securities have been registered with the Securities and Exchange Commission. The net proceeds from these offerings were approximately $791.0 million and will be used in part to repay upon maturity the Company’s $300.0 million 5.625% Senior Notes that mature in March 2017. The remainder will be used for general corporate purposes. Capitalized issue costs were approximately $9.0 million .

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2016
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Changes to the general accounting principles are established by the Financial Accounting Standards Board ("FASB") in the form of accounting standards updates to the FASB Accounting Standards Codification™. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements. Adoption of New Accounting Standards Transfers and Servicing In June 2014, the FASB amended the general accounting principles for Transfers and Servicing as it relates to the accounting for repurchase-to-maturity transactions, repurchase financings, and disclosures. This amendment requires entities to account for repurchase-to-maturity transactions as secured borrowings, eliminates guidance on linked repurchase financing transactions, and expands disclosure requirements related to certain transfers of financial assets that are accounted for as sales and certain transfers accounted for as secured borrowings. These amendments are effective for annual years, and interim periods within those years, beginning after December 15, 2014. Certain interim period disclosures for repurchase agreements and securities lending transactions were not required until the second quarter of 2015. The adoption of this amendment did not have an impact on the Company's condensed consolidated financial statements other than the addition of the required disclosures. The Company adopted these amendments and the required disclosures are provided in Note 4 "Investments." Business Combinations In September 2015, the FASB amended the general accounting principles for Business Combinations as it relates to measurement period adjustments. This amendment requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined, including the cumulative effect of the change in provisional amount as if the accounting had been completed at the acquisition date. The adjustments related to previous reporting periods since the acquisition date must be disclosed by income statement line item either on the face of the income statement or in the notes. The Company adopted this amendment during the three months ended September 30, 2015. Accordingly, the Company applied the amendments in this update to the measurement period adjustments made during the three months ended September 30, 2015 with no material effect on previous-period or current-period earnings. Debt Issuance Costs In April 2015, the FASB issued accounting guidance, “Simplifying the Presentation of Debt Issuance Costs” which requires capitalized debt issuance costs related to a recognized debt liability be presented in the statement of financial position as a direct deduction from the carrying amount of that debt. This standard is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted for financial statements not yet issued. The Company elected to adopt this standard as of December 31, 2015, with retrospective application to all balance sheets presented. Fair Value Measurement In May 2015, the FASB issued amended guidance on the disclosures for investments in certain entities that calculate net asset value ("NAV") per share (or its equivalent). The amendments remove the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the NAV per share practical expedient. The amendments also remove the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the NAV per share practical expedient. Rather, those disclosures are limited to investments for which the entity has elected to measure the fair value using that practical expedient. The guidance is effective for fiscal years beginning after December 15, 2015 and for interim periods within those years. Early application is permitted. The Company adopted the guidance for the year ended December 31, 2015 and applied the guidance retrospectively. Adoption of the guidance did not have a material impact on the Company’s condensed consolidated financial statements. Future Adoption of New Accounting Standards Financial Services - Insurance In May 2015, the FASB amended the general accounting principle for Financial Services - Insurance which expanded the breadth of disclosures that an insurance entity must provide about its short-duration insurance contracts. This amendment requires insurance entities to disclose for annual reporting periods information about the liability for unpaid claims and claim adjustment expenses. The amendment also requires insurance entities to disclose information about significant changes in methodologies and assumptions used to calculate the liability for unpaid claims and claim adjustment expenses, including reasons for the change and the effects on the financial statements. In addition, the amendment requires insurance entities to disclose for annual and interim reporting periods a roll-forward of the liability for unpaid claims and claim adjustment expenses. This amendment focuses only on disclosure; it does not change the accounting model for short-duration contracts. The update is effective for annual periods beginning after December 15, 2015, and interim periods within annual periods beginning after December 15, 2016. The new guidance should be applied retrospectively by providing comparative disclosures for each period presented, except for those requirements that apply only to the current period. The adoption of this amendment is not expected to have an impact on the Company's condensed consolidated financial statements other than the addition of the required disclosures. Financial Instruments In January 2016, the FASB amended the general accounting principle for Financial Instruments , effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2017. The amendment revises the accounting related to (1) the classification and measurement of investments in equity securities, (2) the presentation of certain fair value changes for financial liabilities measured at fair value, (3) certain disclosure requirements associated with the fair value of financial instruments. The new guidance should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the date of adoption. The Company is currently evaluating the impact of this amendment on its condensed consolidated financial statements. In June, 2016, the FASB amended the existing impairment guidance of Financial Instruments . The amendment adds to U.S. GAAP an impairment model, known as current expected credit loss ("CECL") model, that is based on expected losses rather than incurred losses. For traditional and other receivables, held-to-maturity debt securities, loans and other instruments entities will be required to use the new forward-looking "expected loss" model that generally will result in earlier recognition of allowance for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses similar to what they do today, except the losses will be recognized as allowances rather than reduction to the amortized cost of the securities. This guidance is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2019, with early adoption permitted. The guidance will be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). The Company is currently evaluating the impact of this amendment on its condensed consolidated financial statements. Leases In February 2016, the FASB issued guidance which will replace most existing lease accounting guidance. The new standard, based on the principle that entities should recognize assets and liabilities arising from leases, does not significantly change the lessees’ recognition, measurement and presentation of expenses and cash flows from the previous accounting standard. Leases are classified as finance or operating. The new standard's primary change is the requirement for entities to recognize a lease liability for payments and a right of use asset representing the right to use the leased asset during the term of operating lease arrangements. Lessees are permitted to make an accounting policy election to not recognize the asset and liability for leases with a term of twelve months or less. Lessors’ accounting is largely unchanged from the previous accounting standard. In addition, the new standard expands the disclosure requirements of lease arrangements. Lessees and lessors will use a modified retrospective transition approach, which includes a number of practical expedients. This guidance is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact of this amendment on its condensed consolidated financial statements. Stock Compensation In March 2016, the FASB updated the general accounting principal for Stock Compensation . This update was issued as part of the FASB’s simplification initiative and affects all entities that issue share-based payment awards to their employees. The amendments in this update cover such areas as the recognition of excess tax benefits and deficiencies, the classification of those excess tax benefits on the statement of cash flows, an accounting policy election for forfeitures, the amount an employer can withhold to cover income taxes and still qualify for equity classification and the classification of those taxes paid on the statement of cash flows. This update is effective for annual and interim periods beginning after December 15, 2016. This guidance will be applied either prospectively, retrospectively or using a modified retrospective transition method, depending on the area covered in this update. Early adoption is permitted. The Company is currently evaluating the impact of this amendment on its condensed consolidated financial statements. Income Taxes In October 2016, the FASB amended the general accounting principal for Income Taxes, effective for annual and interim periods beginning after December 15, 2017. The amendment requires entities to recognize the tax consequences of intercompany asset transfers, except for inventory, at the transaction date. Current U.S. GAAP prohibits entities from recognizing the income tax consequences from intercompany asset transfers. The seller defers any net tax effect, and the buyer is prohibited from recognizing a deferred tax asset on the difference between the newly created tax basis of the asset in its tax jurisdiction and its financial statement carrying amount as reported in the condensed consolidated financial statements. The amendment requires entities to recognize these tax consequences in the period in which the transfer occurred. There will be an immediate effect on earnings if the tax rates in the seller’s and buyer’s tax jurisdictions are different. This amendment will be applied using a modified retrospective transition method with a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the impact of this amendment on its condensed consolidated financial statements.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]	The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Earnings: Net income (numerator for basic and diluted calculations) $ 198,719 $ 83,534 $ 511,294 $ 339,039 Shares: Weighted average outstanding shares (denominator for basic calculation) 64,146 66,205 64,281 66,895 Equivalent shares from outstanding stock options 669 677 663 749 Denominator for diluted calculation 64,815 66,882 64,944 67,644 Earnings per share: Basic $ 3.10 $ 1.26 $ 7.95 $ 5.07 Diluted $ 3.07 $ 1.25 $ 7.87 $ 5.01

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Schedule of Stock by Class [Table Text Block]	The changes in number of common stock shares, issued, held in treasury and outstanding are as follows for the periods indicated: Issued Held In Treasury Outstanding Balance, December 31, 2015 79,137,758 13,933,232 65,204,526 Common stock acquired — 1,356,892 (1,356,892 ) Stock-based compensation (1) — (358,639 ) 358,639 Balance, September 30, 2016 79,137,758 14,931,485 64,206,273 Issued Held In Treasury Outstanding Balance, December 31, 2014 79,137,758 10,364,797 68,772,961 Common stock acquired — 3,573,797 (3,573,797 ) Stock-based compensation (1) — (550,237 ) 550,237 Balance, September 30, 2015 79,137,758 13,388,357 65,749,401 (1) Represents net shares issued from treasury pursuant to the Company's equity-based compensation programs.
Components of Accumulated Other Comprehensive Income	The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the nine months ended September 30, 2016 and 2015 are as follows (dollars in thousands): AOCI, Net of Income Tax Accumulated Currency Translation Adjustments Unrealized Appreciation (Depreciation) of Investments (1) Pension and Postretirement Benefits Total Balance, December 31, 2015 $ (181,151 ) $ 935,697 $ (46,262 ) $ 708,284 Other comprehensive income (loss) before reclassifications 68,271 2,191,823 (6,079 ) 2,254,015 Amounts reclassified to (from) AOCI — (109,145 ) 4,253 (104,892 ) Deferred income tax benefit (expense) (8,829 ) (636,902 ) 650 (645,081 ) Balance, September 30, 2016 $ (121,709 ) $ 2,381,473 $ (47,438 ) $ 2,212,326 AOCI, Net of Income Tax Accumulated Currency Translation Adjustments Unrealized Appreciation (Depreciation) of Investments (1) Pension and Postretirement Benefits Total Balance, December 31, 2014 $ 81,847 $ 1,624,773 $ (49,491 ) $ 1,657,129 Other comprehensive income (loss) before reclassifications (176,562 ) (843,541 ) 1,254 (1,018,849 ) Amounts reclassified to (from) AOCI — 34,790 4,002 38,792 Deferred income tax benefit (expense) (24,778 ) 255,968 (1,783 ) 229,407 Balance, September 30, 2015 $ (119,493 ) $ 1,071,990 $ (46,018 ) $ 906,479 (1) Includes cash flow hedges of $(40,597) and $(29,397) as of September 30, 2016 and December 31, 2015 , respectively, and $(37,167) and $(31,591) as of September 30, 2015 and December 31, 2014 , respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.
Reclassification Out Of Accumulated Other Comprehensive Income	The following table presents the amounts of AOCI reclassifications for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Amount Reclassified from AOCI Three months ended September 30, Nine months ended September 30, Details about AOCI Components 2016 2015 2016 2015 Affected Line Item in Statements of Income Net unrealized investment gains (losses): Net unrealized gains (losses) on available-for-sale securities $ 72,351 $ (31,506 ) $ 84,250 $ (26,598 ) Investment related gains (losses), net Cash flow hedges - Interest rate swaps 200 (60 ) 454 231 (1) Cash flow hedges - Forward bond purchase commitments 137 127 (120 ) 1,094 (1) Deferred policy acquisition costs attributed to unrealized gains and losses 12,090 (9,543 ) 24,561 (9,517 ) (2) Total 84,778 (40,982 ) 109,145 (34,790 ) Provision for income taxes (27,680 ) 13,948 (32,676 ) 13,410 Net unrealized gains (losses), net of tax $ 57,098 $ (27,034 ) $ 76,469 $ (21,380 ) Amortization of defined benefit plan items: Prior service cost $ 391 $ (82 ) $ 238 $ (245 ) (3) Actuarial gains (losses) (1,177 ) (1,955 ) (4,491 ) (3,757 ) (3) Total (786 ) (2,037 ) (4,253 ) (4,002 ) Provision for income taxes 276 713 1,489 1,401 Amortization of defined benefit plans, net of tax $ (510 ) $ (1,324 ) $ (2,764 ) $ (2,601 ) Total reclassifications for the period $ 56,588 $ (28,358 ) $ 73,705 $ (23,981 ) (1) See Note 5 - "Derivative Instruments" for additional information on cash flow hedges. (2) This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2015 Annual Report for additional details. (3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional detai

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2016
Investments [Abstract]
Available For Sale Securities	The following tables provide information relating to investments in fixed maturity and equity securities by sector as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 18,762,648 $ 1,498,816 $ 96,616 $ 20,164,848 60.2 % $ — Canadian and Canadian provincial governments 2,598,625 1,541,754 — 4,140,379 12.3 — Residential mortgage-backed securities 1,247,677 67,854 3,839 1,311,692 3.9 (300 ) Asset-backed securities 1,388,263 13,706 19,395 1,382,574 4.1 275 Commercial mortgage-backed securities 1,402,249 73,402 618 1,475,033 4.4 (1,609 ) U.S. government and agencies 1,479,295 80,402 161 1,559,536 4.7 — State and political subdivisions 549,669 72,598 4,418 617,849 1.8 — Other foreign government, supranational and foreign government-sponsored enterprises 2,669,470 220,274 5,236 2,884,508 8.6 — Total fixed maturity securities $ 30,097,896 $ 3,568,806 $ 130,283 $ 33,536,419 100.0 % $ (1,634 ) Non-redeemable preferred stock $ 56,944 $ 2,512 $ 6,604 $ 52,852 12.6 % Other equity securities 360,839 7,013 456 367,396 87.4 Total equity securities $ 417,783 $ 9,525 $ 7,060 $ 420,248 100.0 % December 31, 2015: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 17,575,507 $ 599,718 $ 467,069 $ 17,708,156 59.7 % $ — Canadian and Canadian provincial governments 2,469,009 1,110,282 2,532 3,576,759 12.1 — Residential mortgage-backed securities 1,277,998 45,152 11,673 1,311,477 4.4 (300 ) Asset-backed securities 1,219,000 12,052 18,376 1,212,676 4.1 354 Commercial mortgage-backed securities 1,456,848 37,407 11,168 1,483,087 5.0 (1,609 ) U.S. government and agencies 1,423,791 15,586 57,718 1,381,659 4.7 — State and political subdivisions 480,067 40,014 9,067 511,014 1.7 — Other foreign government, supranational and foreign government-sponsored enterprises 2,420,757 78,964 41,644 2,458,077 8.3 — Total fixed maturity securities $ 28,322,977 $ 1,939,175 $ 619,247 $ 29,642,905 100.0 % $ (1,555 ) Non-redeemable preferred stock $ 85,645 $ 7,837 $ 5,962 $ 87,520 69.5 % Other equity securities 40,584 — 2,242 38,342 30.5 Total equity securities $ 126,229 $ 7,837 $ 8,204 $ 125,862 100.0 %
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]	The following table includes fixed maturity securities pledged and received as collateral and assets in trust held to satisfy collateral requirements under certain third-party reinsurance treaties as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities pledged as collateral $ 191,791 $ 201,124 $ 169,678 $ 176,782 Fixed maturity securities received as collateral n/a 320,838 n/a 242,914 Assets in trust held to satisfy collateral requirements 12,258,854 13,525,565 10,535,729 10,928,393
Concentration Risk Disclosure [Text Block]	The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of September 30, 2016 and December 31, 2015 (dollars in thousands). September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities guaranteed or issued by: Canadian province of Ontario $ 843,239 $ 1,254,701 $ 864,444 $ 1,199,080 Canadian province of Quebec 1,021,325 1,877,335 943,484 1,525,903
Investments Classified By Contractual Maturity Date	The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at September 30, 2016 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date. Amortized Cost Estimated Fair Value Available-for-sale: Due in one year or less $ 728,318 $ 733,750 Due after one year through five years 6,519,471 6,847,608 Due after five years through ten years 8,991,047 9,689,531 Due after ten years 9,820,871 12,096,231 Asset and mortgage-backed securities 4,038,189 4,169,299 Total $ 30,097,896 $ 33,536,419
Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block]	The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016: Estimated Amortized Cost Fair Value % of Total Finance $ 6,530,758 $ 6,916,195 34.4 % Industrial 10,241,489 11,028,232 54.6 Utility 1,990,401 2,220,421 11.0 Total $ 18,762,648 $ 20,164,848 100.0 % December 31, 2015: Estimated Amortized Cost Fair Value % of Total Finance $ 5,408,791 $ 5,555,044 31.4 % Industrial 10,211,426 10,129,917 57.2 Utility 1,955,290 2,023,195 11.4 Total $ 17,575,507 $ 17,708,156 100.0 %
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,974 $ 7,284 $ 7,284 $ 7,284 Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period — — (310 ) — Balance, end of period $ 6,974 $ 7,284 $ 6,974 $ 7,284
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures	The following table presents the total gross unrealized losses for the 755 and 2,080 fixed maturity and equity securities as of September 30, 2016 and December 31, 2015 , respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands): September 30, 2016 December 31, 2015 Gross Unrealized Losses % of Total Gross Unrealized Losses % of Total Less than 20% $ 88,034 64.1 % $ 463,109 73.8 % 20% or more for less than six months 12,551 9.1 142,495 22.7 20% or more for six months or greater 36,758 26.8 21,847 3.5 Total $ 137,343 100.0 % $ 627,451 100.0 %
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]	The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 755 and 2,080 fixed maturity and equity securities that have estimated fair values below amortized cost as of September 30, 2016 and December 31, 2015 , respectively (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost. Less than 12 months 12 months or greater Total Gross Gross Gross September 30, 2016: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 775,973 $ 11,522 $ 567,398 $ 29,794 $ 1,343,371 $ 41,316 Residential mortgage-backed securities 85,970 593 107,240 3,236 193,210 3,829 Asset-backed securities 341,260 4,816 314,518 11,488 655,778 16,304 Commercial mortgage-backed securities 51,965 193 22,415 425 74,380 618 U.S. government and agencies 86,499 161 — — 86,499 161 State and political subdivisions 53,229 841 13,141 3,577 66,370 4,418 Other foreign government, supranational and foreign government-sponsored enterprises 131,702 1,077 51,862 2,340 183,564 3,417 Total investment grade securities 1,526,598 19,203 1,076,574 50,860 2,603,172 70,063 Below investment grade securities: Corporate securities 314,962 9,132 168,865 46,168 483,827 55,300 Residential mortgage-backed securities — — 369 10 369 10 Asset-backed securities 5,858 731 14,707 2,360 20,565 3,091 Other foreign government, supranational and foreign government-sponsored enterprises 6,194 22 42,501 1,797 48,695 1,819 Total below investment grade securities 327,014 9,885 226,442 50,335 553,456 60,220 Total fixed maturity securities $ 1,853,612 $ 29,088 $ 1,303,016 $ 101,195 $ 3,156,628 $ 130,283 Non-redeemable preferred stock $ 3,413 $ 96 $ 23,786 $ 6,508 $ 27,199 $ 6,604 Other equity securities 96,635 210 6,806 246 103,441 456 Total equity securities $ 100,048 $ 306 $ 30,592 $ 6,754 $ 130,640 $ 7,060 Less than 12 months 12 months or greater Total Gross Gross Gross December 31, 2015: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 6,388,148 $ 323,961 $ 294,755 $ 40,861 $ 6,682,903 $ 364,822 Canadian and Canadian provincial governments 122,746 2,532 — — 122,746 2,532 Residential mortgage-backed securities 452,297 7,036 82,314 4,057 534,611 11,093 Asset-backed securities 581,701 9,825 199,298 7,100 780,999 16,925 Commercial mortgage-backed securities 514,877 9,806 31,177 997 546,054 10,803 U.S. government and agencies 1,010,387 57,718 — — 1,010,387 57,718 State and political subdivisions 157,837 5,349 13,016 3,718 170,853 9,067 Other foreign government, supranational and foreign government-sponsored enterprises 702,962 18,279 38,379 4,206 741,341 22,485 Total investment grade securities 9,930,955 434,506 658,939 60,939 10,589,894 495,445 Below investment grade securities: Corporate securities 554,688 71,171 114,427 31,076 669,115 102,247 Residential mortgage-backed securities 22,646 282 7,679 298 30,325 580 Asset-backed securities 6,772 201 9,335 1,250 16,107 1,451 Commercial mortgage-backed securities 3,253 248 767 117 4,020 365 Other foreign government, supranational and foreign government-sponsored enterprises 60,668 7,356 31,693 11,803 92,361 19,159 Total below investment grade securities 648,027 79,258 163,901 44,544 811,928 123,802 Total fixed maturity securities $ 10,578,982 $ 513,764 $ 822,840 $ 105,483 $ 11,401,822 $ 619,247 Non-redeemable preferred stock $ 12,331 $ 2,175 $ 12,191 $ 3,787 $ 24,522 $ 5,962 Other equity securities 38,327 2,242 — — 38,327 2,242 Total equity securities $ 50,658 $ 4,417 $ 12,191 $ 3,787 $ 62,849 $ 8,204
Investment Income	Major categories of investment income, net of related expenses, consist of the following (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Fixed maturity securities available-for-sale $ 325,089 $ 298,376 $ 961,096 $ 871,936 Mortgage loans on real estate 39,802 36,547 121,494 108,440 Policy loans 15,391 16,475 47,897 46,763 Funds withheld at interest 104,609 40,382 273,482 239,967 Short-term investments 952 576 2,912 2,085 Other invested assets 21,938 13,696 61,249 48,141 Investment income 507,781 406,052 1,468,130 1,317,332 Investment expense (18,054 ) (16,455 ) (53,471 ) (50,305 ) Investment income, net of related expenses $ 489,727 $ 389,597 $ 1,414,659 $ 1,267,027
Gain Loss On Investments	Investment related gains (losses), net consist of the following (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Fixed maturity and equity securities available for sale: Other-than-temporary impairment losses on fixed maturity securities recognized in earnings $ — $ (23,111 ) $ (34,663 ) $ (29,775 ) Gain on investment activity 46,346 13,792 127,153 53,002 Loss on investment activity (9,054 ) (22,186 ) (43,397 ) (50,257 ) Other impairment losses and change in mortgage loan provision (262 ) (636 ) (2,111 ) (4,661 ) Derivatives and other, net 49,594 (79,205 ) 37,020 (88,250 ) Total investment related gains (losses), net $ 86,624 $ (111,346 ) $ 84,002 $ (119,941 )
Schedule of Repurchase Agreements [Table Text Block]	The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of September 30, 2016 and December 31, 2015 (dollars in thousands). September 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Borrowed securities $ 267,360 $ 288,310 $ 259,540 $ 266,297 Securities lending: Securities loaned 60,375 62,104 — — Securities received n/a 65,000 n/a — Repurchase program/reverse repurchase program: Securities pledged 442,510 475,820 443,435 465,889 Securities received n/a 514,052 n/a 481,197
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]	The following table presents information on the Company's securities lending and repurchase transactions as of September 30, 2016 and December 31, 2015 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table, as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows. September 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Securities lending transactions: Corporate securities $ — $ — $ — $ 62,104 $ 62,104 Total — — — 62,104 62,104 Repurchase transactions: Corporate securities — 3,906 5,239 133,551 142,696 Residential mortgage-backed securities — — — 98,884 98,884 U.S. government and agencies — — 30,011 181,754 211,765 Foreign government — — — 15,941 15,941 Other 6,534 — — — 6,534 Total 6,534 3,906 35,250 430,130 475,820 Total transactions $ 6,534 $ 3,906 $ 35,250 $ 492,234 $ 537,924 Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table $ 579,052 Amounts related to agreements not included in offsetting disclosure $ 41,128 December 31, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase transactions: Corporate securities $ — $ 2,951 $ — $ 147,324 $ 150,275 Residential mortgage-backed securities — — — 97,639 97,639 U.S. government and agencies — — — 199,431 199,431 Foreign government — — — 3,358 3,358 Other 15,186 — — — 15,186 Total transactions $ 15,186 $ 2,951 $ — $ 447,752 $ 465,889 Gross amount of recognized liabilities for repurchase agreement in preceding table $ 481,197 Amounts related to agreements not included in offsetting disclosure $ 15,308
Disclosure Of Real Estate Holdings By Property Type [Table Text Block]	The distribution of mortgage loans by property type, gross of valuation allowances, is as follows as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Property type: Recorded Investment % of Total Recorded % of Total Office building $ 1,173,087 32.4 % $ 980,858 31.3 % Retail 1,116,602 30.9 1,026,018 32.7 Industrial 703,407 19.5 527,485 16.8 Apartment 436,290 12.1 420,014 13.4 Other commercial 185,060 5.1 182,389 5.8 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 %
Mortgage Loans Classified By Contractual Maturity Date [Table Text Block]	The maturities of the mortgage loans, gross of valuation allowances, as of September 30, 2016 and December 31, 2015 are as follows (dollars in thousands): September 30, 2016 December 31, 2015 Recorded Investment % of Total Recorded Investment % of Total Due within five years $ 793,736 22.0 % $ 873,280 27.8 % Due after five years through ten years 1,952,001 54.0 1,561,535 49.8 Due after ten years 868,709 24.0 701,949 22.4 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 %
Mortgage Loan Internal Credit Risk Grade [Table Text Block]	Information regarding the Company’s credit quality indicators, as determined by the Company's internal evaluation methodology for its recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2016 and December 31, 2015 is as follows (dollars in thousands): September 30, 2016 December 31, 2015 Internal credit quality grade: Recorded Investment % of Total Recorded Investment % of Total High investment grade $ 2,097,202 58.0 % $ 1,621,601 51.7 % Investment grade 1,430,439 39.6 1,397,996 44.6 Average 44,097 1.2 87,196 2.8 Watch list 35,794 1.0 13,550 0.4 In or near default 6,914 0.2 16,421 0.5 Total $ 3,614,446 100.0 % $ 3,136,764 100.0 %
Recorded Investment And Allowance For Credit Losses	The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Mortgage loans: Individually measured for impairment $ 6,913 $ 16,421 Collectively measured for impairment 3,607,533 3,120,343 Mortgage loans, gross of valuation allowances 3,614,446 3,136,764 Valuation allowances: Individually measured for impairment — 588 Collectively measured for impairment 6,746 6,225 Total valuation allowances 6,746 6,813 Mortgage loans, net of valuation allowances $ 3,607,700 $ 3,129,951
Allowance For Mortgage Loan And Lease Losses Provision For Loss Net	Information regarding the Company’s loan valuation allowances for mortgage loans for the three and nine months ended September 30, 2016 and 2015 is as follows (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,499 $ 5,942 $ 6,813 $ 6,471 Provision (release) 247 (290 ) (67 ) (819 ) Balance, end of period $ 6,746 $ 5,652 $ 6,746 $ 5,652
Impaired Financing Receivables Table	Information regarding the portion of the Company’s mortgage loans that were impaired as of September 30, 2016 and December 31, 2015 is as follows (dollars in thousands): Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value September 30, 2016: Impaired mortgage loans with no valuation allowance recorded $ 7,416 $ 6,913 $ — $ 6,913 Impaired mortgage loans with valuation allowance recorded — — — — Total impaired mortgage loans $ 7,416 $ 6,913 $ — $ 6,913 December 31, 2015: Impaired mortgage loans with no valuation allowance recorded $ 4,033 $ 4,033 $ — $ 4,033 Impaired mortgage loans with valuation allowance recorded 12,898 12,388 588 11,800 Total impaired mortgage loans $ 16,931 $ 16,421 $ 588 $ 15,833 The Company’s average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands): Three months ended September 30, 2016 2015 Average (1) Interest Income Average Recorded Investment (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 6,953 $ 107 $ 6,364 $ 71 Impaired mortgage loans with valuation allowance recorded — — 12,495 194 Total impaired mortgage loans $ 6,953 $ 107 $ 18,859 $ 265 Nine months ended September 30, 2016 2015 Average (1) Interest Income Average (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 4,687 $ 324 $ 6,533 $ 212 Impaired mortgage loans with valuation allowance recorded 5,459 — 11,392 578 Total impaired mortgage loans $ 10,146 $ 324 $ 17,925 $ 790 (1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.
Schedule Of Other Invested Assets [Table Text Block]	Carrying values of these assets as of September 30, 2016 and December 31, 2015 are as follows (dollars in thousands): September 30, 2016 December 31, 2015 Equity securities $ 420,248 $ 125,862 Limited partnership interests and real estate joint ventures 671,577 567,697 Derivatives 310,168 256,178 FVO contractholder-directed unit-linked investments 200,208 197,547 Other 174,864 150,836 Total other invested assets $ 1,777,065 $ 1,298,120

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value	The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Notional Carrying Value/Fair Value Notional Carrying Value/Fair Value Amount Assets Liabilities Amount Assets Liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,062,745 $ 175,123 $ 821 $ 1,123,057 $ 85,075 $ 4,196 Financial futures 552,384 — — 420,665 — — Foreign currency forwards 30,000 173 2,733 45,000 44 6,768 Consumer price index swaps 30,043 13 460 28,561 — 292 Credit default swaps 909,000 10,605 3,430 897,000 8,230 11,053 Equity options 610,792 48,162 — 453,435 46,653 — Longevity swaps 898,800 27,029 — 868,960 15,003 7 Mortality swaps 50,000 — 2,068 50,000 — 2,619 Synthetic guaranteed investment contracts 8,726,370 — — 7,098,825 — — Embedded derivatives in: Modified coinsurance or funds withheld arrangements — — 42,903 — — 76,698 Indexed annuity products — — 854,564 — — 878,114 Variable annuity products — — 275,560 — — 192,470 Total non-hedging derivatives 12,870,134 261,105 1,182,539 10,985,503 155,005 1,172,217 Derivatives designated as hedging instruments: Interest rate swaps 435,000 — 41,306 120,000 — 29,986 Foreign currency swaps 937,284 102,667 1,205 823,486 146,265 — Total hedging derivatives 1,372,284 102,667 42,511 943,486 146,265 29,986 Total derivatives $ 14,242,418 $ 363,772 $ 1,225,050 $ 11,928,989 $ 301,270 $ 1,202,203
Offsetting Assets [Table Text Block]	The following table provides information relating to the Company’s derivative instruments as of September 30, 2016 and December 31, 2015 (dollars in thousands): 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) Cash Collateral Pledged/ Received Net Amount September 30, 2016: Derivative assets $ 363,772 $ (26,575 ) $ 337,197 $ (48,024 ) $ (305,658 ) $ (16,485 ) Derivative liabilities 52,023 (26,575 ) 25,448 (74,680 ) (20,078 ) (69,310 ) December 31, 2015: Derivative assets $ 301,270 $ (30,096 ) $ 271,174 $ (20,888 ) $ (245,038 ) $ 5,248 Derivative liabilities 54,921 (30,096 ) 24,825 (47,149 ) (12,540 ) (34,864 )
Offsetting Liabilities [Table Text Block]	The following table provides information relating to the Company’s derivative instruments as of September 30, 2016 and December 31, 2015 (dollars in thousands): 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) Cash Collateral Pledged/ Received Net Amount September 30, 2016: Derivative assets $ 363,772 $ (26,575 ) $ 337,197 $ (48,024 ) $ (305,658 ) $ (16,485 ) Derivative liabilities 52,023 (26,575 ) 25,448 (74,680 ) (20,078 ) (69,310 ) December 31, 2015: Derivative assets $ 301,270 $ (30,096 ) $ 271,174 $ (20,888 ) $ (245,038 ) $ 5,248 Derivative liabilities 54,921 (30,096 ) 24,825 (47,149 ) (12,540 ) (34,864 )
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The gain or loss on the hedged item attributable to a change in foreign currency and the offsetting gain or loss on the related foreign currency swaps as of September 30, 2016 , were (dollars in thousands): Type of Fair Value Hedge Hedged Item Gains (Losses) Recognized for Derivatives Gains (Losses) Recognized for Hedged Items Ineffectiveness Recognized in Investment Related Gains (Losses), net For the three months ended September 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 3,205 $ (3,205 ) $ — For the nine months ended September 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 5,317 $ (5,317 ) $ —
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Three months ended September 30, 2016 2015 Balance beginning of period $ (41,192 ) $ (23,901 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges 932 (13,199 ) Amounts reclassified to investment related (gains) losses, net (116 ) (179 ) Amounts reclassified to investment income (221 ) 112 Balance end of period $ (40,597 ) $ (37,167 ) Nine months ended September 30, 2016 2015 Balance beginning of period $ (29,397 ) $ (31,591 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges (10,866 ) (4,251 ) Amounts reclassified to investment related (gains) losses, net 53 (834 ) Amounts reclassified to investment income (387 ) (491 ) Balance end of period $ (40,597 ) $ (37,167 )
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents the effective portion of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Effective Portion Derivative Type Gain (Loss) Recognized in OCI Gain (Loss) Reclassified into Income from OCI Investment Related Gains (Losses), net Investment Income For the three months ended September 30, 2016: Interest rate swaps $ 932 $ — $ 200 Forward bond purchase commitments — 116 21 Total $ 932 $ 116 $ 221 For the three months ended September 30, 2015: Interest rate swaps $ (13,199 ) $ — $ (60 ) Forward bond purchase commitments — 179 (52 ) Total $ (13,199 ) $ 179 $ (112 ) For the nine months ended September 30, 2016: Interest rate swaps $ (10,866 ) $ — $ 454 Forward bond purchase commitments — (53 ) (67 ) Total $ (10,866 ) $ (53 ) $ 387 For the nine months ended September 30, 2015: Interest rate swaps $ (18,349 ) $ — $ 231 Forward bond purchase commitments 14,098 834 260 Total $ (4,251 ) $ 834 $ 491
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Derivative Gains (Losses) Deferred in AOCI For the three months ended September 30, For the nine months ended September 30, Type of NIFO Hedge (1) (2) 2016 2015 2016 2015 Foreign currency swaps $ 8,341 $ 42,702 $ (23,151 ) $ 79,723 (1) There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented. (2) There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s condensed consolidated statements of income for the three and nine months ended September 30, 2016 and 2015 is as follows (dollars in thousands): Gain (Loss) for the three months ended September 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 4,122 $ 42,014 Financial futures Investment related gains (losses), net (11,677 ) 16,654 Foreign currency forwards Investment related gains (losses), net 507 708 CPI swaps Investment related gains (losses), net 76 (250 ) Credit default swaps Investment related gains (losses), net 6,672 (8,407 ) Equity options Investment related gains (losses), net (13,648 ) 15,150 Longevity swaps Other revenues 8,921 2,404 Mortality swaps Other revenues (400 ) (442 ) Subtotal (5,427 ) 67,831 Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 49,078 (46,169 ) Indexed annuity products Interest credited (20,104 ) 50,246 Variable annuity products Investment related gains (losses), net 7,988 (95,372 ) Total non-hedging derivatives $ 31,535 $ (23,464 ) Gain (Loss) for the nine months ended September 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 108,149 $ 29,629 Interest rate options Investment related gains (losses), net — 3,275 Financial futures Investment related gains (losses), net (30,285 ) 7,141 Foreign currency forwards Investment related gains (losses), net 6,584 (946 ) CPI swaps Investment related gains (losses), net (624 ) (153 ) Credit default swaps Investment related gains (losses), net 13,536 (5,936 ) Equity options Investment related gains (losses), net (19,576 ) 4,477 Longevity swaps Other revenues 11,402 6,136 Mortality swaps Other revenues 222 (1,399 ) Subtotal 89,408 42,224 Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 33,795 (71,592 ) Indexed annuity products Interest credited (20,730 ) 28,999 Variable annuity products Investment related gains (losses), net (83,089 ) (69,628 ) Total non-hedging derivatives $ 19,384 $ (69,997 )
Disclosure Of Credit Derivatives	The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Rating Agency Designation of Referenced Credit Obligations (1) Estimated Fair Value of Credit Default Swaps Maximum Amount of Future Payments under Credit Default Swaps (2) Weighted Average Years to Maturity (3) Estimated Fair Value of Credit Default Swaps Maximum Amount of Future Payments under Credit Default Swaps (2) Weighted Average Years to Maturity (3) AA/AA-/A+/A/A- Single name credit default swaps $ 1,625 $ 145,500 4.0 $ 1,689 $ 152,500 3.9 Credit default swaps referencing indices — — — — — — Subtotal 1,625 145,500 4.0 1,689 152,500 3.9 BBB+/BBB/BBB- Single name credit default swaps 75 339,200 4.0 (5,066 ) 315,200 4.2 Credit default swaps referencing indices 5,165 416,000 5.2 2,274 416,000 5.0 Subtotal 5,240 755,200 4.7 (2,792 ) 731,200 4.6 BB+/BB Single name credit default swaps (56 ) 5,000 2.7 (2,900 ) 10,000 4.1 Credit default swaps referencing indices — — — — — — Subtotal (56 ) 5,000 2.7 (2,900 ) 10,000 4.1 Total $ 6,809 $ 905,700 4.6 $ (4,003 ) $ 893,700 4.5 (1) The rating agency designations are based on ratings from Standard and Poor’s (“S&P”). (2) Assumes the value of the referenced credit obligations is zero. (3) The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.
Changes In Estimated Fair Value Related To Embedded Derivatives	The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three and nine months ended September 30, 2016 and 2015 are reflected in the following table (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Embedded derivatives in modco or funds withheld arrangements included in investment related gains $ 49,078 $ (46,169 ) $ 33,795 $ (71,592 ) After the associated amortization of DAC and taxes, the related amounts included in net income 9,653 (11,783 ) 1,683 (18,287 ) Embedded derivatives in variable annuity contracts included in investment related gains 7,988 (95,372 ) (83,089 ) (69,628 ) After the associated amortization of DAC and taxes, the related amounts included in net income 2,595 (116,994 ) (63,415 ) (106,796 ) Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses (20,104 ) 50,246 (20,730 ) 28,999 After the associated amortization of DAC and taxes, the related amounts included in net income (13,397 ) 27,861 (9,979 ) 13,095
Credit Risk	Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts, centrally cleared derivative contracts and margin account for exchange-traded futures, excluding mortality swaps, at September 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Estimated fair value of derivatives in net asset position $ 313,817 $ 248,968 Cash provided as collateral (1) 20,078 12,540 Securities pledged to counterparties as collateral (2) 74,680 47,149 Cash pledged from counterparties as collateral (3) (305,658 ) (245,038 ) Securities pledged from counterparties as collateral (4) (48,024 ) (20,888 ) Initial margin for cleared derivatives (2) (63,056 ) (34,898 ) Net amount after application of master netting agreements and collateral $ (8,163 ) $ 7,833 Margin account related to exchange-traded futures (5) $ 10,101 $ 11,004 (1) Consists of receivable from counterparty, included in other assets. (2) Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities. (3) Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities. (4) Consists of U.S. Treasury and government securities. (5) Included in other assets.

Fair Value of Assets and Liab26

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Schedule Of Fair Value Assets and Liabilities Measured on Recurring Basis Table Text Block	Assets and liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015 are summarized below (dollars in thousands): September 30, 2016: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 20,164,848 $ 302,603 $ 18,606,341 $ 1,255,904 Canadian and Canadian provincial governments 4,140,379 — 3,566,760 573,619 Residential mortgage-backed securities 1,311,692 — 1,120,999 190,693 Asset-backed securities 1,382,574 — 1,158,923 223,651 Commercial mortgage-backed securities 1,475,033 — 1,437,526 37,507 U.S. government and agencies 1,559,536 1,427,369 106,334 25,833 State and political subdivisions 617,849 — 580,086 37,763 Other foreign government supranational and foreign government-sponsored enterprises 2,884,508 326,297 2,544,785 13,426 Total fixed maturity securities – available-for-sale 33,536,419 2,056,269 29,121,754 2,358,396 Funds withheld at interest – embedded derivatives (42,903 ) — — (42,903 ) Cash equivalents 423,457 378,980 44,477 — Short-term investments 92,151 56,017 36,134 — Other invested assets: Non-redeemable preferred stock 52,852 39,735 13,117 — Other equity securities 367,396 367,396 — — Derivatives: Interest rate swaps 161,008 — 161,008 — CPI swaps (447 ) — (447 ) — Credit default swaps 7,429 — 7,429 — Equity options 40,021 — 40,021 — Foreign currency swaps 102,157 — 102,157 — FVO contractholder-directed unit-linked investments 200,208 198,925 1,283 — Other 37 37 — — Total other invested assets 930,661 606,093 324,568 — Other assets - longevity swaps 27,029 — — 27,029 Total $ 34,966,814 $ 3,097,359 $ 29,526,933 $ 2,342,522 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,130,124 $ — $ — $ 1,130,124 Other liabilities: Derivatives: Interest rate swaps 28,012 — 28,012 — Foreign currency forwards 2,560 — 2,560 — Credit default swaps 254 — 254 — Equity options (8,141 ) — (8,141 ) — Foreign currency swaps 695 — 695 — Mortality swaps 2,068 — — 2,068 Total $ 1,155,572 $ — $ 23,380 $ 1,132,192 December 31, 2015: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 17,708,156 $ 269,039 $ 16,212,147 $ 1,226,970 Canadian and Canadian provincial governments 3,576,759 — 3,160,683 416,076 Residential mortgage-backed securities 1,311,477 — 980,828 330,649 Asset-backed securities 1,212,676 — 908,840 303,836 Commercial mortgage-backed securities 1,483,087 — 1,414,524 68,563 U.S. government and agencies 1,381,659 1,227,858 127,536 26,265 State and political subdivisions 511,014 — 472,672 38,342 Other foreign government, supranational and foreign government-sponsored enterprises 2,458,077 260,552 2,183,460 14,065 Total fixed maturity securities – available-for-sale 29,642,905 1,757,449 25,460,690 2,424,766 Funds withheld at interest – embedded derivatives (76,698 ) — — (76,698 ) Cash equivalents 406,521 406,521 — — Short-term investments 530,773 524,946 5,827 — Other invested assets: Non-redeemable preferred stock 87,520 81,809 5,711 — Other equity securities 38,342 38,342 — — Derivatives: Interest rate swaps 71,882 — 71,882 — Foreign currency forwards 20 — 20 — CPI swaps (292 ) — (292 ) — Credit default swaps 2,567 — 2,567 — Equity options 40,644 — 40,644 — Foreign currency swaps 141,357 — 141,357 — FVO contractholder-directed unit-linked investments 197,547 195,317 2,230 — Other 8,170 8,170 — — Total other invested assets 587,757 323,638 264,119 — Other assets - longevity swaps 14,996 — — 14,996 Total $ 31,106,254 $ 3,012,554 $ 25,730,636 $ 2,363,064 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,070,584 $ — $ — $ 1,070,584 Other liabilities: Derivatives: Interest rate swaps 20,989 — 20,989 — Foreign currency forwards 6,744 — 6,744 — Credit default swaps 5,390 — 5,390 — Equity options (6,009 ) — (6,009 ) — Foreign currency swaps (4,908 ) — (4,908 ) — Mortality swaps 2,619 — — 2,619 Total $ 1,095,409 $ — $ 22,206 $ 1,073,203
Fair Value Unobservable Input Measurements [Table Text Block]	The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of September 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 Assets: Corporate securities $ 175,706 $ 195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 25,833 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 5,011 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (42,903 ) (76,698 ) Total return swap Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) CVA 0-5% (1%) 0-5% (1%) Crediting rate 2-4% (2%) 2-4% (3%) Longevity swaps 27,029 14,996 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Mortality improvement (10%)-10% (3%) (10%)-10% (3%) Liabilities: Interest sensitive contract liabilities- embedded derivatives- indexed annuities 854,564 878,114 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) Option budget projection 2-4% (2%) 2-4% (3%) Interest sensitive contract liabilities- embedded derivatives- variable annuities 275,560 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (6%) 0-25% (7%) Withdrawal 0-7% (3%) 0-7% (3%) CVA 0-5% (1%) 0-5% (1%) Long-term volatility 0-27% (14%) 0-27% (14%) Mortality swaps 2,068 2,619 Discounted cash flow Mortality 0-100% (1%) 0-100% (1%)
Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]	The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of September 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 Assets: Corporate securities $ 175,706 $ 195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 25,833 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 5,011 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (42,903 ) (76,698 ) Total return swap Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) CVA 0-5% (1%) 0-5% (1%) Crediting rate 2-4% (2%) 2-4% (3%) Longevity swaps 27,029 14,996 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Mortality improvement (10%)-10% (3%) (10%)-10% (3%) Liabilities: Interest sensitive contract liabilities- embedded derivatives- indexed annuities 854,564 878,114 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-35% (8%) 0-35% (7%) Withdrawal 0-5% (3%) 0-5% (3%) Option budget projection 2-4% (2%) 2-4% (3%) Interest sensitive contract liabilities- embedded derivatives- variable annuities 275,560 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (6%) 0-25% (7%) Withdrawal 0-7% (3%) 0-7% (3%) CVA 0-5% (1%) 0-5% (1%) Long-term volatility 0-27% (14%) 0-27% (14%) Mortality swaps 2,068 2,619 Discounted cash flow Mortality 0-100% (1%) 0-100% (1%)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Level Transfers [Table Text Block]	The following tables present the transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2015 (dollars in thousands): 2015 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Three months ended September 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ 47,199 Nine months ended September 30: Fixed maturity securities - available-for-sale: Corporate securities $ 625 $ 84,195
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2016 , as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2016 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2016 (dollars in thousands): For the three months ended September 30, 2016: Fixed maturity securities - available-for-sale Corporate securities Canadian and Canadian provincial governments Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies Fair value, beginning of period $ 1,297,382 $ 554,192 $ 165,979 $ 298,816 $ 37,935 $ 26,255 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (567 ) 3,085 (40 ) 173 304 (122 ) Investment related gains (losses), net 17,917 — — — — — Claims & other policy benefits — — — — — — Interest credited — — — — — — Policy acquisition costs and other insurance expenses — — — — — — Included in other comprehensive income (19,635 ) 16,342 2,597 3,410 (94 ) (135 ) Other revenues — — — — — — Purchases (1) 54,492 — 27,548 5,013 — 147 Sales (1) (26,320 ) — — — — — Settlements (1) (44,110 ) — (6,935 ) (18,602 ) (1 ) (312 ) Transfers into Level 3 — — 1,544 28,285 — — Transfers out of Level 3 (23,255 ) — — (93,444 ) (637 ) — Fair value, end of period $ 1,255,904 $ 573,619 $ 190,693 $ 223,651 $ 37,507 $ 25,833 Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ (489 ) $ 3,085 $ (40 ) $ 173 $ 304 $ (122 ) Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the three months ended September 30, 2016 (continued): Fixed maturity securities available-for-sale State Other foreign government, supranational and foreign government-sponsored enterprises Funds withheld at interest- embedded derivatives Other assets - longevity swaps Interest sensitive contract liabilities embedded derivatives Other liabilities - mortality swaps Fair value, beginning of period $ 35,246 $ 13,706 $ (91,981 ) $ 17,781 $ (1,125,380 ) $ (1,997 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses 10 — — — — Investment related gains (losses), net — — 49,078 7,988 — Interest credited — — — — (20,104 ) — Included in other comprehensive income 553 48 — 327 — — Other revenues — — — 8,921 — (400 ) Purchases (1) 1,986 — — (11,853 ) — Sales (1) — — — — — Settlements (1) (32 ) (328 ) — 19,225 329 Transfers into Level 3 — — — — — Transfers out of Level 3 — — — — — Fair value, end of period $ 37,763 $ 13,426 $ (42,903 ) $ 27,029 $ (1,130,124 ) $ (2,068 ) Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ 10 $ — $ — $ — $ — $ — Investment related gains (losses), net — — 49,078 — 3,969 — Other revenues — — — 8,921 — (400 ) Interest credited — — — — (39,329 ) — For the nine months ended September 30, 2016: Fixed maturity securities - available-for-sale Corporate securities Canadian and Canadian provincial governments Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies Fair value, beginning of period $ 1,226,970 $ 416,076 $ 330,649 $ 303,836 $ 68,563 $ 26,265 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (1,986 ) 9,136 (411 ) 599 1,437 (367 ) Investment related gains (losses), net (3,939 ) — (1,922 ) 1,101 (3,289 ) — Interest credited — — — — — — Included in other comprehensive income 36,438 148,407 2,104 (4,324 ) (2,453 ) 922 Other revenues — — — — — — Purchases (1) 195,070 — 99,776 102,063 1,545 404 Sales (1) (36,803 ) — (167,684 ) (38,681 ) (25,976 ) — Settlements (1) (141,065 ) — (31,839 ) (26,523 ) (138 ) (1,391 ) Transfers into Level 3 10,206 — 1,544 53,081 — — Transfers out of Level 3 (28,987 ) — (41,524 ) (167,501 ) (2,182 ) — Fair value, end of period $ 1,255,904 $ 573,619 $ 190,693 $ 223,651 $ 37,507 $ 25,833 Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ (1,917 ) $ 9,136 $ 2 $ 523 $ 1,335 $ (367 ) Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the nine months ended September 30, 2016 (continued): Fixed maturity securities available-for-sale State Other foreign government, supranational and foreign government-sponsored enterprises Funds withheld at interest- embedded derivatives Other assets - longevity swaps Interest sensitive contract liabilities embedded derivatives Other liabilities - mortality swaps Fair value, beginning of period $ 38,342 $ 14,065 $ (76,698 ) $ 14,996 $ (1,070,584 ) $ (2,619 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses 205 — — — — — Investment related gains (losses), net — — 33,795 — (83,089 ) — Interest credited — — — — (20,730 ) — Included in other comprehensive income 1,725 336 — 631 — — Other revenues — — — 11,402 — 222 Purchases (1) 1,986 — — — (9,817 ) — Sales (1) — — — — — — Settlements (1) (290 ) (975 ) — — 54,096 329 Transfers into Level 3 — — — — — — Transfers out of Level 3 (4,205 ) — — — — — Fair value, end of period $ 37,763 $ 13,426 $ (42,903 ) $ 27,029 $ (1,130,124 ) $ (2,068 ) Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ 205 $ — $ — $ — $ — $ — Investment related gains (losses), net — — 33,795 — (92,842 ) — Other revenues — — — 11,402 — 222 Interest credited — — — — (74,826 ) — (1) The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period. The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2015 , as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2015 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2015 (dollars in thousands): For the three months ended September 30, 2015: Fixed maturity securities - available-for-sale Corporate securities Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies State Fair value, beginning of period $ 1,237,317 $ 298,376 $ 580,510 $ 77,819 $ 27,359 $ 40,186 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (891 ) (378 ) 1,609 896 (92 ) 7 Investment related gains (losses), net (35 ) (143 ) 265 (466 ) (37 ) (5 ) Claims & other policy benefits — — — — — — Interest credited — — — — — — Policy acquisition costs and other insurance expenses — — — — — — Included in other comprehensive income (1,125 ) 829 (3,924 ) (1,265 ) 200 (1,164 ) Purchases (1) 66,137 86,748 57,120 — 157 — Sales (1) — (271 ) (174 ) (3,197 ) — — Settlements (1) (47,248 ) (12,263 ) (26,776 ) (1,144 ) (267 ) (30 ) Transfers into Level 3 3,050 453 — — — — Transfers out of Level 3 (9,515 ) (3,684 ) (4,427 ) — — — Fair value, end of period $ 1,247,690 $ 369,667 $ 604,203 $ 72,643 $ 27,320 $ 38,994 Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ (841 ) $ (378 ) $ 373 $ 841 $ (92 ) $ 7 Investment related gains (losses), net — — — — — — Claims & other policy benefits — — — — — — Interest credited — — — — — — For the three months ended September 30, 2015 (continued): Fixed maturity securities available-for-sale Other foreign government, supranational and foreign government-sponsored enterprises Funds withheld at interest- embedded derivatives Other invested assets - non-redeemable preferred stock Other assets longevity swaps Interest sensitive contract liabilities embedded derivatives Other liabilities mortality swaps Fair value, beginning of period $ 14,657 $ (3,329 ) $ 12,388 $ 10,853 $ (1,069,154 ) $ (1,754 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses — — — — — — Investment related gains (losses), net — (46,169 ) — — (95,373 ) — Claims & other policy benefits — — — — — — Interest credited — — — — 50,245 — Policy acquisition costs and other insurance expenses — — — — — — Included in other comprehensive income 273 — (396 ) 41 — — Other revenues — — — 2,404 — (442 ) Purchases (1) — — — — (9,333 ) — Sales (1) — — — — — — Settlements (1) (316 ) — — — 17,205 — Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Fair value, end of period $ 14,614 $ (49,498 ) $ 11,992 $ 13,298 $ (1,106,410 ) $ (2,196 ) Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ — $ — $ — $ — $ — $ — Investment related gains (losses), net — (46,169 ) — — (97,696 ) — Other revenues — — — 2,404 — (442 ) Claims & other policy benefits — — — — — — Interest credited — — — — 33,040 — For the nine months ended September 30, 2015: Fixed maturity securities - available-for-sale Corporate securities Residential mortgage- backed securities Asset-backed securities Commercial mortgage- backed securities U.S. government and agencies State Fair value, beginning of period $ 1,310,427 $ 188,094 $ 572,960 $ 86,746 $ 28,529 $ 42,711 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (2,745 ) (674 ) 4,539 2,167 1 22 Investment related gains (losses), net (606 ) (208 ) 621 (1,149 ) (154 ) (14 ) Claims & other policy benefits — — — — — — Interest credited — — — — — — Policy acquisition costs and other insurance expenses — — — — — — Included in other comprehensive income (11,958 ) 61 (593 ) (1,961 ) (183 ) (2,619 ) Purchases (1) 180,019 217,055 142,292 42 432 — Sales (1) (3,949 ) (985 ) (9,145 ) (6,153 ) — — Settlements (1) (210,544 ) (26,599 ) (94,649 ) (7,157 ) (1,305 ) (271 ) Transfers into Level 3 3,463 2,853 9,055 12,828 — — Transfers out of Level 3 (16,417 ) (9,930 ) (20,877 ) (12,720 ) — (835 ) Fair value, end of period $ 1,247,690 $ 369,667 $ 604,203 $ 72,643 $ 27,320 $ 38,994 Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ (2,641 ) $ (675 ) $ 2,478 $ 2,070 $ 1 $ 22 Investment related gains (losses), net — — — — — — Claims & other policy benefits — — — — — — Interest credited — — — — — — For the nine months ended September 30, 2015 (continued): Fixed maturity securities available-for-sale Other foreign government, supranational and foreign government-sponsored enterprises Funds withheld at interest- embedded derivatives Other invested assets - non-redeemable preferred stock Other assets longevity swaps Interest sensitive contract liabilities embedded derivatives Other liabilities mortality swaps Fair value, beginning of period $ 19,663 $ 22,094 $ 7,904 $ 7,727 $ (1,085,166 ) $ (797 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses — — — — — — Investment related gains (losses), net — (71,592 ) — — (69,628 ) — Claims & other policy benefits — — — — — — Interest credited — — — — — — Policy acquisition costs and other insurance expenses — — — — 28,999 — Included in other comprehensive income 223 — (412 ) (565 ) — — Other revenues — — — 6,136 — (1,399 ) Purchases (1) — — 4,529 — (34,901 ) — Sales (1) — — — — — — Settlements (1) (939 ) — — — 54,286 — Transfers into Level 3 — — — — — — Transfers out of Level 3 (4,333 ) — (29 ) — — — Fair value, end of period $ 14,614 $ (49,498 ) $ 11,992 $ 13,298 $ (1,106,410 ) $ (2,196 ) Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period Included in earnings, net: Investment income, net of related expenses $ — $ — $ — $ — $ — $ — Investment related gains (losses), net — (71,592 ) — — (77,338 ) — Other revenues — — — 6,136 — (1,399 ) Claims & other policy benefits — — — — — — Interest credited — — — — (25,288 ) — (1) The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]	The following table presents information for assets measured at estimated fair value on a nonrecurring basis during the periods presented; they are subject to fair value adjustments only in certain circumstances (for example, when there is evidence of impairment). The estimated fair values for these assets were determined using significant unobservable inputs (Level 3). Carrying Value After Measurement Net Investment Gains (Losses) At September 30, Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2016 2015 2016 2015 2016 2015 Mortgage loans (1) $ 6,913 $ 11,750 $ 747 $ 67 $ 45 $ 106 Limited partnership interests (2) 4,460 12,550 — (924 ) (2,039 ) (5,433 ) (1) Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows. (2) Limited partnership interests — The impaired limited partnership interests presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.
Financial Instruments Carrying Amounts And Estimated Fair Value [Table Text Block]	The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, at September 30, 2016 and December 31, 2015 (dollars in thousands). This table excludes any payables or receivables for collateral under repurchase agreements and other transactions. The estimated fair value of the excluded amount approximates carrying value as they equal the amount of cash collateral received/paid. September 30, 2016: Carrying Value Estimated Fair Value Fair Value Measurement Using: Level 1 Level 2 Level 3 NAV Assets: Mortgage loans on real estate $ 3,607,700 $ 3,787,558 $ — $ — $ 3,787,558 $ — Policy loans 1,414,963 1,414,963 — 1,414,963 — — Funds withheld at interest (1) 5,958,025 6,417,638 — — 6,417,638 — Cash and cash equivalents (2) 956,236 956,236 956,236 — — — Short-term investments (2) 34,551 34,551 34,551 — — — Other invested assets (2) 441,792 470,669 13,932 51,765 119,301 285,671 Accrued investment income 391,837 391,837 — 391,837 — — Liabilities: Interest-sensitive contract liabilities (1) $ 10,258,427 $ 10,711,363 $ — $ — $ 10,711,363 $ — Short-term debt 299,876 305,181 — — 305,181 — Long-term debt 2,788,834 2,986,195 — — 2,986,195 — Collateral finance and securitization notes 847,389 752,494 — — 752,494 — December 31, 2015: Carrying Value Estimated Fair Value Fair Value Measurement Using: Level 1 Level 2 Level 3 NAV Assets: Mortgage loans on real estate $ 3,129,951 $ 3,197,808 $ — $ — $ 3,197,808 $ — Policy loans 1,468,796 1,468,796 — 1,468,796 — — Funds withheld at interest (1) 5,956,380 6,311,780 — — 6,311,780 — Cash and cash equivalents (2) 1,118,754 1,118,754 1,118,754 — — — Short-term investments (2) 27,511 27,511 27,511 — — — Other invested assets (2) 399,799 444,342 4,445 34,886 111,412 293,599 Accrued investment income 339,452 339,452 — 339,452 — — Liabilities: Interest-sensitive contract liabilities (1) $ 9,746,870 $ 9,841,576 $ — $ — $ 9,841,576 $ — Long-term debt 2,297,548 2,415,119 — — 2,415,119 — Collateral finance and securitization notes 899,161 791,275 — — 791,275 — (1) Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis. (2) Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Reconciliation Of Revenue From Segments To Consolidated Text Block	The Company’s reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands). Three months ended September 30, Nine months ended September 30, Revenues: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 1,444,917 $ 1,312,638 $ 4,339,737 $ 3,910,176 Non-Traditional 276,135 87,099 620,117 471,547 Total 1,721,052 1,399,737 4,959,854 4,381,723 Canada: Traditional 280,959 241,438 827,871 776,532 Non-Traditional 12,359 11,040 34,897 34,372 Total 293,318 252,478 862,768 810,904 Europe, Middle East and Africa: Traditional 289,070 284,350 880,346 863,774 Non-Traditional 99,752 69,238 248,485 199,922 Total 388,822 353,588 1,128,831 1,063,696 Asia Pacific: Traditional 427,647 421,970 1,299,417 1,227,159 Non-Traditional 19,037 11,420 56,153 38,066 Total 446,684 433,390 1,355,570 1,265,225 Corporate and Other 50,701 (559 ) 145,190 68,039 Total $ 2,900,577 $ 2,438,634 $ 8,452,213 $ 7,589,587
Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block	Three months ended September 30, Nine months ended September 30, Income (loss) before income taxes: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 77,081 $ 55,652 $ 239,609 $ 156,288 Non-Traditional 102,714 36,255 196,672 161,153 Total 179,795 91,907 436,281 317,441 Canada: Traditional 34,275 34,072 97,679 79,535 Non-Traditional 1,160 3,257 3,880 10,482 Total 35,435 37,329 101,559 90,017 Europe, Middle East and Africa: Traditional 8,515 15,910 14,233 35,551 Non-Traditional 43,786 29,234 96,679 80,300 Total 52,301 45,144 110,912 115,851 Asia Pacific: Traditional 19,822 11,276 95,464 68,239 Non-Traditional 7,549 5,412 16,029 14,152 Total 27,371 16,688 111,493 82,391 Corporate and Other (7,302 ) (50,931 ) (11,842 ) (67,648 ) Total $ 287,600 $ 140,137 $ 748,403 $ 538,052
Reconciliation Of Assets From Segment To Consolidated Text Block	Assets: September 30, 2016 December 31, 2015 U.S. and Latin America: Traditional $ 17,883,476 $ 16,554,509 Non-Traditional 14,094,435 13,405,878 Total 31,977,911 29,960,387 Canada: Traditional 3,820,039 3,604,344 Non-Traditional 84,287 27,543 Total 3,904,326 3,631,887 Europe, Middle East and Africa: Traditional 2,703,577 2,757,593 Non-Traditional 4,127,806 4,162,703 Total 6,831,383 6,920,296 Asia Pacific: Traditional 4,010,298 3,227,530 Non-Traditional 748,822 742,528 Total 4,759,120 3,970,058 Corporate and Other 7,359,758 5,900,524 Total $ 54,832,498 $ 50,383,152

Commitments, Contingencies an28

Commitments, Contingencies and Guarantees (Tables)	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The Company's commitments to fund investments as of September 30, 2016 and December 31, 2015 are presented in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Limited partnerships and real estate joint ventures $ 318,932 $ 263,163 Commercial mortgage loans 143,870 86,325 Bank loans 50,986 48,686 Equity release mortgages 51,671 8,504 Private placements 8,969 —
Other Commitments [Table Text Block]	The following table presents the maximum potential obligation for these commitments as of September 30, 2016 (dollars in millions): Commitment Period: September 30, 2016 2023 $ 500.0 2033 950.0 2034 3,000.0 2035 1,314.2 2036 1,432.0
Schedule of Guarantor Obligations [Table Text Block]	RGA’s guarantees issued as of September 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): September 30, 2016 December 31, 2015 Treaty guarantees $ 782,812 $ 765,505 Treaty guarantees, net of assets in trust 654,215 634,909 Borrowed securities 267,360 259,540 Financing arrangements 131,431 100,000 Lease obligations 2,792 5,217

Income Tax (Tables)

Income Tax (Tables)	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 35% to pre-tax income as a result of the following for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Tax provision at U.S. statutory rate $ 100,660 $ 49,048 $ 261,941 $ 188,318 Increase (decrease) in income taxes resulting from: Foreign tax rate differing from U.S. tax rate (2,335 ) (96 ) (14,617 ) (5,685 ) Differences in tax bases in foreign jurisdictions (7,078 ) (16,221 ) (21,567 ) (29,822 ) Deferred tax valuation allowance 4,411 10,239 13,698 21,997 Amounts related to tax audit contingencies (3,979 ) (2,580 ) (175 ) (675 ) Corporate rate changes — — — 58 Subpart F 1,779 12,188 3,212 30,074 Foreign tax credits (1,934 ) (1,106 ) (2,655 ) (4,554 ) Return to provision adjustments (1,996 ) 3,747 (2,227 ) (1,774 ) Other, net (647 ) 1,384 (501 ) 1,076 Total provision for income taxes $ 88,881 $ 56,603 $ 237,109 $ 199,013 Effective tax rate 30.9 % 40.4 % 31.7 % 37.0 %

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Schedule Of Defined Benefit Plans Disclosures Text Block	The components of net periodic benefit costs for the three and nine months ended September 30, 2016 and 2015 were as follows (dollars in thousands): Pension Benefits Other Benefits Three months ended September 30, Three months ended September 30, 2016 2015 2016 2015 Service cost $ 2,479 $ 2,307 $ 131 $ 1,868 Interest cost 1,168 1,262 408 947 Expected return on plan assets (1,285 ) (1,224 ) — — Amortization of prior service cost 76 82 (467 ) — Amortization of prior actuarial loss 1,040 636 137 1,319 Net periodic benefit cost $ 3,478 $ 3,063 $ 209 $ 4,134 Pension Benefits Other Benefits Nine months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Service cost $ 7,437 $ 6,923 $ 2,162 $ 3,046 Interest cost 3,503 3,788 1,694 1,929 Expected return on plan assets (3,854 ) (3,673 ) — — Amortization of prior service cost 229 245 (467 ) — Amortization of prior actuarial loss 3,121 1,908 1,370 1,849 Net periodic benefit cost $ 10,436 $ 9,191 $ 4,759 $ 6,824

Reinsurance (Tables)

Reinsurance (Tables)	9 Months Ended
	Sep. 30, 2016
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]
Ceded Credit Risk [Table Text Block]	The following table presents information for the Company's reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Reinsurer A.M. Best Rating Amount % of Total Amount % of Total Reinsurer A A+ $ 242,364 34.9 % $ 199,479 31.3 % Reinsurer B A+ 189,424 27.3 179,522 28.1 Reinsurer C A+ 69,819 10.0 72,836 11.4 Reinsurer D A 37,634 5.4 37,138 5.8 Reinsurer E A++ 34,387 4.9 41,807 6.6 Other reinsurers 121,278 17.5 107,077 16.8 Total $ 694,906 100.0 % $ 637,859 100.0 %

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 198,719	$ 83,534	$ 511,294	$ 339,039
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,146	66,205	64,281	66,895
Equivalent shares from outstanding stock options	669	677	663	749
Denominator for diluted calculation	64,815	66,882	64,944	67,644
Earnings Per Share:
Basic earnings per share	$ 3.10	$ 1.26	$ 7.95	$ 5.07
Diluted earnings per share	$ 3.07	$ 1.25	$ 7.87	$ 5.01

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Stock Compensation Plan [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	700	700
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0	0

Equity (Common Stock Changes In

Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758		79,137,758
Treasury Stock, Shares, Acquired		1,400,000
Common Stock Issuable [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758	79,137,758	79,137,758	79,137,758
Treasury Stock, Shares, Acquired		0	0
Stock Based Compensation Shares	[1]	0	0
Common Stock Held In Treasury [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		14,931,485	13,388,357	13,933,232	10,364,797
Treasury Stock, Shares, Acquired		1,356,892	3,573,797
Stock Based Compensation Shares	[1]	(358,639)	(550,237)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,206,273	65,749,401	65,204,526	68,772,961
Treasury Stock, Shares, Acquired		(1,356,892)	(3,573,797)
Stock Based Compensation Shares	[1]	358,639	550,237
[1]	Represents net shares issued from treasury pursuant to the Company's equity-based compensation programs.

Equity (Balance of and Changes

Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income		$ 2,212,326	$ 906,479	$ 708,284	$ 1,657,129
Other Comprehensive Income (Loss), before Reclassifications, before Tax		2,254,015	(1,018,849)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(104,892)	38,792
Other Comprehensive Income (Loss), Tax		645,081	(229,407)
Accumulated Translation Adjustment [Member]
Accumulated other comprehensive income		(121,709)	(119,493)	(181,151)	81,847
Other Comprehensive Income (Loss), before Reclassifications, before Tax		68,271	(176,562)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		(8,829)	(24,778)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income	[1]	2,381,473	1,071,990	935,697	1,624,773
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	2,191,823	(843,541)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(109,145)	34,790
Other Comprehensive Income (Loss), Tax	[1]	636,902	(255,968)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive income		(47,438)	(46,018)	$ (46,262)	$ (49,491)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(6,079)	1,254
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		4,253	4,002
Other Comprehensive Income (Loss), Tax		$ (650)	$ 1,783
[1]	Includes cash flow hedges of $(40,597) and $(29,397) as of September 30, 2016 and December 31, 2015, respectively, and $(37,167) and $(31,591) as of September 30, 2015 and December 31, 2014, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

Equity (Balance of and Change36

Equity (Balance of and Changes in Each Component of AOCI) (Footnote) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (40,597)	$ (41,192)	$ (37,167)	$ (23,901)	$ (40,597)	$ (37,167)	$ (29,397)	$ (31,591)

Equity (Schedule of Reclassific

Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment related gains (losses), net		$ 86,624		$ (88,235)		$ 118,665		$ (90,166)
Investment income		489,727		389,597		1,414,659		1,267,027
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		287,600		140,137		748,403		538,052
Income Tax Expense (Benefit)		(88,881)		(56,603)		(237,109)		(199,013)
Net income		198,719		83,534		511,294		339,039
Unrealized Appreciation Depreciation Of Investments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		84,778		(40,982)		109,145		(34,790)
Income Tax Expense (Benefit)		(27,680)		13,948		(32,676)		13,410
Net income		57,098		(27,034)		76,469		(21,380)
Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment related gains (losses), net		72,351		(31,506)		84,250		(26,598)
Unrealized Appreciation Depreciation Of Investments [Member] | Interest Rate Swap [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	200		(60)		454		231
Unrealized Appreciation Depreciation Of Investments [Member] | Forward Contracts [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	137		127		(120)		1,094
Unrealized Appreciation Depreciation Of Investments [Member] | DAC Attributed To Unrealized Gains Losses [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Deferred policy acquisition costs attributed to unrealized gains and losses		12,090	[1]	(9,543)	[1]	(24,561)	[2]	(9,517)	[2]
Amortization Of Unrealized Pension And Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		(786)		(2,037)		(4,253)		(4,002)
Income Tax Expense (Benefit)		276		713		1,489		1,401
Net income		(510)		(1,324)		(2,764)		(2,601)
Amounts Reclassified From AOCI [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income		56,588		(28,358)		73,705		(23,981)
Prior Service Cost [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Prior service cost		391	[2]	(82)	[2]	238	[3]	(245)	[3]
Actuarial Gains Losses [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Actuarial gains/(losses)		$ (1,177)	[2]	$ (1,955)	[2]	$ 4,491	[3]	$ (3,757)	[3]
[1]	See Note 5 - "Derivative Instruments" for additional information on cash flow hedges.
[2]	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2015 Annual Report for additional details.
[3]	This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

Equity (Narrative) (Details)

Equity (Narrative) (Details) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2016USD ($)shares
Equity [Abstract]
Stock Repurchase Program, Authorized Amount	$ 400
Treasury Stock, Shares, Acquired | shares	1.4
Treasury Stock Value Acquired Cost Method Repurchase Agreement	$ 116.5

Investments (Investments in Fix

Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 18,762,648	$ 17,575,507
Estimated Fair Value	$ 20,164,848	$ 17,708,156
% of Total	100.00%	100.00%
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 30,097,896	$ 28,322,977
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3,568,806	1,939,175
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	130,283	619,247
Estimated Fair Value	$ 33,536,419	$ 29,642,905
% of Total	100.00%	100.00%
Other-than-temporary impairments in AOCI	$ (1,634)	$ (1,555)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	417,783	126,229
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	9,525	7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	7,060	8,204
Estimated Fair Value	$ 420,248	$ 125,862
% of Total	100.00%	100.00%
Corporate Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 18,762,648	$ 17,575,507
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,498,816	599,718
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	96,616	467,069
Estimated Fair Value	$ 20,164,848	$ 17,708,156
% of Total	60.20%	59.70%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Canadian and Canadian provincial governments | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,598,625	2,469,009
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,541,754	1,110,282
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	2,532
Estimated Fair Value	$ 4,140,379	$ 3,576,759
% of Total	12.30%	12.10%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Residential mortgage-backed securities | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,247,677	1,277,998
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	67,854	45,152
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,839	11,673
Estimated Fair Value	$ 1,311,692	$ 1,311,477
% of Total	3.90%	4.40%
Other-than-temporary impairments in AOCI	$ (300)	$ (300)
Asset-backed securities | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,388,263	1,219,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	13,706	12,052
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	19,395	18,376
Estimated Fair Value	$ 1,382,574	$ 1,212,676
% of Total	4.10%	4.10%
Other-than-temporary impairments in AOCI	$ (275)	$ (354)
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,402,249	1,456,848
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	73,402	37,407
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	618	11,168
Estimated Fair Value	$ 1,475,033	$ 1,483,087
% of Total	4.40%	5.00%
Other-than-temporary impairments in AOCI	$ (1,609)	$ (1,609)
US Treasury and Government [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,479,295	1,423,791
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	80,402	15,586
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	161	57,718
Estimated Fair Value	$ 1,559,536	$ 1,381,659
% of Total	4.70%	4.70%
Other-than-temporary impairments in AOCI	$ 0	$ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	549,669	480,067
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	72,598	40,014
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	4,418	9,067
Estimated Fair Value	$ 617,849	$ 511,014
% of Total	1.80%	1.70%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Foreign Government Debt Securities [Member] | Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,669,470	2,420,757
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	220,274	78,964
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,236	41,644
Estimated Fair Value	$ 2,884,508	$ 2,458,077
% of Total	8.60%	8.30%
Other-than-temporary impairments in AOCI	$ 0	$ 0
Nonredeemable Preferred Stock [Member] | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,944	85,645
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,512	7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	6,604	5,962
Estimated Fair Value	$ 52,852	$ 87,520
% of Total	12.60%	69.50%
Other equity securities | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 360,839	$ 40,584
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7,013	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	456	2,242
Estimated Fair Value	$ 367,396	$ 38,342
% of Total	87.40%	30.50%

Investments (Fixed Maturity Sec

Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 18,762,648	$ 17,575,507
Available-for-sale Securities	20,164,848	17,708,156
Collateral Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	191,791	169,678
Available-for-sale Securities	201,124	176,782
Collateral Received Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	320,838	242,914
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	12,258,854	10,535,729
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	$ 13,525,565	$ 10,928,393

Investments (Exposure To Concen

Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 18,762,648	$ 17,575,507
Available-for-sale Securities	20,164,848	17,708,156
Canadian Province Of Quebec Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,021,325	943,484
Available-for-sale Securities	1,877,335	1,525,903
Canadian Province Of Ontario Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	843,239	864,444
Available-for-sale Securities	$ 1,254,701	$ 1,199,080

Investments (Amortized Cost and

Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 728,318
Due after one year through five years	6,519,471
Due after five year through ten years	8,991,047
Due after ten years	9,820,871
Asset and mortgage-backed securities	4,038,189
Total	30,097,896	$ 28,322,977
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	733,750
Due after one year through five years	6,847,608
Due after five year through ten years	9,689,531
Due after ten years	12,096,231
Asset and mortgage-backed securities	4,169,299
Total	$ 33,536,419	$ 29,642,905

Investments (Amortized Cost a43

Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 18,762,648	$ 17,575,507
Estimated Fair Value	$ 20,164,848	$ 17,708,156
% of Total	100.00%	100.00%
Financial Services Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 6,530,758	$ 5,408,791
Estimated Fair Value	$ 6,916,195	$ 5,555,044
% of Total	34.40%	31.40%
Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 10,241,489	$ 10,211,426
Estimated Fair Value	$ 11,028,232	$ 10,129,917
% of Total	54.60%	57.20%
Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 1,990,401	$ 1,955,290
Estimated Fair Value	$ 2,220,421	$ 2,023,195
% of Total	11.00%	11.40%

Investments (Credit Losses Reco

Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	$ 6,974	$ 7,284	$ 7,284	$ 7,284
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	0	(310)	0
Balance, end of period	$ 6,974	$ 7,284	$ 6,974	$ 7,284

Investments (Fair Value Below A

Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 137,343	$ 627,451
% of Total	100.00%	100.00%
Less than 20%
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 88,034	$ 463,109
% of Total	64.10%	73.80%
20% or more for less than six months
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 12,551	$ 142,495
% of Total	9.10%	22.70%
20% or more for six months or greater
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 36,758	$ 21,847
% of Total	26.80%	3.50%

Investments (Fair Value and Los

Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	$ 1,853,612	$ 10,578,982
Gross Unrealized Losses - Less than 12 months	29,088	513,764
Estimated Fair Value - 12 months or greater	1,303,016	822,840
Gross Unrealized Losses - 12 months or greater	101,195	105,483
Estimated Fair Value	3,156,628	11,401,822
Gross Unrealized Losses	130,283	619,247
Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	100,048	50,658
Gross Unrealized Losses - Less than 12 months	306	4,417
Estimated Fair Value - 12 months or greater	30,592	12,191
Gross Unrealized Losses - 12 months or greater	6,754	3,787
Estimated Fair Value	130,640	62,849
Gross Unrealized Losses	7,060	8,204
Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	327,014	648,027
Gross Unrealized Losses - Less than 12 months	9,885	79,258
Estimated Fair Value - 12 months or greater	226,442	163,901
Gross Unrealized Losses - 12 months or greater	50,335	44,544
Estimated Fair Value	553,456	811,928
Gross Unrealized Losses	60,220	123,802
Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	1,526,598	9,930,955
Gross Unrealized Losses - Less than 12 months	19,203	434,506
Estimated Fair Value - 12 months or greater	1,076,574	658,939
Gross Unrealized Losses - 12 months or greater	50,860	60,939
Estimated Fair Value	2,603,172	10,589,894
Gross Unrealized Losses	70,063	495,445
Corporate Debt Securities [Member] | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	314,962	554,688
Gross Unrealized Losses - Less than 12 months	9,132	71,171
Estimated Fair Value - 12 months or greater	168,865	114,427
Gross Unrealized Losses - 12 months or greater	46,168	31,076
Estimated Fair Value	483,827	669,115
Gross Unrealized Losses	55,300	102,247
Corporate Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	775,973	6,388,148
Gross Unrealized Losses - Less than 12 months	11,522	323,961
Estimated Fair Value - 12 months or greater	567,398	294,755
Gross Unrealized Losses - 12 months or greater	29,794	40,861
Estimated Fair Value	1,343,371	6,682,903
Gross Unrealized Losses	41,316	364,822
Canadian and Canadian provincial governments | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		122,746
Gross Unrealized Losses - Less than 12 months		2,532
Estimated Fair Value - 12 months or greater		0
Gross Unrealized Losses - 12 months or greater		0
Estimated Fair Value		122,746
Gross Unrealized Losses		2,532
Residential mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	0	22,646
Gross Unrealized Losses - Less than 12 months	0	282
Estimated Fair Value - 12 months or greater	369	7,679
Gross Unrealized Losses - 12 months or greater	10	298
Estimated Fair Value	369	30,325
Gross Unrealized Losses	10	580
Residential mortgage-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	85,970	452,297
Gross Unrealized Losses - Less than 12 months	593	7,036
Estimated Fair Value - 12 months or greater	107,240	82,314
Gross Unrealized Losses - 12 months or greater	3,236	4,057
Estimated Fair Value	193,210	534,611
Gross Unrealized Losses	3,829	11,093
Asset-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	5,858	6,772
Gross Unrealized Losses - Less than 12 months	731	201
Estimated Fair Value - 12 months or greater	14,707	9,335
Gross Unrealized Losses - 12 months or greater	2,360	1,250
Estimated Fair Value	20,565	16,107
Gross Unrealized Losses	3,091	1,451
Asset-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	341,260	581,701
Gross Unrealized Losses - Less than 12 months	4,816	9,825
Estimated Fair Value - 12 months or greater	314,518	199,298
Gross Unrealized Losses - 12 months or greater	11,488	7,100
Estimated Fair Value	655,778	780,999
Gross Unrealized Losses	16,304	16,925
Commercial mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months		3,253
Gross Unrealized Losses - Less than 12 months		248
Estimated Fair Value - 12 months or greater		767
Gross Unrealized Losses - 12 months or greater		117
Estimated Fair Value		4,020
Gross Unrealized Losses		365
Commercial mortgage-backed securities | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	51,965	514,877
Gross Unrealized Losses - Less than 12 months	193	9,806
Estimated Fair Value - 12 months or greater	22,415	31,177
Gross Unrealized Losses - 12 months or greater	425	997
Estimated Fair Value	74,380	546,054
Gross Unrealized Losses	618	10,803
US Government Agencies Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	86,499	1,010,387
Gross Unrealized Losses - Less than 12 months	161	57,718
Estimated Fair Value - 12 months or greater	0	0
Gross Unrealized Losses - 12 months or greater	0	0
Estimated Fair Value	86,499	1,010,387
Gross Unrealized Losses	161	57,718
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	53,229	157,837
Gross Unrealized Losses - Less than 12 months	841	5,349
Estimated Fair Value - 12 months or greater	13,141	13,016
Gross Unrealized Losses - 12 months or greater	3,577	3,718
Estimated Fair Value	66,370	170,853
Gross Unrealized Losses	4,418	9,067
Foreign Government Debt Securities [Member] | Non-investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	6,194	60,668
Gross Unrealized Losses - Less than 12 months	22	7,356
Estimated Fair Value - 12 months or greater	42,501	31,693
Gross Unrealized Losses - 12 months or greater	1,797	11,803
Estimated Fair Value	48,695	92,361
Gross Unrealized Losses	1,819	19,159
Foreign Government Debt Securities [Member] | Investment grade securities | Fixed maturity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	131,702	702,962
Gross Unrealized Losses - Less than 12 months	1,077	18,279
Estimated Fair Value - 12 months or greater	51,862	38,379
Gross Unrealized Losses - 12 months or greater	2,340	4,206
Estimated Fair Value	183,564	741,341
Gross Unrealized Losses	3,417	22,485
Nonredeemable Preferred Stock [Member] | Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	3,413	12,331
Gross Unrealized Losses - Less than 12 months	96	2,175
Estimated Fair Value - 12 months or greater	23,786	12,191
Gross Unrealized Losses - 12 months or greater	6,508	3,787
Estimated Fair Value	27,199	24,522
Gross Unrealized Losses	6,604	5,962
Other equity securities | Equity securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Estimated Fair Value - Less than 12 months	96,635	38,327
Gross Unrealized Losses - Less than 12 months	210	2,242
Estimated Fair Value - 12 months or greater	6,806	0
Gross Unrealized Losses - 12 months or greater	246	0
Estimated Fair Value	103,441	38,327
Gross Unrealized Losses	$ 456	$ 2,242

Investments (Investment Income

Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 507,781	$ 406,052	$ 1,468,130	$ 1,317,332
Investment expense	(18,054)	(16,455)	(53,471)	(50,305)
Investment income, net of related expenses	489,727	389,597	1,414,659	1,267,027
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	325,089	298,376	961,096	871,936
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	39,802	36,547	121,494	108,440
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	15,391	16,475	47,897	46,763
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	104,609	40,382	273,482	239,967
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	952	576	2,912	2,085
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 21,938	$ 13,696	$ 61,249	$ 48,141

Investments (Investment Related

Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investment Gains And Losses [Abstract]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 0	$ 23,111	$ 34,663	$ 29,775
Gain on investment activity	(46,346)	(13,792)	(127,153)	(53,002)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	(9,054)	(22,186)	(43,397)	(50,257)
Other impairment losses and change in mortgage loan provision	(262)	(636)	(2,111)	(4,661)
Derivatives and other, net	49,594	(79,205)	37,020	(88,250)
Total investment related gains (losses), net	$ 86,624	$ (111,346)	$ 84,002	$ (119,941)

Investments (Borrowed Securitie

Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities Loaned, Fair Value of Collateral	$ 62,104	$ 0
Securities Received as Collateral	65,000	0
Securities for Reverse Repurchase Agreements	442,510	443,435
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	514,052	481,197
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	267,360	259,540
Securities Loaned, Fair Value of Collateral	60,375	0
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	288,310	266,297
Securities for Reverse Repurchase Agreements	$ 475,820	$ 465,889

Investments (Securities Pledged

Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	$ 62,104	$ 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	475,820	465,889
Obligation to Return Securities Received as Collateral	537,924
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	579,052	481,197
SecuredBorrowingsGrossDifferenceAmount	41,128	15,308
Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	62,104
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	142,696	150,275
Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	98,884	97,639
US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	211,765	199,431
Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	15,941	3,358
Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	6,534	15,186
Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	6,534	15,186
Obligation to Return Securities Received as Collateral	6,534
Maturity Overnight [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity Overnight [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	6,534	15,186
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	3,906	2,951
Obligation to Return Securities Received as Collateral	3,906
Maturity up to 30 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	3,906	2,951
Maturity up to 30 days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity up to 30 days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	35,250	0
Obligation to Return Securities Received as Collateral	35,250
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	5,239	0
Maturity 30 to 90 Days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	30,011	0
Maturity 30 to 90 Days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity 30 to 90 Days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	0	0
Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	430,130	447,752
Obligation to Return Securities Received as Collateral	492,234
Maturity over 90 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned, Fair Value of Collateral	62,104
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	133,551	147,324
Maturity over 90 days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	98,884	97,639
Maturity over 90 days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	181,754	199,431
Maturity over 90 days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	15,941	3,358
Maturity over 90 days [Member] | Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	$ 0	$ 0

Investments (Mortgage Loans by

Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 3,614,446	$ 3,136,764
Percentage of total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 436,290	$ 420,014
Percentage of total	12.10%	13.40%
Retail
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 1,116,602	$ 1,026,018
Percentage of total	30.90%	32.70%
Office building
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 1,173,087	$ 980,858
Percentage of total	32.40%	31.30%
Industrial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 703,407	$ 527,485
Percentage of total	19.50%	16.80%
Other commercial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 185,060	$ 182,389
Percentage of total	5.10%	5.80%

Investments (Mortgage Loans b52

Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 3,614,446	$ 3,136,764
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Due within five years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 793,736	$ 873,280
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	22.00%	27.80%
Due after five years through ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,952,001	$ 1,561,535
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	54.00%	49.80%
Due after ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 868,709	$ 701,949
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	24.00%	22.40%

Investments (Mortgage Loans b53

Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 3,614,446	$ 3,136,764
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
High investment grade
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,097,202	$ 1,621,601
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	58.00%	51.70%
Investment grade
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,430,439	$ 1,397,996
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	39.60%	44.60%
Average
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 44,097	$ 87,196
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	1.20%	2.80%
Watch list
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 35,794	$ 13,550
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	1.00%	0.40%
In or near default
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 6,914	$ 16,421
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	0.20%	0.50%

Investments (Mortgage Loans b54

Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Mortgage Loans:
Total mortgage loans	$ 3,614,446	$ 3,136,764
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]
Mortgage loans on real estate (net of valuation allowances)	3,607,700	3,129,951
Commercial Real Estate Portfolio Segment [Member]
Mortgage Loans:
Evaluated individually for credit losses	6,913	16,421
Evaluated collectively for credit losses	3,607,533	3,120,343
Total mortgage loans	3,614,446	3,136,764
Valuation Allowances:
Specific for credit losses	0	588
Non-specifically identified credit losses	6,746	6,225
Total valuation allowances	$ 6,746	$ 6,813

Investments (Loan Valuation All

Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 6,499	$ 5,942	$ 6,813	$ 6,471
Provision (release)	247	(290)	(67)	(819)
Balance, End of Period	$ 6,746	$ 5,652	$ 6,746	$ 5,652

Investments (Impaired Mortgage

Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 7,416		$ 7,416		$ 16,931
Recorded Investment		6,913		6,913		16,421
Related Allowance		0		0		588
Carrying Value		6,913		6,913		15,833
Average Investment	[1]	6,953	$ 18,859	10,146	$ 17,925
Interest Income		107	265	324	790
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0		0		12,898
Recorded Investment		0		0		12,388
Related Allowance		0		0		588
Carrying Value		0		0		11,800
Average Investment	[1]	0	12,495	5,459	11,392
Interest Income		0	194	0	578
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		7,416		7,416		4,033
Recorded Investment		6,913		6,913		4,033
Related Allowance		0		0		0
Carrying Value		6,913		6,913		$ 4,033
Average Investment	[1]	6,953	6,364	4,687	6,533
Interest Income		$ 107	$ 71	$ 324	$ 212
[1]	Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

Investments (Other Invested Ass

Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other invested assets	$ 1,777,065	$ 1,298,120
Equity securities
Other invested assets	420,248	125,862
Limited Partner [Member]
Other invested assets	671,577	567,697
Derivatives
Other invested assets	310,168	256,178
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other invested assets	200,208	197,547
Other
Other invested assets	$ 174,864	$ 150,836

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)securities	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)securities	Sep. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2015USD ($)securities	Jun. 30, 2015USD ($)	Dec. 31, 2014USD ($)
Investment Narrative [Line Items]
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements	$ 3,300		$ 3,300
Proceeds From Sale Of Available For Sale Securities Sold At Loss	317,300	$ 404,100	903,100	$ 1,255,000
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	9,054	22,186	43,397	50,257
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	6,974	7,284	6,974	7,284	$ 6,974	$ 7,284	$ 7,284	$ 7,284
Financing Receivable, Recorded Investment, Past Due	$ 0		$ 0			$ 0
Policy Loans Percent Of Total Investments	3.10%		3.10%			3.50%
Mortgage Loan To Value Ratio on Approval			75.00%
Mortgage Loan Percent Of Cash And Invested Assets	7.80%		7.80%			7.50%
Available-for-sale Securities, Gross Realized Gains	$ 46,346	$ 13,792	$ 127,153	$ 53,002
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities	755		755			2,080
Securities As Percentage Of Consolidated Stockholder Equity	10.00%		10.00%
Securities Borrowed Or Pledged, Minimum Fair Value Percentage			100.00%
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements			100.00%
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%		100.00%			100.00%
Funds Withheld At Interest Percent Of Total Investments	12.80%		12.80%			14.00%
Funds withheld at interest	$ 5,922,656		$ 5,922,656			$ 5,880,203
Funds Held Under Reinsurance Agreements Asset Specific Client	$ 4,000,000		$ 4,000,000
Other Invested Assets Percent Of Cash And Invested Assets	3.80%		3.80%			3.10%
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	23.40%		23.40%			22.30%

Derivative Instruments (Gross N

Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 14,242,418	$ 11,928,989
Carrying Value / Fair Value of Assets	363,772	301,270
Derivative Liability, Fair Value, Gross Liability	1,225,050	1,202,203
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	12,870,134	10,985,503
Carrying Value / Fair Value of Assets	261,105	155,005
Derivative Liability, Fair Value, Gross Liability	1,182,539	1,172,217
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,062,745	1,123,057
Carrying Value / Fair Value of Assets	175,123	85,075
Derivative Liability, Fair Value, Gross Liability	821	4,196
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	552,384	420,665
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	30,000	45,000
Carrying Value / Fair Value of Assets	173	44
Derivative Liability, Fair Value, Gross Liability	2,733	6,768
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	30,043	28,561
Carrying Value / Fair Value of Assets	13	0
Derivative Liability, Fair Value, Gross Liability	460	292
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	909,000	897,000
Carrying Value / Fair Value of Assets	10,605	8,230
Derivative Liability, Fair Value, Gross Liability	3,430	11,053
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	610,792	453,435
Carrying Value / Fair Value of Assets	48,162	46,653
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Longevity Swap [Member]
Derivative [Line Items]
Notional Amount	898,800	868,960
Carrying Value / Fair Value of Assets	27,029	15,003
Derivative Liability, Fair Value, Gross Liability	0	7
Not Designated as Hedging Instrument | Mortality Swap [Member]
Derivative [Line Items]
Notional Amount	50,000	50,000
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	2,068	2,619
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	42,903	76,698
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	854,564	878,114
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	275,560	192,470
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	8,726,370	7,098,825
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	1,372,284	943,486
Carrying Value / Fair Value of Assets	102,667	146,265
Derivative Liability, Fair Value, Gross Liability	42,511	29,986
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	435,000	120,000
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	41,306	29,986
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	937,284	823,486
Carrying Value / Fair Value of Assets	102,667	146,265
Derivative Liability, Fair Value, Gross Liability	$ 1,205	$ 0

Derivative Instruments (Derivat

Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 363,772	$ 301,270
Gross Amounts Offset in the Balance Sheet		(26,575)	(30,096)
Net Amounts Presented in the Balance Sheet		337,197	271,174
Derivative Asset, Fair Value of Collateral	[1]	(48,024)	(20,888)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[2]	(305,658)	(245,038)
Net Amount		(16,485)	5,248
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		52,023	54,921
Gross Amounts Offset in the Balance Sheet		(26,575)	(30,096)
Net Amounts Presented in the Balance Sheet		25,448	24,825
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	[3]	(74,680)	(47,149)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[4]	(20,078)	(12,540)
Net Amount		$ (69,310)	$ (34,864)
[1]	Consists of U.S. Treasury and government securities.
[2]	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3]	Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.
[4]	Consists of receivable from counterparty, included in other assets.

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 3,205	$ 5,317
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(3,205)	(5,317)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	$ 0	$ 0

Derivative Instruments (Current

Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 40,597	$ 41,192	$ 37,167	$ 23,901	$ 40,597	$ 37,167	$ 29,397	$ 31,591
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	932		(13,199)		(10,866)	(4,251)
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(221)		112		(387)	(491)
Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (116)		$ (179)		$ 53	$ (834)

Derivative Instruments (Cash Fl

Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 932		$ (13,199)		$ (10,866)	$ (4,251)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(40,597)	$ (41,192)	(37,167)	$ (23,901)	(40,597)	(37,167)	$ (29,397)	$ (31,591)
Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	116		179		(53)	834
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	221		(112)		387	491
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	932		(13,199)		(10,866)	(18,349)
Interest Rate Swap [Member] | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0		0		0	0
Interest Rate Swap [Member] | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	200		(60)		454	231
Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0		0		0	14,098
Forward Contracts [Member] | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	116		179		(53)	834
Forward Contracts [Member] | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 21		$ (52)		$ (67)	$ 260

Derivative Instruments (Hedges

Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	[1],[2]	$ 8,341	$ 42,702	$ (23,151)	$ 79,723
[1]	There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
[2]	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

Derivative Instruments (Non Hed

Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 86,624	$ (111,346)	$ 84,002	$ (119,941)
Policy acquisition costs and other insurance expenses	(300,962)	(249,702)	(940,406)	(827,157)
Interest credited	(116,848)	(34,008)	(300,602)	(231,932)
Other revenues	72,468	71,038	197,844	200,261
Not Designated as Hedging Instrument
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	31,535	(23,464)	19,384	(69,997)
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	4,122	42,014	108,149	29,629
Not Designated as Hedging Instrument | Interest Rate Options
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net			0	3,275
Not Designated as Hedging Instrument | Financial Futures
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(11,677)	16,654	(30,285)	7,141
Not Designated as Hedging Instrument | Foreign Currency Forwards
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	507	708	6,584	(946)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	76	(250)	(624)	(153)
Not Designated as Hedging Instrument | Credit Default Swaps
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	6,672	(8,407)	13,536	(5,936)
Not Designated as Hedging Instrument | Equity Options
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(13,648)	15,150	(19,576)	4,477
Not Designated as Hedging Instrument | Longevity Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	8,921	2,404	11,402	6,136
Not Designated as Hedging Instrument | Mortality Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	(400)	(442)	222	(1,399)
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	49,078	(46,169)	33,795	(71,592)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Interest credited	20,104	50,246	(20,730)	28,999
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 7,988	$ (95,372)	$ (83,089)	$ (69,628)

Derivative Instruments (Exposur

Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 6,809	$ (4,003)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 905,700	$ 893,700
Derivative Average Remaining Maturity	[1],[3]	4 years 7 months	4 years 6 months
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 1,625	$ 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 145,500	$ 152,500
Derivative Average Remaining Maturity	[1],[3]	4 years	3 years 11 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 0	$ 0
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	0	0
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	1,625	1,689
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 145,500	$ 152,500
Derivative Average Remaining Maturity	[1],[3]	4 years	3 years 11 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 75	$ (5,066)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 339,200	$ 315,200
Derivative Average Remaining Maturity	[1],[3]	4 years	4 years 2 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 5,165	$ 2,274
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 416,000	$ 416,000
Derivative Average Remaining Maturity	[1],[3]	5 years 2 months	5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 5,240	$ (2,792)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 755,200	$ 731,200
Derivative Average Remaining Maturity	[1],[3]	4 years 8 months	4 years 7 months
Standard & Poor's, BB Rating [Member]
Credit Derivatives [Line Items]
Derivative Average Remaining Maturity	[1],[2]	2 years 8 months	4 years 1 month
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (56)	$ (2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	5,000	10,000
Standard & Poor's, BB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	0	0
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	0	0
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	(56)	(2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 5,000	$ 10,000
[1]	The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2]	Assumes the value of the referenced credit obligations is zero.
[3]	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

Derivative Instruments (Changes

Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	$ 86,624	$ (111,346)	$ 84,002	$ (119,941)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	(5,427)	67,831	89,408	42,224
Total benefits and expenses	2,612,977	2,298,497	7,703,810	7,051,535
Net income	198,719	83,534	511,294	339,039
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	49,078	(46,169)	33,795	(71,592)
Net income	9,653	(11,783)	1,683	(18,287)
Embedded Derivatives In Equity Indexed Annuities [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total benefits and expenses	(20,104)	50,246	(20,730)	28,999
Net income	(13,397)	27,861	(9,979)	13,095
Embedded Derivatives In Variable Annuity Contracts [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	7,988	(95,372)	(83,089)	(69,628)
Net income	$ 2,595	$ (116,994)	$ (63,415)	$ (106,796)

Derivative Instruments (Credit

Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Credit Exposure of Derivative Contracts
Estimated fair value of derivatives in net asset (liability) position		$ 313,817	$ 248,968
Derivative, Collateral, Right to Reclaim Cash	[1]	20,078	12,540
Derivative Liability, Fair Value of Collateral	[2]	74,680	47,149
Derivative, Collateral, Obligation to Return Cash	[3]	(305,658)	(245,038)
Derivative Asset, Fair Value of Collateral	[4]	(48,024)	(20,888)
Deposits with Clearing Organizations and Others, Securities	[2]	(63,056)	(34,898)
Net credit exposure		(8,163)	7,833
Margin account related to exchange-traded futures	[5]	$ 10,101	$ 11,004
[1]	Consists of receivable from counterparty, included in other assets.
[2]	Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.
[3]	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[4]	Consists of U.S. Treasury and government securities.
[5]	Included in other assets.

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 1.6		$ (5.4)
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing		$ 2.1
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	0.6		0.6
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	$ 148.7		$ 148.7	$ 171.9

Fair Value of Assets and Liab70

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 33,536,419	$ 29,642,905
Funds withheld at interest embedded derivatives	(42,903)	(76,698)
Cash and cash equivalents	423,457	406,521
Short-term investments	92,151	530,773
Investments, Fair Value Disclosure	930,661	587,757
Other Assets, Fair Value Disclosure	27,029	14,996
Assets, Fair Value Disclosure, Recurring	34,966,814	31,106,254
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	1,130,124	1,070,584
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	1,155,572	1,095,409
Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	52,852	87,520
Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	367,396	38,342
Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	37	8,170
Interest Rate Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	161,008	71,882
Liabilities Fair Value Disclosure
Other liabilities	28,012	20,989
Foreign Currency Forwards
Assets Fair Value Disclosure
Other Assets, Fair Value Disclosure		20
Liabilities Fair Value Disclosure
Other liabilities	2,560	6,744
Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(447)	(292)
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	200,208	197,547
Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	7,429	2,567
Liabilities Fair Value Disclosure
Other liabilities	254	5,390
Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	40,021	40,644
Liabilities Fair Value Disclosure
Other liabilities	(8,141)	(6,009)
Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	102,157	141,357
Liabilities Fair Value Disclosure
Other liabilities	695	(4,908)
Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	2,068	2,619
Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	20,164,848	17,708,156
Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,140,379	3,576,759
Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,311,692	1,311,477
Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,382,574	1,212,676
Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,475,033	1,483,087
US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,559,536	1,381,659
US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	617,849	511,014
Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,884,508	2,458,077
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,056,269	1,757,449
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	378,980	406,521
Short-term investments	56,017	524,946
Investments, Fair Value Disclosure	606,093	323,638
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	3,097,359	3,012,554
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	0	0
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	0	0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	39,735	81,809
Fair Value Inputs Level 1 Member | Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	367,396	38,342
Fair Value Inputs Level 1 Member | Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	37	8,170
Fair Value Inputs Level 1 Member | Interest Rate Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Other Assets, Fair Value Disclosure		0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	198,925	195,317
Fair Value Inputs Level 1 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	302,603	269,039
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,427,369	1,227,858
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	326,297	260,552
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	29,121,754	25,460,690
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	44,477	0
Short-term investments	36,134	5,827
Investments, Fair Value Disclosure	324,568	264,119
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	29,526,933	25,730,636
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	0	0
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	23,380	22,206
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	13,117	5,711
Fair Value Inputs Level 2 Member | Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 2 Member | Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 2 Member | Interest Rate Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	161,008	71,882
Liabilities Fair Value Disclosure
Other liabilities	28,012	20,989
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Other Assets, Fair Value Disclosure		20
Liabilities Fair Value Disclosure
Other liabilities	2,560	6,744
Fair Value Inputs Level 2 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(447)	(292)
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	1,283	2,230
Fair Value Inputs Level 2 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	7,429	2,567
Liabilities Fair Value Disclosure
Other liabilities	254	5,390
Fair Value Inputs Level 2 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	40,021	40,644
Liabilities Fair Value Disclosure
Other liabilities	(8,141)	(6,009)
Fair Value Inputs Level 2 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	102,157	141,357
Liabilities Fair Value Disclosure
Other liabilities	695	(4,908)
Fair Value Inputs Level 2 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	18,606,341	16,212,147
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,566,760	3,160,683
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,120,999	980,828
Fair Value Inputs Level 2 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,158,923	908,840
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,437,526	1,414,524
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	106,334	127,536
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	580,086	472,672
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,544,785	2,183,460
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,358,396	2,424,766
Funds withheld at interest embedded derivatives	(42,903)	(76,698)
Cash and cash equivalents	0	0
Short-term investments	0	0
Investments, Fair Value Disclosure	0	0
Other Assets, Fair Value Disclosure	27,029	14,996
Assets, Fair Value Disclosure, Recurring	2,342,522	2,363,064
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	1,130,124	1,070,584
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	1,132,192	1,073,203
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Interest Rate Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Other Assets, Fair Value Disclosure		0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Fair Value Inputs Level 3 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	0	0
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	2,068	2,619
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,255,904	1,226,970
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	573,619	416,076
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	190,693	330,649
Fair Value Inputs Level 3 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	223,651	303,836
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	37,507	68,563
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	25,833	26,265
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	37,763	38,342
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 13,426	$ 14,065

Fair Value of Assets and Liab71

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Percentage Of Fixed Maturity Securities Classified As Level 3	7.00%	8.20%
Corporate Debt Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 175,706	$ 195,557
Corporate Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
Corporate Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	2.00%	2.00%
Corporate Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	0.00%
Longevity Swap [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 27,029	$ 14,996
Longevity Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Mortality Improvement	3.00%	3.00%
Longevity Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Mortality Improvement	10.00%	10.00%
Longevity Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Mortality Improvement	(10.00%)	(10.00%)
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US Government Agencies Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US Government Agencies Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	0.00%
US States and Political Subdivisions Debt Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 5,011	$ 4,770
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	1.00%
Embedded Derivatives In Indexed Annuity [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 854,564	$ 878,114
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	8.00%	7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Withdrawal	3.00%	3.00%
Fair Value Inputs Option Budget Projection	2.00%	3.00%
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	35.00%	35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	5.00%	5.00%
Fair Value Inputs Option Budget Projection	4.00%	4.00%
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Fair Value Inputs Option Budget Projection	2.00%	2.00%
Embedded Derivatives In Variable Annuity [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 275,560	$ 192,470
Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	6.00%	7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Withdrawal	3.00%	3.00%
Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	25.00%	25.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	7.00%	7.00%
Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	1.00%	1.00%
Fair Value Assumptions, Expected Volatility Rate	14.00%	14.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	5.00%	5.00%
Fair Value Assumptions, Expected Volatility Rate	27.00%	27.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	0.00%	0.00%
Fair Value Assumptions, Expected Volatility Rate	0.00%	0.00%
Mortality Swap [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 2,068	$ 2,619
Mortality Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	1.00%	1.00%
Mortality Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Mortality Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 42,903	$ 76,698
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	8.00%	7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	2.00%	2.00%
Fair Value Inputs Withdrawal	3.00%	3.00%
Fair Value Inputs, Entity Credit Risk	1.00%	1.00%
Fair Value Inputs Credit Rate	2.00%	3.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	35.00%	35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	100.00%	100.00%
Fair Value Inputs Withdrawal	5.00%	5.00%
Fair Value Inputs, Entity Credit Risk	5.00%	5.00%
Fair Value Inputs Credit Rate	4.00%	4.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End	0.00%	0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End	0.00%	0.00%
Fair Value Inputs Withdrawal	0.00%	0.00%
Fair Value Inputs, Entity Credit Risk	0.00%	0.00%
Fair Value Inputs Credit Rate	2.00%	2.00%
Total Return Swap [Member] | US Government Agencies Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 25,833	$ 26,265

Fair Value of Assets and Liab72

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) - Corporate Debt Securities [Member] - Available-for-sale Securities [Member]	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Equity, Level 1 to Level 2 Transfers, Description	0	625
Fair Value, Equity, Level 2 to Level 1 Transfers, Description	47,199	84,195

Fair Value of Assets and Liab73

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, end of period		$ 13,426	$ 14,614	$ 13,426	$ 14,614
Foreign Government Debt Securities [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		(91,981)	(3,329)	(76,698)	22,094
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	0	0	0
Fair Value, end of period		(42,903)	(49,498)	(42,903)	(49,498)
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Funds Withheld At Interest Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		49,078	(46,169)	33,795	(71,592)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		49,078	(46,169)	33,795	(71,592)
Funds Withheld At Interest Embedded Derivatives [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Funds Withheld At Interest Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Funds Withheld At Interest Embedded Derivatives [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Nonredeemable Preferred Stock [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period			12,388		7,904
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(396)		(412)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		0		(4,529)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0		(29)
Fair Value, end of period			11,992		11,992
Nonredeemable Preferred Stock [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Nonredeemable Preferred Stock [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Nonredeemable Preferred Stock [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Nonredeemable Preferred Stock [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Nonredeemable Preferred Stock [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Nonredeemable Preferred Stock [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Longevity Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		17,781	10,853	14,996	7,727
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		327	41	631	(565)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0	0	0
Fair Value, end of period		27,029	13,298	27,029	13,298
Longevity Swap [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Longevity Swap [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Longevity Swap [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Longevity Swap [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Longevity Swap [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Longevity Swap [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		8,921	2,404	11,402	6,136
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		8,921	2,404	11,402	6,136
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		(1,125,380)	(1,069,154)	(1,070,584)	(1,085,166)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	[1]	(11,853)	9,333	(9,817)	34,901
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	[1]	19,225	17,205	54,096	54,286
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3		0	0	0	0
Fair Value, end of period		(1,130,124)	(1,106,410)	(1,130,124)	(1,106,410)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Gain (Loss) on Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		7,988	(95,373)	(83,089)	(69,628)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		3,969	(97,696)	(92,842)	(77,338)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Insurance Claims [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0		0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Interest Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		20,104	(50,245)	20,730	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		39,329	(33,040)	74,826	25,288
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0		(28,999)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Other Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Mortality Swap [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		1,997	1,754	2,619	797
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	[1]	329	0	329	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3		0	0	0	0
Fair Value, end of period		(2,068)	(2,196)	(2,068)	(2,196)
Mortality Swap [Member] | Investment Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Mortality Swap [Member] | Gain (Loss) on Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Mortality Swap [Member] | Insurance Claims [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0		0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Mortality Swap [Member] | Interest Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Mortality Swap [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			0		0
Mortality Swap [Member] | Other Income [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		400	442	(222)	1,399
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		400	442	(222)	1,399
Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		1,297,382	1,237,317	1,226,970	1,310,427
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(19,635)	(1,125)	36,438	(11,958)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(54,492)	(66,137)	(195,070)	(180,019)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(26,320)	0	36,803	(3,949)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(44,110)	(47,248)	141,065	(210,544)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	3,050	10,206	3,463
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(23,255)	(9,515)	28,987	(16,417)
Fair Value, end of period		1,255,904	1,247,690	1,255,904	1,247,690
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(567)	(891)	(1,986)	(2,745)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(489)	(841)	(1,917)	(2,641)
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		17,917	(35)	(3,939)	(606)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		554,192		416,076
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		16,342		148,407
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0		0
Fair Value, end of period		573,619		573,619
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		3,085		9,136
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		3,085		9,136
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0		0
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0		0
Available-for-sale Securities [Member] | Canadian Provincial Governments [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0
Available-for-sale Securities [Member] | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		165,979	298,376	330,649	188,094
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		2,597	829	2,104	61
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(27,548)	(86,748)	(99,776)	(217,055)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	(271)	167,684	(985)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(6,935)	(12,263)	31,839	(26,599)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		1,544	453	1,544	2,853
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	(3,684)	41,524	(9,930)
Fair Value, end of period		190,693	369,667	190,693	369,667
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(40)	(378)	(411)	(674)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(40)	(378)	2	(675)
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	(143)	(1,922)	(208)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Available-for-sale Securities [Member] | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		298,816	580,510	303,836	572,960
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		3,410	(3,924)	(4,324)	(593)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(5,013)	(57,120)	(102,063)	(142,292)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	(174)	38,681	(9,145)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(18,602)	(26,776)	26,523	(94,649)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		28,285	0	53,081	9,055
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(93,444)	(4,427)	167,501	(20,877)
Fair Value, end of period		223,651	604,203	223,651	604,203
Available-for-sale Securities [Member] | Asset-backed securities | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		173	1,609	599	4,539
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		173	373	523	2,478
Available-for-sale Securities [Member] | Asset-backed securities | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	265	1,101	621
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Asset-backed securities | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | Asset-backed securities | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Asset-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		37,935	77,819	68,563	86,746
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(94)	(1,265)	(2,453)	(1,961)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0	(1,545)	(42)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	(3,197)	25,976	(6,153)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(1)	(1,144)	138	(7,157)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0	0	12,828
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(637)	0	2,182	(12,720)
Fair Value, end of period		37,507	72,643	37,507	72,643
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		304	896	1,437	2,167
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		304	841	1,335	2,070
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	(466)	(3,289)	(1,149)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Available-for-sale Securities [Member] | US Treasury and Government [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		26,255	27,359	26,265	28,529
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(135)	200	922	(183)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(147)	(157)	(404)	(432)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(312)	(267)	1,391	(1,305)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	0	0	0
Fair Value, end of period		25,833	27,320	25,833	27,320
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(122)	(92)	(367)	1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(122)	(92)	(367)	1
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	(37)	0	(154)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		35,246	40,186	38,342	42,711
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		553	(1,164)	1,725	(2,619)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(1,986)	0	(1,986)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(32)	(30)	290	(271)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	0	4,205	(835)
Fair Value, end of period		37,763	38,994	37,763	38,994
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		10	7	205	22
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		10	7	205	22
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	(5)	0	(14)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0		0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] | Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		13,706	14,657	14,065	19,663
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		48	273	336	223
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(328)	(316)	975	(939)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0	0	0	(4,333)
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Gain (Loss) on Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	0	0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Insurance Claims [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		$ 0	0	$ 0	0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			$ 0		$ 0
[1]	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Fair Value of Assets and Liab74

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Measured on Non-Recurring Basis) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Mortgage Loans on Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets Carrying Value Prior To Impairment	[1]			$ 6,913	$ 11,750
Fair Value Assets Gains Losses	[1]	$ 747	$ 67	45	106
Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets Carrying Value Prior To Impairment	[2]			4,460	12,550
Fair Value Assets Gains Losses	[2]	$ 0	$ (924)	$ (2,039)	$ (5,433)
[1]	Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows.
[2]	Limited partnership interests — The impaired limited partnership interests presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.

Fair Value of Assets and Liab75

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Assets
Mortgage loans on real estate (net of valuation allowances)		$ 3,607,700	$ 3,129,951
Policy loans		1,414,963	1,468,796
Funds withheld at interest		5,922,656	5,880,203
Cash and cash equivalents		1,379,693	1,525,275	$ 1,747,692	$ 1,645,669
Short-term investments		126,702	558,284
Other invested assets		1,777,065	1,298,120
Accrued investment income		391,837	339,452
Liabilities
Interest-sensitive contract liabilities		14,217,831	13,663,873
Short-term Debt		299,876	0
Long-term debt		2,788,834	2,297,548
Collateral finance and securitization notes		847,389	899,161
Reported Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		3,607,700	3,129,951
Policy loans		1,414,963	1,468,796
Funds withheld at interest	[1]	5,958,025	5,956,380
Cash and cash equivalents	[2]	956,236	1,118,754
Short-term investments	[2]	34,551	27,511
Other invested assets	[2]	441,792	399,799
Accrued investment income		391,837	339,452
Liabilities
Interest-sensitive contract liabilities	[1]	10,258,427	9,746,870
Short-term Debt		299,876
Long-term debt		2,788,834
Debt, Long-term and Short-term, Combined Amount			2,297,548
Collateral finance and securitization notes		847,389	899,161
Estimate of Fair Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		3,787,558	3,197,808
Policy loans		1,414,963	1,468,796
Funds withheld at interest	[1]	6,417,638	6,311,780
Cash and cash equivalents	[2]	956,236	1,118,754
Short-term investments	[2]	34,551	27,511
Other invested assets	[2]	470,669	444,342
Accrued investment income		391,837	339,452
Liabilities
Interest-sensitive contract liabilities	[1]	10,711,363	9,841,576
Short-term Debt, Fair Value		305,181
Long-term Debt, Fair Value		2,986,195
Debt, Long-term and Short-term, Combined Amount			2,415,119
Collateral finance and securitization notes		752,494	791,275
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		0	0
Policy loans		0	0
Funds withheld at interest	[1]	0	0
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	285,671	293,599
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	0	0
Short-term Debt, Fair Value		0
Long-term Debt, Fair Value		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes		0	0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		0	0
Policy loans		0	0
Funds withheld at interest	[1]	0	0
Cash and cash equivalents	[2]	956,236	1,118,754
Short-term investments	[2]	34,551	27,511
Other invested assets	[2]	13,932	4,445
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	0	0
Short-term Debt, Fair Value		0
Long-term Debt, Fair Value		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes		0	0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		0	0
Policy loans		1,414,963	1,468,796
Funds withheld at interest	[1]	0	0
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	51,765	34,886
Accrued investment income		391,837	339,452
Liabilities
Interest-sensitive contract liabilities	[1]	0	0
Short-term Debt, Fair Value		0
Long-term Debt, Fair Value		0
Debt, Long-term and Short-term, Combined Amount			0
Collateral finance and securitization notes		0	0
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member
Assets
Mortgage loans on real estate (net of valuation allowances)		3,787,558	3,197,808
Policy loans		0	0
Funds withheld at interest	[1]	6,417,638	6,311,780
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	119,301	111,412
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	10,711,363	9,841,576
Short-term Debt, Fair Value		305,181
Long-term Debt, Fair Value		2,986,195
Debt, Long-term and Short-term, Combined Amount			2,415,119
Collateral finance and securitization notes		$ 752,494	$ 791,275
[1]	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
[2]	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Fair Value of Assets and Liab76

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Narrative) (Details)	Sep. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Percentage Of Fixed Maturity Securities Classified As Level 3	7.00%	8.20%

Segment Information (Total Reve

Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,900,577	$ 2,438,634	$ 8,452,213	$ 7,589,587
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,721,052	1,399,737	4,959,854	4,381,723
CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	293,318	252,478	862,768	810,904
EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	388,822	353,588	1,128,831	1,063,696
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	446,684	433,390	1,355,570	1,265,225
Corporate and Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	50,701	(559)	145,190	68,039
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,444,917	1,312,638	4,339,737	3,910,176
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	280,959	241,438	827,871	776,532
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	289,070	284,350	880,346	863,774
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	427,647	421,970	1,299,417	1,227,159
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	276,135	87,099	620,117	471,547
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	12,359	11,040	34,897	34,372
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	99,752	69,238	248,485	199,922
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 19,037	$ 11,420	$ 56,153	$ 38,066

Segment Information (Income Los

Segment Information (Income Loss Before Provision for Income Tax of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 287,600	$ 140,137	$ 748,403	$ 538,052
Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	179,795	91,907	436,281	317,441
CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	35,435	37,329	101,559	90,017
EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	52,301	45,144	110,912	115,851
Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	27,371	16,688	111,493	82,391
Corporate and Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(7,302)	(50,931)	(11,842)	(67,648)
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	77,081	55,652	239,609	156,288
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	34,275	34,072	97,679	79,535
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	8,515	15,910	14,233	35,551
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	19,822	11,276	95,464	68,239
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	102,714	36,255	196,672	161,153
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	1,160	3,257	3,880	10,482
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	43,786	29,234	96,679	80,300
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 7,549	$ 5,412	$ 16,029	$ 14,152

Segment Information (Total Asse

Segment Information (Total Assets of Reportable Segments) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 54,832,498	$ 50,383,152
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	31,977,911	29,960,387
CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,904,326	3,631,887
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,831,383	6,920,296
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,759,120	3,970,058
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,359,758	5,900,524
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	17,883,476	16,554,509
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,820,039	3,604,344
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,703,577	2,757,593
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,010,298	3,227,530
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	14,094,435	13,405,878
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	84,287	27,543
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,127,806	4,162,703
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 748,822	$ 742,528

Commitments, Contingencies an80

Commitments, Contingencies and Guarantees (Commitments to Fund Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Limited Partner [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 318,932	$ 263,163
Commercial Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	143,870	86,325
Bank Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	50,986	48,686
Equity Release Mortgages [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	51,671	8,504
Private Placement [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 8,969	$ 0

Commitments, Contingencies an81

Commitments, Contingencies and Guarantees (Maximum Potential Obligation) (Details) $ in Millions	Sep. 30, 2016USD ($)
Commitment Period Two Thousand Twenty Three [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 500
Commitment Period Two Thousand Thirty Three [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	950
Commitment Period Two Thousand Thirty Four [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	3,000
Commitment Period Two Thousand Thirty Five [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	1,314.2
Commitment Period Two Thousand Thirty Six [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1,432

Commitments, Contingencies an82

Commitments, Contingencies and Guarantees (Guarantees Issued) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Insurance Treaty Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 782,812	$ 765,505
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	654,215	634,909
Guarantee Of Borrowed Securities [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	267,360	259,540
Product Financing Arrangement [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	131,431	100,000
Guarantee Of Lease Obligations [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 2,792	$ 5,217

Income Tax (Provision for Incom

Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 100,660	$ 49,048	$ 261,941	$ 188,318
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(2,335)	(96)	(14,617)	(5,685)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(7,078)	(16,221)	(21,567)	(29,822)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,411	10,239	13,698	21,997
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	(3,979)	(2,580)	(175)	(675)
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	0	0	0	(58)
Income Tax Reconciliation SubpartF	1,779	12,188	3,212	30,074
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(1,934)	(1,106)	(2,655)	(4,554)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(1,996)	3,747	(2,227)	(1,774)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(647)	1,384	(501)	1,076
Income Tax Expense (Benefit)	$ 88,881	$ 56,603	$ 237,109	$ 199,013
Effective Income Tax Rate Reconciliation, Percent	30.90%	40.40%	31.70%	37.00%

Employee Benefit Plans (Defined

Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,479	$ 2,307	$ 7,437	$ 6,923
Interest cost	1,168	1,262	3,503	3,788
Expected return on plan assets	(1,285)	(1,224)	(3,854)	(3,673)
Amortization of prior service cost	76	82	229	245
Amortization of prior actuarial loss	1,040	636	3,121	1,908
Total	3,478	3,063	10,436	9,191
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	131	1,868	2,162	3,046
Interest cost	408	947	1,694	1,929
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(467)	0	(467)	0
Amortization of prior actuarial loss	137	1,319	1,370	1,849
Total	$ 209	$ 4,134	$ 4,759	$ 6,824

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 8
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	10
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 8

Equity Based Compensation (Narr

Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 8.3	$ 5.7
Stock appreciation rights granted	300,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 93.53
Performance contingent units	200,000
Shares Granted To Non Employee Directors	8,908
Options exercisable (shares)	1,600,000
Options exercisable, weighted average price (per share)	$ 56.55
Options, remaining term	4 years 8 months
Compensation cost not yet recognized	$ 33.4
Period for recognition	1 year 11 months

Reinsurance (Ceded Reinsurance

Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 694,906	$ 637,859
Reinsurance Recoverables, Percentage of Total	100.00%	100.00%
Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 121,278	$ 107,077
Reinsurance Recoverables, Percentage of Total	17.50%	16.80%
AM Best, A+ Rating [Member] | Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 242,364	$ 199,479
Reinsurance Recoverables, Percentage of Total	34.90%	31.30%
AM Best, A+ Rating [Member] | Reinsurer B [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 189,424	$ 179,522
Reinsurance Recoverables, Percentage of Total	27.30%	28.10%
AM Best, A+ Rating [Member] | Reinsurer C [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 69,819	$ 72,836
Reinsurance Recoverables, Percentage of Total	10.00%	11.40%
AM Best, A++ Rating [Member] | Reinsurer E [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 34,387	$ 41,807
Reinsurance Recoverables, Percentage of Total	4.90%	6.60%
AM Best, A Rating [Member] | Reinsurer D [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 37,634	$ 37,138
Reinsurance Recoverables, Percentage of Total	5.40%	5.80%

Reinsurance (Narrative) (Detail

Reinsurance (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance Claims Recoverables	$ 267.4	$ 233.7
Claims Recoverable From Retrocessionaires Past Due	$ 3.5	$ 2
AM Best, A- Rating [Member]
Ceded Credit Risk [Line Items]
Ceded Credit Risk, Disclosure	“A- (excellent)”	“A- (excellent)”

Financing Activities (Narrative

Financing Activities (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 791
Debt Issuance Costs, Net	$ 9
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Debt Instrument, Maturity Date	Sep. 15, 2026
Debt Instrument, Face Amount	$ 400
Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Debt Instrument, Maturity Date	Jun. 15, 2056
Debt Instrument, Face Amount	$ 400
Short-term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Debt Instrument, Face Amount	$ 300