Reinsurance Group of America (RGA) 10-Q 3 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 31, 2016
Document And Entitiy Information [Abstract]
Document Type	10-Q
Document period end date	Jun. 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		64,065,779
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fixed maturity securities:
Available-for-sale at fair value (amortized cost of $30,076,884 and $28,322,977)	$ 33,160,976	$ 29,642,905
Mortgage loans on real estate (net of allowances of $6,499 and $6,813)	3,377,039	3,129,951
Policy loans	1,445,410	1,468,796
Funds withheld at interest	5,899,289	5,880,203
Short-term investments	195,979	558,284
Other invested assets	1,682,143	1,298,120
Total investments	45,760,836	41,978,259
Cash and cash equivalents	1,034,329	1,525,275
Accrued investment income	368,926	339,452
Premiums receivable and other reinsurance balances	1,917,844	1,797,504
Reinsurance ceded receivables	681,425	637,859
Deferred policy acquisition costs	3,401,935	3,392,437
Other assets	711,408	712,366
Total assets	53,876,703	50,383,152
Liabilities and Stockholders’ Equity
Future policy benefits	19,605,021	19,612,251
Interest-sensitive contract liabilities	14,024,012	13,663,873
Other policy claims and benefits	4,305,219	4,094,640
Other reinsurance balances	344,527	296,899
Deferred income taxes	2,901,264	2,218,328
Other liabilities	1,157,252	1,165,071
Short-term Debt	299,807	0
Long-term debt	2,788,473	2,297,548
Collateral finance and securitization notes	870,482	899,161
Total liabilities	46,296,057	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 June 30, 2016 and December 31, 2015	791	791
Additional paid-in capital	1,834,995	1,816,142
Retained earnings	4,870,711	4,620,303
Treasury stock, at cost - 15,068,009 and 13,933,232 shares	(1,111,225)	(1,010,139)
Accumulated other comprehensive income	1,985,374	708,284
Total stockholders’ equity	7,580,646	6,135,381
Total liabilities and stockholders’ equity	$ 53,876,703	$ 50,383,152

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for Sale at Fair value - Amortized cost	$ 30,076,884	$ 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	64,069,749	65,204,526
Treasury stock, shares	15,068,009	13,933,232
Allowances for Loan and Lease Losses, Real Estate	$ 6,499	$ 6,813

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Net premiums	$ 2,346,945	$ 2,129,043	$ 4,503,950	$ 4,152,895
Investment income, net of related expenses	507,666	450,539	924,932	877,430
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(846)	(4,137)	(34,663)	(6,664)
Other investment related gains (losses), net	119,110	(12,041)	32,041	(1,931)
Total investment related gains (losses), net	118,264	(16,178)	(2,622)	(8,595)
Other revenues	66,193	66,936	125,376	129,223
Total revenues	3,039,068	2,630,340	5,551,636	5,150,953
Benefits and Expenses:
Claims and other policy benefits	1,997,502	1,866,183	3,884,266	3,641,634
Interest credited	95,849	77,246	183,754	197,924
Policy acquisition costs and other insurance expenses	405,681	300,412	639,444	577,455
Other operating expenses	159,895	131,600	317,319	253,218
Interest expense	20,331	35,851	53,138	71,478
Collateral finance and securitization expense	6,587	5,258	12,912	11,329
Total benefits and expenses	2,685,845	2,416,550	5,090,833	4,753,038
Income before income taxes	353,223	213,790	460,803	397,915
Provision for income taxes	117,120	83,399	148,228	142,410
Net income	$ 236,103	$ 130,391	$ 312,575	$ 255,505
Earnings per share:
Basic earnings per share	$ 3.68	$ 1.97	$ 4.86	$ 3.80
Diluted earnings per share	3.64	1.94	4.81	3.76
Dividends declared per share	$ 0.37	$ 0.33	$ 0.74	$ 0.66

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive income (loss)
Net income	$ 236,103	$ 130,391	$ 312,575	$ 255,505
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	9,942	21,935	87,675	(95,836)
Net unrealized investment gains	643,893	(757,641)	1,191,118	(413,717)
Defined benefit pension and postretirement plan adjustments	1,156	834	(1,703)	1,788
Total other comprehensive income (loss), net of tax	654,991	(734,872)	1,277,090	(507,765)
Total comprehensive income (loss)	$ 891,094	$ (604,481)	$ 1,589,665	$ (252,260)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 312,575	$ 255,505
Change in operating assets and liabilities:
Accrued investment income	(34,705)	(26,656)
Premiums receivable and other reinsurance balances	(98,610)	(19,683)
Deferred policy acquisition costs	(5,435)	5,136
Reinsurance ceded receivable balances	(60,465)	(115,355)
Future policy benefits, other policy claims and benefits, and other reinsurance balances	380,297	353,946
Deferred income taxes	101,163	77,047
Other assets and other liabilities, net	(43,708)	42,363
Amortization of net investment premiums, discounts and other	(42,843)	(39,021)
Investment related (gains) losses, net	2,622	8,595
Other, net	83,555	63,815
Net cash provided by operating activities	594,446	605,692
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	2,271,414	2,742,814
Maturities of fixed maturity securities available-for-sale	273,552	232,712
Proceeds from Sale of Available-for-sale Securities, Equity	132,932	50,083
Payments to Acquire Mortgage Notes Receivable	(294,843)	(166,583)
Payments to Fund Policy Loans	(25,065)	(441)
Payments to Acquire Available-for-sale Securities, Debt	4,416,290	2,806,351
Payments to Acquire Available-for-sale Securities, Equity	408,684	68,116
Proceeds from Sale and Collection of Mortgage Notes Receivable	(543,454)	(531,317)
Payments for (Proceeds from) Policy Loans	1,679	686
Increase (Decrease) in Funds Held under Reinsurance Agreements	27,868	57,708
Payments to Acquire Businesses, Net of Cash Acquired	0	191,450
Payments to Acquire Property, Plant, and Equipment	0	(22,944)
Increase (Decrease) in Payables under Repurchase Agreements	0	(101,203)
Change in short-term investments	350,062	22,543
Change in other invested assets	(8,100)	91,562
Net cash used in investing activities	(2,058,207)	(473,037)
Cash Flows from Financing Activities:
Dividends to stockholders	(47,746)	(44,519)
Proceeds from (Repayments of) Secured Debt	(35,369)	(17,632)
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)	(1,170)
Repayments of Long-term Debt	(1,227)	(1,178)
Purchases of treasury stock	(120,806)	(262,515)
Exercise of stock options, net	5,219	12,641
Change in cash collateral for derivative positions and other arrangements	57,055	(31,244)
Deposits on universal life and other investment type policies and contracts	513,679	132,679
Withdrawals on universal life and other investment type policies and contracts	(208,743)	(363,600)
Net cash provided by (used in) financing activities	953,020	(416,478)
Effect of exchange rate changes on cash	19,795	(26,185)
Change in cash and cash equivalents	(490,946)	(310,008)
Cash and cash equivalents, beginning of period	1,525,275	1,645,669
Cash and cash equivalents, end of period	1,034,329	1,335,661
Supplemental disclosures of cash flow information:
Interest Paid, Net	68,445	74,637
Income Taxes Paid, Net	43,838	(19,307)
Transfer to Investments	1,730	118
Capital Expenditures Incurred but Not yet Paid	0	2,121
Noncash or Part Noncash Acquisition, Value of Assets Acquired	0	3,681,699
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	0	(3,490,249)
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 191,450

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS PARENTHETICAL $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 19,377

Business and Basis of Presentat

Business and Basis of Presentation	6 Months Ended
	Jun. 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 six months ended June 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	6 Months Ended
	Jun. 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Earnings: Net income (numerator for basic and diluted calculations) $ 236,103 $ 130,391 $ 312,575 $ 255,505 Shares: Weighted average outstanding shares (denominator for basic calculation) 64,126 66,351 64,348 67,246 Equivalent shares from outstanding stock options 670 769 660 785 Denominator for diluted calculation 64,796 67,120 65,008 68,031 Earnings per share: Basic $ 3.68 $ 1.97 $ 4.86 $ 3.80 Diluted $ 3.64 $ 1.94 $ 4.81 $ 3.76 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 June 30, 2016 , no stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. For the three months ended June 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	6 Months Ended
	Jun. 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 — 1,352,211 (1,352,211 ) Stock-based compensation (1) — (217,434 ) 217,434 Balance, June 30, 2016 79,137,758 15,068,009 64,069,749 Issued Held In Treasury Outstanding Balance, December 31, 2014 79,137,758 10,364,797 68,772,961 Common stock acquired — 2,791,360 (2,791,360 ) Stock-based compensation (1) — (440,059 ) 440,059 Balance, June 30, 2015 79,137,758 12,716,098 66,421,660 (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 six months of 2016, RGA repurchased 1.4 million shares of common stock under this program for $116.1 million . Accumulated Other Comprehensive Income (Loss) The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the six months ended June 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 before reclassifications 99,374 1,759,753 (6,083 ) 1,853,044 Amounts reclassified to (from) AOCI — (24,366 ) 3,467 (20,899 ) Deferred income tax benefit (expense) (11,699 ) (544,269 ) 913 (555,055 ) Balance, June 30, 2016 $ (93,476 ) $ 2,126,815 $ (47,965 ) $ 1,985,374 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 before reclassifications (89,220 ) (612,314 ) 733 (700,801 ) Amounts reclassified to (from) AOCI — (6,192 ) 1,965 (4,227 ) Deferred income tax benefit (expense) (6,616 ) 204,789 (910 ) 197,263 Balance, June 30, 2015 $ (13,989 ) $ 1,211,056 $ (47,703 ) $ 1,149,364 (1) Includes cash flow hedges of $(41,192) and $(29,397) as of June 30, 2016 and December 31, 2015 , respectively, and $(23,901) and $(31,591) as of June 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Amount Reclassified from AOCI Three months ended June 30, Six months ended June 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 $ 30,190 $ 1,829 $ 11,899 $ 4,908 Investment related gains (losses), net Cash flow hedges - Interest rate swaps 93 231 253 291 (1) Cash flow hedges - Forward bond purchase commitments (1,045 ) 1,807 (257 ) 967 (1) Deferred policy acquisition costs attributed to unrealized gains and losses 5,365 (4,307 ) 12,471 26 (2) Total 34,603 (440 ) 24,366 6,192 Provision for income taxes (9,646 ) (245 ) (4,996 ) (537 ) Net unrealized gains (losses), net of tax $ 24,957 $ (685 ) $ 19,370 $ 5,655 Amortization of defined benefit plan items: Prior service cost $ (75 ) $ (80 ) $ (153 ) $ (163 ) (3) Actuarial gains (losses) (1,841 ) (1,098 ) (3,314 ) (1,802 ) (3) Total (1,916 ) (1,178 ) (3,467 ) (1,965 ) Provision for income taxes 670 413 1,213 688 Amortization of defined benefit plans, net of tax $ (1,246 ) $ (765 ) $ (2,254 ) $ (1,277 ) Total reclassifications for the period $ 23,711 $ (1,450 ) $ 17,116 $ 4,378 (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	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 18,417,375 $ 1,260,330 $ 134,468 $ 19,543,237 58.9 % $ — Canadian and Canadian provincial governments 2,607,276 1,497,998 — 4,105,274 12.4 — Residential mortgage-backed securities 1,225,718 72,733 5,673 1,292,778 3.9 (300 ) Asset-backed securities 1,377,736 11,054 32,113 1,356,677 4.1 275 Commercial mortgage-backed securities 1,441,091 67,727 1,125 1,507,693 4.5 (1,609 ) U.S. government and agencies 1,907,648 99,690 — 2,007,338 6.1 — State and political subdivisions 538,037 74,042 6,137 605,942 1.8 — Other foreign government, supranational and foreign government-sponsored enterprises 2,562,003 190,688 10,654 2,742,037 8.3 — Total fixed maturity securities $ 30,076,884 $ 3,274,262 $ 190,170 $ 33,160,976 100.0 % $ (1,634 ) Non-redeemable preferred stock $ 66,464 $ 2,575 $ 7,936 $ 61,103 14.6 % Other equity securities 349,577 7,952 446 357,083 85.4 Total equity securities $ 416,041 $ 10,527 $ 8,382 $ 418,186 100.0 % 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 June 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities pledged as collateral $ 189,370 $ 202,763 $ 169,678 $ 176,782 Fixed maturity securities received as collateral n/a 261,461 n/a 242,914 Assets in trust held to satisfy collateral requirements 12,318,432 13,375,925 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 June 30, 2016 and December 31, 2015 (dollars in thousands). June 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 $ 853,014 $ 1,257,954 $ 864,444 $ 1,199,080 Canadian province of Quebec 1,026,507 1,854,422 943,484 1,525,903 The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at June 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 $ 776,005 $ 783,582 Due after one year through five years 6,682,598 7,007,050 Due after five years through ten years 8,706,784 9,309,939 Due after ten years 9,866,952 11,903,257 Asset and mortgage-backed securities 4,044,545 4,157,148 Total $ 30,076,884 $ 33,160,976 Corporate Fixed Maturity Securities The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016: Estimated Amortized Cost Fair Value % of Total Finance $ 6,268,530 $ 6,577,989 33.8 % Industrial 10,192,465 10,811,758 55.2 Utility 1,956,380 2,153,490 11.0 Total $ 18,417,375 $ 19,543,237 100.0 % 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 7,284 $ 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 ) — (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 908 and 2,080 fixed maturity and equity securities as of June 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): June 30, 2016 December 31, 2015 Gross Unrealized Losses % of Total Gross Unrealized Losses % of Total Less than 20% $ 150,638 75.8 % $ 463,109 73.8 % 20% or more for less than six months 8,933 4.5 142,495 22.7 20% or more for six months or greater 38,981 19.7 21,847 3.5 Total $ 198,552 100.0 % $ 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 908 and 2,080 fixed maturity and equity securities that have estimated fair values below amortized cost as of June 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 June 30, 2016: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 649,275 $ 15,424 $ 1,208,939 $ 59,206 $ 1,858,214 $ 74,630 Residential mortgage-backed securities 67,472 1,672 120,431 3,990 187,903 5,662 Asset-backed securities 534,180 18,943 258,828 10,507 793,008 29,450 Commercial mortgage-backed securities 78,002 423 41,399 702 119,401 1,125 State and political subdivisions 9,697 443 56,930 5,694 66,627 6,137 Other foreign government, supranational and foreign government-sponsored enterprises 99,330 1,135 79,592 3,677 178,922 4,812 Total investment grade securities 1,437,956 38,040 1,766,119 83,776 3,204,075 121,816 Below investment grade securities: Corporate securities 282,830 14,077 335,351 45,761 618,181 59,838 Residential mortgage-backed securities — — 379 11 379 11 Asset-backed securities 5,858 1,118 8,623 1,545 14,481 2,663 Other foreign government, supranational and foreign government-sponsored enterprises 2,328 23 59,437 5,819 61,765 5,842 Total below investment grade securities 291,016 15,218 403,790 53,136 694,806 68,354 Total fixed maturity securities $ 1,728,972 $ 53,258 $ 2,169,909 $ 136,912 $ 3,898,881 $ 190,170 Non-redeemable preferred stock $ 3,248 $ 261 $ 24,247 $ 7,675 $ 27,495 $ 7,936 Other equity securities — — 6,606 446 6,606 446 Total equity securities $ 3,248 $ 261 $ 30,853 $ 8,121 $ 34,101 $ 8,382 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 June 30, 2016 are primarily related to high-yield corporate and other foreign government, supranational and foreign government-sponsored enterprise securities. Unrealized losses decreased across most security types as treasury rates decreased during the first six 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Fixed maturity securities available-for-sale $ 323,592 $ 303,792 $ 636,007 $ 573,560 Mortgage loans on real estate 41,900 37,121 81,692 71,893 Policy loans 16,372 16,248 32,506 30,288 Funds withheld at interest 112,893 87,325 168,873 199,585 Short-term investments 985 814 1,960 1,509 Other invested assets 29,487 22,418 39,311 34,445 Investment income 525,229 467,718 960,349 911,280 Investment expense (17,563 ) (17,179 ) (35,417 ) (33,850 ) Investment income, net of related expenses $ 507,666 $ 450,539 $ 924,932 $ 877,430 Investment Related Gains (Losses), Net Investment related gains (losses), net consist of the following (dollars in thousands): Three months ended June 30, Six months ended June 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 $ (846 ) $ (4,137 ) $ (34,663 ) $ (6,664 ) Gain on investment activity 53,615 20,009 80,807 39,210 Loss on investment activity (22,556 ) (14,475 ) (34,343 ) (28,071 ) Other impairment losses and change in mortgage loan provision 211 143 (1,849 ) (4,025 ) Derivatives and other, net 87,840 (17,718 ) (12,574 ) (9,045 ) Total investment related gains (losses), net $ 118,264 $ (16,178 ) $ (2,622 ) $ (8,595 ) The fixed maturity impairments for the three and six months ended June 30, 2016 and 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 six months ended June 30, 2016 , compared to the same period in 2015 , are primarily due to changes in the fair value of interest rate swaps. During the three months ended June 30, 2016 and 2015 , the Company sold fixed maturity and equity securities with fair values of $343.3 million and $651.3 million at losses of $22.6 million and $14.5 million , respectively. During the six months ended June 30, 2016 and 2015 , the Company sold fixed maturity and equity securities with fair values of $585.8 million and $850.9 million at losses of $34.3 million and $28.1 million , respectively. The Company generally does not buy and sell securities on a short-term basis. Securities Borrowing 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 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, repurchased securities pledged and repurchased/reverse repurchased securities pledged and received as of June 30, 2016 and December 31, 2015 (dollars in thousands). June 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Borrowed securities $ 269,740 $ 289,454 $ 259,540 $ 266,297 Repurchase program/reverse repurchase program: Securities pledged 448,615 480,618 443,435 465,889 Securities received n/a 485,826 n/a 481,197 The following table presents information on the securities pledged as collateral by the Company related to its repurchase/reverse repurchase program as of June 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. June 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Collateral on repurchase program: Corporate securities $ — $ 5,329 $ 4,031 $ 137,505 $ 146,865 Residential mortgage-backed securities — — — 101,715 101,715 U.S. government and agencies — — — 212,918 212,918 Foreign government — — — 14,524 14,524 Other 4,596 — — — 4,596 Total borrowings $ 4,596 $ 5,329 $ 4,031 $ 466,662 $ 480,618 Gross amount of recognized liabilities for repurchase agreement in preceding table $ 485,826 Amounts related to agreements not included in offsetting disclosure $ 5,208 December 31, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Collateral on repurchase program: 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 borrowings $ 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 Mortgage Loans on Real Estate Mortgage loans represented approximately 7.4% and 7.5% of the Company’s total investments as of June 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 24.1% and 22.3% of mortgage loans on real estate as of June 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Property type: Recorded Investment % of Total Recorded % of Total Office building $ 1,057,245 31.3 % $ 980,858 31.3 % Retail 1,033,538 30.5 1,026,018 32.7 Industrial 708,764 20.9 527,485 16.8 Apartment 397,719 11.8 420,014 13.4 Other commercial 186,272 5.5 182,389 5.8 Total $ 3,383,538 100.0 % $ 3,136,764 100.0 % The maturities of the mortgage loans, gross of valuation allowances, as of June 30, 2016 and December 31, 2015 are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Recorded Investment % of Total Recorded Investment % of Total Due within five years $ 768,747 22.7 % $ 873,280 27.8 % Due after five years through ten years 1,800,601 53.2 1,561,535 49.8 Due after ten years 814,190 24.1 701,949 22.4 Total $ 3,383,538 100.0 % $ 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 June 30, 2016 and December 31, 2015 is as follows (dollars in thousands): June 30, 2016 December 31, 2015 Internal credit quality grade: Recorded Investment % of Total Recorded Investment % of Total High investment grade $ 1,904,494 56.3 % $ 1,621,601 51.7 % Investment grade 1,396,572 41.3 1,397,996 44.6 Average 39,444 1.2 87,196 2.8 Watch list 36,035 1.0 13,550 0.4 In or near default 6,993 0.2 16,421 0.5 Total $ 3,383,538 100.0 % $ 3,136,764 100.0 % None of the payments due to the Company on its recorded investment in mortgage loans were delinquent as of June 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Mortgage loans: Individually measured for impairment $ 6,993 $ 16,421 Collectively measured for impairment 3,376,545 3,120,343 Mortgage loans, gross of valuation allowances 3,383,538 3,136,764 Valuation allowances: Individually measured for impairment — 588 Collectively measured for impairment 6,499 6,225 Total valuation allowances 6,499 6,813 Mortgage loans, net of valuation allowances $ 3,377,039 $ 3,129,951 Information regarding the Company’s loan valuation allowances for mortgage loans for the six months ended June 30, 2016 and 2015 is as follows (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,824 $ 6,130 $ 6,813 $ 6,471 Provision (release) (325 ) (188 ) (314 ) (529 ) Balance, end of period $ 6,499 $ 5,942 $ 6,499 $ 5,942 Information regarding the portion of the Company’s mortgage loans that were impaired as of June 30, 2016 and December 31, 2015 is as follows (dollars in thousands): Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value June 30, 2016: Impaired mortgage loans with no valuation allowance recorded $ 7,495 $ 6,993 $ — $ 6,993 Impaired mortgage loans with valuation allowance recorded — — — — Total impaired mortgage loans $ 7,495 $ 6,993 $ — $ 6,993 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 June 30, 2016 2015 Average (1) Interest Income Average Recorded Investment (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 3,901 $ 107 $ 5,524 $ 35 Impaired mortgage loans with valuation allowance recorded 4,724 — 11,397 229 Total impaired mortgage loans $ 8,625 $ 107 $ 16,921 $ 264 Six months ended June 30, 2016 2015 Average (1) Interest Income Average (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 3,945 $ 216 $ 5,920 $ 141 Impaired mortgage loans with valuation allowance recorded 7,279 — 11,036 384 Total impaired mortgage loans $ 11,224 $ 216 $ 16,956 $ 525 (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 six months ended June 30, 2016 and 2015 . The Company had no mortgage loans that were on a nonaccrual status at June 30, 2016 and December 31, 2015 . Policy Loans Policy loans comprised approximately 3.2% and 3.5% of the Company’s total investments as of June 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 12.9% and 14.0% of the Company’s total investments as of June 30, 2016 and December 31, 2015 , respectively. Of the $5.9 billion funds withheld at interest balance, net of embedded derivatives, as of June 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 3.7% and 3.1% of the Company’s total investments as of June 30, 2016 and December 31, 2015 , respectively. Carrying values of these assets as of June 30, 2016 and December 31, 2015 are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Equity securities $ 418,186 $ 125,862 Limited partnership interests and real estate joint ventures 635,574 567,697 Derivatives 310,796 256,178 FVO contractholder-directed unit-linked investments 195,842 197,547 Other 121,745 150,836 Total other invested assets $ 1,682,143 $ 1,298,120

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 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 $ 1,118,523 $ 175,987 $ 970 $ 1,123,057 $ 85,075 $ 4,196 Financial futures 508,310 — — 420,665 — — Foreign currency forwards 43,000 1,703 2,732 45,000 44 6,768 Consumer price index swaps 29,208 — 613 28,561 — 292 Credit default swaps 865,000 8,635 5,300 897,000 8,230 11,053 Equity options 541,749 54,322 — 453,435 46,653 — Longevity swaps 888,480 17,781 — 868,960 15,003 7 Mortality swaps 50,000 — 1,997 50,000 — 2,619 Synthetic guaranteed investment contracts 8,235,734 — — 7,098,825 — — Embedded derivatives in: Modified coinsurance or funds withheld arrangements — — 91,981 — — 76,698 Indexed annuity products — — 841,832 — — 878,114 Variable annuity products — — 283,548 — — 192,470 Total non-hedging derivatives 12,280,004 258,428 1,228,973 10,985,503 155,005 1,172,217 Derivatives designated as hedging instruments: Interest rate swaps 435,000 — 42,038 120,000 — 29,986 Foreign currency swaps 909,524 102,406 3,383 823,486 146,265 — Total hedging derivatives 1,344,524 102,406 45,421 943,486 146,265 29,986 Total derivatives $ 13,624,528 $ 360,834 $ 1,274,394 $ 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, 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 June 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 June 30, 2016: Derivative assets $ 360,834 $ (32,257 ) $ 328,577 $ (40,876 ) $ (298,459 ) $ (10,758 ) Derivative liabilities 57,033 (32,257 ) 24,776 (74,538 ) (16,822 ) (66,584 ) 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 June 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 June 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 June 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ (3,755 ) $ 3,755 $ — For the six months ended June 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 2,112 $ (2,112 ) $ — 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 six months ended June 30, 2016 , $2.4 million and $7.0 million , respectively, of the change in the estimated fair value of derivatives, was excluded from hedge effectiveness. There were no fair value hedges as of June 30, 2015 . 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Three months ended June 30, 2016 2015 Balance beginning of period $ (21,794 ) $ (30,598 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges (20,350 ) 8,735 Amounts reclassified to investment related gains (losses), net 1,010 (1,495 ) Amounts reclassified to investment income (58 ) (543 ) Balance end of period $ (41,192 ) $ (23,901 ) Six months ended June 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 (11,799 ) 8,948 Amounts reclassified to investment related (gains) losses, net 169 (655 ) Amounts reclassified to investment income (165 ) (603 ) Balance end of period $ (41,192 ) $ (23,901 ) As of June 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 $0.5 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 inve stment 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 six months ended June 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 June 30, 2016: Interest rate swaps $ (20,350 ) $ — $ 93 Forward bond purchase commitments — (1,010 ) (35 ) Total $ (20,350 ) $ (1,010 ) $ 58 For the three months ended June 30, 2015: Interest rate swaps $ 2,417 $ — $ 231 Forward bond purchase commitments 6,318 1,495 312 Total $ 8,735 $ 1,495 $ 543 For the six months ended June 30, 2016: Interest rate swaps $ (11,799 ) $ — $ 253 Forward bond purchase commitments — (169 ) (88 ) Total $ (11,799 ) $ (169 ) $ 165 For the six months ended June 30, 2015: Interest rate swaps $ (5,150 ) $ — $ 291 Forward bond purchase commitments 14,098 655 312 Total $ 8,948 $ 655 $ 603 All components of each derivative's gain or loss were included in the assessment of hedge effectiveness. For the three and six months ended June 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Derivative Gains (Losses) Deferred in AOCI For the three months ended June 30, For the six months ended June 30, Type of NIFO Hedge (1) (2) 2016 2015 2016 2015 Foreign currency swaps $ 302 $ (12,945 ) $ (31,493 ) $ 37,021 (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 $140.4 million and $171.9 million at June 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, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. 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 six months ended June 30, 2016 and 2015 is as follows (dollars in thousands): Gain (Loss) for the three months ended June 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 41,500 $ (41,729 ) Financial futures Investment related gains (losses), net (7,557 ) (2,183 ) Foreign currency forwards Investment related gains (losses), net 3,577 (1,433 ) CPI swaps Investment related gains (losses), net (520 ) 168 Credit default swaps Investment related gains (losses), net 3,518 (187 ) Equity options Investment related gains (losses), net (3,225 ) (2,606 ) Longevity swaps Other revenues 2,394 1,911 Mortality swaps Other revenues 1,046 (478 ) Subtotal 40,733 (46,537 ) Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 76,966 (23,098 ) Indexed annuity products Interest credited (2,019 ) 8,080 Variable annuity products Investment related gains (losses), net (28,137 ) 50,878 Total non-hedging derivatives $ 87,543 $ (10,677 ) Gain (Loss) for the six months ended June 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 104,027 $ (12,385 ) Interest rate options Investment related gains (losses), net — 3,275 Financial futures Investment related gains (losses), net (18,608 ) (9,514 ) Foreign currency forwards Investment related gains (losses), net 6,077 (1,653 ) CPI swaps Investment related gains (losses), net (700 ) 97 Credit default swaps Investment related gains (losses), net 6,864 2,471 Equity options Investment related gains (losses), net (5,928 ) (10,672 ) Longevity swaps Other revenues 2,481 3,731 Mortality swaps Other revenues 622 (957 ) Subtotal 94,835 (25,607 ) Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net (15,283 ) (25,423 ) Indexed annuity products Interest credited (626 ) (21,246 ) Variable annuity products Investment related gains (losses), net (91,077 ) 25,745 Total non-hedging derivatives $ (12,151 ) $ (46,531 ) 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. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 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 $ 851 $ 151,500 4.2 $ 1,689 $ 152,500 3.9 Credit default swaps referencing indices — — — — — — Subtotal 851 151,500 4.2 1,689 152,500 3.9 BBB+/BBB/BBB- Single name credit default swaps (2,451 ) 289,200 4.2 (5,066 ) 315,200 4.2 Credit default swaps referencing indices 4,554 416,000 5.0 2,274 416,000 5.0 Subtotal 2,103 705,200 4.7 (2,792 ) 731,200 4.6 BB+/BB Single name credit default swaps (134 ) 5,000 3.2 (2,900 ) 10,000 4.1 Credit default swaps referencing indices — — — — — — Subtotal (134 ) 5,000 3.2 (2,900 ) 10,000 4.1 Total $ 2,820 $ 861,700 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 six months ended June 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 six months ended June 30, 2016 and 2015 are reflected in the following table (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Embedded derivatives in modco or funds withheld arrangements included in investment related gains $ 76,966 $ (23,098 ) $ (15,283 ) $ (25,423 ) After the associated amortization of DAC and taxes, the related amounts included in net income 18,807 (3,917 ) (7,970 ) (6,504 ) Embedded derivatives in variable annuity contracts included in investment related gains (28,137 ) 50,878 (91,077 ) 25,745 After the associated amortization of DAC and taxes, the related amounts included in net income (40,167 ) 19,608 (66,010 ) 10,198 Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses (2,019 ) 8,080 (626 ) (21,246 ) After the associated amortization of DAC and taxes, the related amounts included in net income (7,816 ) 1,233 3,418 (14,766 ) 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 June 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Estimated fair value of derivatives in net asset position $ 305,798 $ 248,968 Cash provided as collateral (1) 16,822 12,540 Securities pledged to counterparties as collateral (2) 74,538 47,149 Cash pledged from counterparties as collateral (3) (298,459 ) (245,038 ) Securities pledged from counterparties as collateral (4) (40,876 ) (20,888 ) Initial margin for cleared derivatives (2) (62,577 ) (34,898 ) Net amount after application of master netting agreements and collateral $ (4,754 ) $ 7,833 Margin account related to exchange-traded futures (5) $ 10,503 $ 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	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 are summarized below (dollars in thousands): June 30, 2016: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 19,543,237 $ 252,082 $ 17,993,773 $ 1,297,382 Canadian and Canadian provincial governments 4,105,274 — 3,551,082 554,192 Residential mortgage-backed securities 1,292,778 — 1,126,799 165,979 Asset-backed securities 1,356,677 — 1,057,861 298,816 Commercial mortgage-backed securities 1,507,693 — 1,469,758 37,935 U.S. government and agencies 2,007,338 1,874,944 106,139 26,255 State and political subdivisions 605,942 — 570,696 35,246 Other foreign government supranational and foreign government-sponsored enterprises 2,742,037 289,633 2,438,698 13,706 Total fixed maturity securities – available-for-sale 33,160,976 2,416,659 28,314,806 2,429,511 Funds withheld at interest – embedded derivatives (91,981 ) — — (91,981 ) Cash equivalents 213,556 213,556 — — Short-term investments 160,901 133,716 27,185 — Other invested assets: Non-redeemable preferred stock 61,103 48,030 13,073 — Other equity securities 357,083 357,083 — — Derivatives: Interest rate swaps 159,611 — 159,611 — Foreign currency forwards 1,498 — 1,498 — CPI swaps (613 ) — (613 ) — Credit default swaps 5,625 — 5,625 — Equity options 43,543 — 43,543 — Foreign currency swaps 101,132 — 101,132 — FVO contractholder-directed unit-linked investments 195,842 194,604 1,238 — Other 934 934 — — Total other invested assets 925,758 600,651 325,107 — Other assets - longevity swaps 17,781 — — 17,781 Total $ 34,386,991 $ 3,364,582 $ 28,667,098 $ 2,355,311 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,125,380 $ — $ — $ 1,125,380 Other liabilities: Derivatives: Interest rate swaps 26,632 — 26,632 — Foreign currency forwards 2,527 — 2,527 — Credit default swaps 2,290 — 2,290 — Equity options (10,779 ) — (10,779 ) — Foreign currency swaps 2,109 — 2,109 — Mortality swaps 1,997 — — 1,997 Total $ 1,150,156 $ — $ 22,779 $ 1,127,377 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 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 June 30, 2016 and December 31, 2015 , the Company classified approximately 7.3% 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 June 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Assets: Corporate securities $167,602 $195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 26,255 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 4,941 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (91,981 ) (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 17,781 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 841,832 878,114 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 283,548 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (7%) 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 1,997 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. The following tables present the transfers between Level 1 and Level 2 during the three and six months ended June 30, 2016 and 2015 (dollars in thousands): 2016 2015 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Three months ended June 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ — $ — $ 31,896 Six months ended June 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ — $ 625 $ 36,996 The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and six months ended June 30, 2016 , as well as the portion of gains or losses included in income for the three and six months ended June 30, 2016 attributable to unrealized gains or losses related to those assets and liabilities still held at June 30, 2016 (dollars in thousands): For the three months ended June 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 $ 1,243,660 $ 487,383 $ 333,253 $ 285,220 $ 63,574 $ 25,880 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (592 ) 3,049 116 252 490 (122 ) Investment related gains (losses), net 12 — (1,891 ) 823 (2,669 ) — Interest credited — — — — — — Included in other comprehensive income 30,391 63,760 3,839 2,793 453 461 Other revenues — — — — — — Purchases (1) 72,982 — 42,913 59,779 — 144 Sales (1) (901 ) — (167,236 ) (30,181 ) (22,338 ) — Settlements (1) (47,461 ) — (13,464 ) (4,196 ) (68 ) (108 ) Transfers into Level 3 5,023 — — 18,398 — — Transfers out of Level 3 (5,732 ) — (31,551 ) (34,072 ) (1,507 ) — Fair value, end of period $ 1,297,382 $ 554,192 $ 165,979 $ 298,816 $ 37,935 $ 26,255 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 $ (608 ) $ 3,049 $ 530 $ 187 $ 485 $ (122 ) Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the three months ended June 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 $ 34,624 $ 13,936 $ (168,948 ) $ 15,806 $ (1,118,069 ) $ (3,043 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses 12 — — — — — Investment related gains (losses), net — — 76,967 — (28,137 ) — Interest credited — — — — (2,019 ) — Included in other comprehensive income 837 95 — (419 ) — — Other revenues — — — 2,394 — 1,046 Purchases (1) — — — — 4,703 — Sales (1) — — — — — — Settlements (1) (227 ) (325 ) — — 18,142 — Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Fair value, end of period $ 35,246 $ 13,706 $ (91,981 ) $ 17,781 $ (1,125,380 ) $ (1,997 ) 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 $ 12 $ — $ — $ — $ — $ — Investment related gains (losses), net — — 76,967 — (31,333 ) — Other revenues — — — 2,394 — 1,046 Interest credited — — — — (20,162 ) — For the six months ended June 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 inco

Segment Information

Segment Information	6 Months Ended
	Jun. 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 June 30, Six months ended June 30, Revenues: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 1,494,003 $ 1,342,248 $ 2,894,820 $ 2,597,538 Non-Traditional 305,077 191,775 343,982 384,448 Total 1,799,080 1,534,023 3,238,802 2,981,986 Canada: Traditional 288,912 270,090 546,912 535,094 Non-Traditional 11,854 11,458 22,538 23,332 Total 300,766 281,548 569,450 558,426 Europe, Middle East and Africa: Traditional 301,642 284,192 591,276 579,424 Non-Traditional 80,977 75,308 148,733 130,684 Total 382,619 359,500 740,009 710,108 Asia Pacific: Traditional 477,571 411,314 871,770 805,189 Non-Traditional 17,045 7,076 37,116 26,646 Total 494,616 418,390 908,886 831,835 Corporate and Other 61,987 36,879 94,489 68,598 Total $ 3,039,068 $ 2,630,340 $ 5,551,636 $ 5,150,953 Three months ended June 30, Six months ended June 30, Income (loss) before income taxes: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 111,430 $ 82,793 $ 162,528 $ 100,636 Non-Traditional 108,854 70,393 93,958 124,898 Total 220,284 153,186 256,486 225,534 Canada: Traditional 43,309 22,736 63,404 45,463 Non-Traditional 2,128 3,094 2,720 7,225 Total 45,437 25,830 66,124 52,688 Europe, Middle East and Africa: Traditional 6,834 9,159 5,718 19,641 Non-Traditional 27,469 31,432 52,893 51,066 Total 34,303 40,591 58,611 70,707 Asia Pacific: Traditional 34,482 4,315 75,642 56,963 Non-Traditional (73 ) (1,405 ) 8,480 8,740 Total 34,409 2,910 84,122 65,703 Corporate and Other 18,790 (8,727 ) (4,540 ) (16,717 ) Total $ 353,223 $ 213,790 $ 460,803 $ 397,915 Assets: June 30, 2016 December 31, 2015 U.S. and Latin America: Traditional $ 17,806,550 $ 16,554,509 Non-Traditional 13,935,486 13,405,878 Total 31,742,036 29,960,387 Canada: Traditional 3,894,407 3,604,344 Non-Traditional 16,933 27,543 Total 3,911,340 3,631,887 Europe, Middle East and Africa: Traditional 2,669,404 2,757,593 Non-Traditional 4,076,547 4,162,703 Total 6,745,951 6,920,296 Asia Pacific: Traditional 3,757,131 3,227,530 Non-Traditional 742,063 742,528 Total 4,499,194 3,970,058 Corporate and Other 6,978,182 5,900,524 Total $ 53,876,703 $ 50,383,152

Commitments, Contingencies and

Commitments, Contingencies and Guarantees	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 are presented in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Limited partnerships and real estate joint ventures $ 252,864 $ 263,163 Commercial mortgage loans 56,139 86,325 Bank loans 51,041 48,686 Equity release mortgages 40,091 8,504 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 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 June 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 June 30, 2016 (dollars in millions): Commitment Period: June 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 June 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Treaty guarantees $ 759,175 $ 765,505 Treaty guarantees, net of assets in trust 631,267 634,909 Borrowed securities 269,740 259,540 Financing arrangements 121,369 100,000 Lease obligations 3,140 5,217

Income Tax Income Tax

Income Tax Income Tax	6 Months Ended
	Jun. 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Tax provision at U.S. statutory rate $ 123,628 $ 74,826 $ 161,281 $ 139,270 Increase (decrease) in income taxes resulting from: Foreign tax rate differing from U.S. tax rate (8,398 ) (764 ) (12,282 ) (6,285 ) Differences in tax bases in foreign jurisdictions (5,553 ) (6,931 ) (14,489 ) (13,601 ) Deferred tax valuation allowance 4,288 4,967 9,287 11,758 Amounts related to tax audit contingencies 3,288 952 3,889 1,905 Subpart F 738 11,452 1,433 17,886 Foreign tax credits (427 ) (1,104 ) (721 ) (3,448 ) Return to provision adjustments (442 ) (212 ) (316 ) (4,977 ) Other, net (2 ) 213 146 (98 ) Total provision for income taxes $ 117,120 $ 83,399 $ 148,228 $ 142,410 Effective tax rate 33.2 % 39.0 % 32.2 % 35.8 % The second quarter and first six months of 2016 effective tax rate was lower than the U.S. Statutory rate of 35.0% primarily as a result of income in non-U.S. jurisdictions with lower tax rates than the U.S. and differences in tax bases in foreign jurisdictions. The 2015 tax benefits from income in non-U.S. jurisdictions were partially offset by a tax accrual related to the Active Financing Exception business extender provision that the U.S. Congress did not pass prior to June 30, 2015.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The components of net periodic benefit costs for the three and six months ended June 30, 2016 and 2015 were as follows (dollars in thousands): Pension Benefits Other Benefits Three months ended June 30, Three months ended June 30, 2016 2015 2016 2015 Service cost $ 2,652 $ 2,586 $ 1,015 $ 589 Interest cost 1,076 1,283 643 491 Expected return on plan assets (1,345 ) (1,331 ) — — Amortization of prior service cost 75 80 — — Amortization of prior actuarial loss 1,224 833 617 265 Net periodic benefit cost $ 3,682 $ 3,451 $ 2,275 $ 1,345 Pension Benefits Other Benefits Six months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Service cost $ 4,958 $ 4,616 $ 2,031 $ 1,178 Interest cost 2,335 2,526 1,286 982 Expected return on plan assets (2,569 ) (2,449 ) — — Amortization of prior service cost 153 163 — — Amortization of prior actuarial loss 2,081 1,272 1,233 530 Net periodic benefit cost $ 6,958 $ 6,128 $ 4,550 $ 2,690 The Company has made $4.0 million in pension contributions during the first six months of 2016 and expects to make total pension contributions of $8.0 million in 2016.

Equity Based Compensation

Equity Based Compensation	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Based Compensation	Equity Based Compensation Equity compensation expense was $7.4 million and $3.1 million in the second 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 June 30, 2016 , 1.8 million share options at a weighted average strike price per share of $56.13 were vested and exercisable, with a remaining weighted average exercise period of 4.7 years. As of June 30, 2016 , the total compensation cost of non-vested awards not yet recognized in the condensed consolidated financial statements was $40.7 million . It is estimated that these costs will vest over a weighted average period of 2.1 years.

Reinsurance

Reinsurance	6 Months Ended
	Jun. 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 June 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 June 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Reinsurer A.M. Best Rating Amount % of Total Amount % of Total Reinsurer A A+ $ 233,016 34.2 % $ 199,479 31.3 % Reinsurer B A+ 190,957 28.0 179,522 28.1 Reinsurer C A+ 68,727 10.1 72,836 11.4 Reinsurer D A++ 38,098 5.6 41,807 6.6 Reinsurer E A 36,847 5.4 37,138 5.8 Other reinsurers 113,780 16.7 107,077 16.8 Total $ 681,425 100.0 % $ 637,859 100.0 % Included in the total reinsurance ceded receivables balance were $246.2 million and $233.7 million of claims recoverable, of which $4.7 million and $2.0 million were in excess of 90 days past due, as of June 30, 2016 and December 31, 2015 , respectively.

Financing Activities

Financing Activities	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Financing Activities On June 1, 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	6 Months Ended
	Jun. 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 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Earnings: Net income (numerator for basic and diluted calculations) $ 236,103 $ 130,391 $ 312,575 $ 255,505 Shares: Weighted average outstanding shares (denominator for basic calculation) 64,126 66,351 64,348 67,246 Equivalent shares from outstanding stock options 670 769 660 785 Denominator for diluted calculation 64,796 67,120 65,008 68,031 Earnings per share: Basic $ 3.68 $ 1.97 $ 4.86 $ 3.80 Diluted $ 3.64 $ 1.94 $ 4.81 $ 3.76

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 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 — 1,352,211 (1,352,211 ) Stock-based compensation (1) — (217,434 ) 217,434 Balance, June 30, 2016 79,137,758 15,068,009 64,069,749 Issued Held In Treasury Outstanding Balance, December 31, 2014 79,137,758 10,364,797 68,772,961 Common stock acquired — 2,791,360 (2,791,360 ) Stock-based compensation (1) — (440,059 ) 440,059 Balance, June 30, 2015 79,137,758 12,716,098 66,421,660 (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 six months ended June 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 before reclassifications 99,374 1,759,753 (6,083 ) 1,853,044 Amounts reclassified to (from) AOCI — (24,366 ) 3,467 (20,899 ) Deferred income tax benefit (expense) (11,699 ) (544,269 ) 913 (555,055 ) Balance, June 30, 2016 $ (93,476 ) $ 2,126,815 $ (47,965 ) $ 1,985,374 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 before reclassifications (89,220 ) (612,314 ) 733 (700,801 ) Amounts reclassified to (from) AOCI — (6,192 ) 1,965 (4,227 ) Deferred income tax benefit (expense) (6,616 ) 204,789 (910 ) 197,263 Balance, June 30, 2015 $ (13,989 ) $ 1,211,056 $ (47,703 ) $ 1,149,364 (1) Includes cash flow hedges of $(41,192) and $(29,397) as of June 30, 2016 and December 31, 2015 , respectively, and $(23,901) and $(31,591) as of June 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Amount Reclassified from AOCI Three months ended June 30, Six months ended June 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 $ 30,190 $ 1,829 $ 11,899 $ 4,908 Investment related gains (losses), net Cash flow hedges - Interest rate swaps 93 231 253 291 (1) Cash flow hedges - Forward bond purchase commitments (1,045 ) 1,807 (257 ) 967 (1) Deferred policy acquisition costs attributed to unrealized gains and losses 5,365 (4,307 ) 12,471 26 (2) Total 34,603 (440 ) 24,366 6,192 Provision for income taxes (9,646 ) (245 ) (4,996 ) (537 ) Net unrealized gains (losses), net of tax $ 24,957 $ (685 ) $ 19,370 $ 5,655 Amortization of defined benefit plan items: Prior service cost $ (75 ) $ (80 ) $ (153 ) $ (163 ) (3) Actuarial gains (losses) (1,841 ) (1,098 ) (3,314 ) (1,802 ) (3) Total (1,916 ) (1,178 ) (3,467 ) (1,965 ) Provision for income taxes 670 413 1,213 688 Amortization of defined benefit plans, net of tax $ (1,246 ) $ (765 ) $ (2,254 ) $ (1,277 ) Total reclassifications for the period $ 23,711 $ (1,450 ) $ 17,116 $ 4,378 (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)	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016: Amortized Unrealized Unrealized Estimated Fair % of Other-than- Cost Gains Losses Value Total in AOCI Available-for-sale: Corporate securities $ 18,417,375 $ 1,260,330 $ 134,468 $ 19,543,237 58.9 % $ — Canadian and Canadian provincial governments 2,607,276 1,497,998 — 4,105,274 12.4 — Residential mortgage-backed securities 1,225,718 72,733 5,673 1,292,778 3.9 (300 ) Asset-backed securities 1,377,736 11,054 32,113 1,356,677 4.1 275 Commercial mortgage-backed securities 1,441,091 67,727 1,125 1,507,693 4.5 (1,609 ) U.S. government and agencies 1,907,648 99,690 — 2,007,338 6.1 — State and political subdivisions 538,037 74,042 6,137 605,942 1.8 — Other foreign government, supranational and foreign government-sponsored enterprises 2,562,003 190,688 10,654 2,742,037 8.3 — Total fixed maturity securities $ 30,076,884 $ 3,274,262 $ 190,170 $ 33,160,976 100.0 % $ (1,634 ) Non-redeemable preferred stock $ 66,464 $ 2,575 $ 7,936 $ 61,103 14.6 % Other equity securities 349,577 7,952 446 357,083 85.4 Total equity securities $ 416,041 $ 10,527 $ 8,382 $ 418,186 100.0 % 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Fixed maturity securities pledged as collateral $ 189,370 $ 202,763 $ 169,678 $ 176,782 Fixed maturity securities received as collateral n/a 261,461 n/a 242,914 Assets in trust held to satisfy collateral requirements 12,318,432 13,375,925 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 June 30, 2016 and December 31, 2015 (dollars in thousands). June 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 $ 853,014 $ 1,257,954 $ 864,444 $ 1,199,080 Canadian province of Quebec 1,026,507 1,854,422 943,484 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 June 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 $ 776,005 $ 783,582 Due after one year through five years 6,682,598 7,007,050 Due after five years through ten years 8,706,784 9,309,939 Due after ten years 9,866,952 11,903,257 Asset and mortgage-backed securities 4,044,545 4,157,148 Total $ 30,076,884 $ 33,160,976
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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016: Estimated Amortized Cost Fair Value % of Total Finance $ 6,268,530 $ 6,577,989 33.8 % Industrial 10,192,465 10,811,758 55.2 Utility 1,956,380 2,153,490 11.0 Total $ 18,417,375 $ 19,543,237 100.0 % 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 7,284 $ 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 ) — (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 908 and 2,080 fixed maturity and equity securities as of June 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): June 30, 2016 December 31, 2015 Gross Unrealized Losses % of Total Gross Unrealized Losses % of Total Less than 20% $ 150,638 75.8 % $ 463,109 73.8 % 20% or more for less than six months 8,933 4.5 142,495 22.7 20% or more for six months or greater 38,981 19.7 21,847 3.5 Total $ 198,552 100.0 % $ 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 908 and 2,080 fixed maturity and equity securities that have estimated fair values below amortized cost as of June 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 June 30, 2016: Estimated Unrealized Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses Fair Value Losses Investment grade securities: Corporate securities $ 649,275 $ 15,424 $ 1,208,939 $ 59,206 $ 1,858,214 $ 74,630 Residential mortgage-backed securities 67,472 1,672 120,431 3,990 187,903 5,662 Asset-backed securities 534,180 18,943 258,828 10,507 793,008 29,450 Commercial mortgage-backed securities 78,002 423 41,399 702 119,401 1,125 State and political subdivisions 9,697 443 56,930 5,694 66,627 6,137 Other foreign government, supranational and foreign government-sponsored enterprises 99,330 1,135 79,592 3,677 178,922 4,812 Total investment grade securities 1,437,956 38,040 1,766,119 83,776 3,204,075 121,816 Below investment grade securities: Corporate securities 282,830 14,077 335,351 45,761 618,181 59,838 Residential mortgage-backed securities — — 379 11 379 11 Asset-backed securities 5,858 1,118 8,623 1,545 14,481 2,663 Other foreign government, supranational and foreign government-sponsored enterprises 2,328 23 59,437 5,819 61,765 5,842 Total below investment grade securities 291,016 15,218 403,790 53,136 694,806 68,354 Total fixed maturity securities $ 1,728,972 $ 53,258 $ 2,169,909 $ 136,912 $ 3,898,881 $ 190,170 Non-redeemable preferred stock $ 3,248 $ 261 $ 24,247 $ 7,675 $ 27,495 $ 7,936 Other equity securities — — 6,606 446 6,606 446 Total equity securities $ 3,248 $ 261 $ 30,853 $ 8,121 $ 34,101 $ 8,382 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 June 30, Six months ended June 30, 2016 2015 2016 2015 Fixed maturity securities available-for-sale $ 323,592 $ 303,792 $ 636,007 $ 573,560 Mortgage loans on real estate 41,900 37,121 81,692 71,893 Policy loans 16,372 16,248 32,506 30,288 Funds withheld at interest 112,893 87,325 168,873 199,585 Short-term investments 985 814 1,960 1,509 Other invested assets 29,487 22,418 39,311 34,445 Investment income 525,229 467,718 960,349 911,280 Investment expense (17,563 ) (17,179 ) (35,417 ) (33,850 ) Investment income, net of related expenses $ 507,666 $ 450,539 $ 924,932 $ 877,430
Gain Loss On Investments	Investment related gains (losses), net consist of the following (dollars in thousands): Three months ended June 30, Six months ended June 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 $ (846 ) $ (4,137 ) $ (34,663 ) $ (6,664 ) Gain on investment activity 53,615 20,009 80,807 39,210 Loss on investment activity (22,556 ) (14,475 ) (34,343 ) (28,071 ) Other impairment losses and change in mortgage loan provision 211 143 (1,849 ) (4,025 ) Derivatives and other, net 87,840 (17,718 ) (12,574 ) (9,045 ) Total investment related gains (losses), net $ 118,264 $ (16,178 ) $ (2,622 ) $ (8,595 )
Schedule of Repurchase Agreements [Table Text Block]	The following table includes the amount of borrowed securities, repurchased securities pledged and repurchased/reverse repurchased securities pledged and received as of June 30, 2016 and December 31, 2015 (dollars in thousands). June 30, 2016 December 31, 2015 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Borrowed securities $ 269,740 $ 289,454 $ 259,540 $ 266,297 Repurchase program/reverse repurchase program: Securities pledged 448,615 480,618 443,435 465,889 Securities received n/a 485,826 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 securities pledged as collateral by the Company related to its repurchase/reverse repurchase program as of June 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. June 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Collateral on repurchase program: Corporate securities $ — $ 5,329 $ 4,031 $ 137,505 $ 146,865 Residential mortgage-backed securities — — — 101,715 101,715 U.S. government and agencies — — — 212,918 212,918 Foreign government — — — 14,524 14,524 Other 4,596 — — — 4,596 Total borrowings $ 4,596 $ 5,329 $ 4,031 $ 466,662 $ 480,618 Gross amount of recognized liabilities for repurchase agreement in preceding table $ 485,826 Amounts related to agreements not included in offsetting disclosure $ 5,208 December 31, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Collateral on repurchase program: 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 borrowings $ 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Property type: Recorded Investment % of Total Recorded % of Total Office building $ 1,057,245 31.3 % $ 980,858 31.3 % Retail 1,033,538 30.5 1,026,018 32.7 Industrial 708,764 20.9 527,485 16.8 Apartment 397,719 11.8 420,014 13.4 Other commercial 186,272 5.5 182,389 5.8 Total $ 3,383,538 100.0 % $ 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 June 30, 2016 and December 31, 2015 are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Recorded Investment % of Total Recorded Investment % of Total Due within five years $ 768,747 22.7 % $ 873,280 27.8 % Due after five years through ten years 1,800,601 53.2 1,561,535 49.8 Due after ten years 814,190 24.1 701,949 22.4 Total $ 3,383,538 100.0 % $ 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 June 30, 2016 and December 31, 2015 is as follows (dollars in thousands): June 30, 2016 December 31, 2015 Internal credit quality grade: Recorded Investment % of Total Recorded Investment % of Total High investment grade $ 1,904,494 56.3 % $ 1,621,601 51.7 % Investment grade 1,396,572 41.3 1,397,996 44.6 Average 39,444 1.2 87,196 2.8 Watch list 36,035 1.0 13,550 0.4 In or near default 6,993 0.2 16,421 0.5 Total $ 3,383,538 100.0 % $ 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Mortgage loans: Individually measured for impairment $ 6,993 $ 16,421 Collectively measured for impairment 3,376,545 3,120,343 Mortgage loans, gross of valuation allowances 3,383,538 3,136,764 Valuation allowances: Individually measured for impairment — 588 Collectively measured for impairment 6,499 6,225 Total valuation allowances 6,499 6,813 Mortgage loans, net of valuation allowances $ 3,377,039 $ 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 six months ended June 30, 2016 and 2015 is as follows (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 6,824 $ 6,130 $ 6,813 $ 6,471 Provision (release) (325 ) (188 ) (314 ) (529 ) Balance, end of period $ 6,499 $ 5,942 $ 6,499 $ 5,942
Impaired Financing Receivables Table	Information regarding the portion of the Company’s mortgage loans that were impaired as of June 30, 2016 and December 31, 2015 is as follows (dollars in thousands): Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value June 30, 2016: Impaired mortgage loans with no valuation allowance recorded $ 7,495 $ 6,993 $ — $ 6,993 Impaired mortgage loans with valuation allowance recorded — — — — Total impaired mortgage loans $ 7,495 $ 6,993 $ — $ 6,993 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 June 30, 2016 2015 Average (1) Interest Income Average Recorded Investment (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 3,901 $ 107 $ 5,524 $ 35 Impaired mortgage loans with valuation allowance recorded 4,724 — 11,397 229 Total impaired mortgage loans $ 8,625 $ 107 $ 16,921 $ 264 Six months ended June 30, 2016 2015 Average (1) Interest Income Average (1) Interest Income Impaired mortgage loans with no valuation allowance recorded $ 3,945 $ 216 $ 5,920 $ 141 Impaired mortgage loans with valuation allowance recorded 7,279 — 11,036 384 Total impaired mortgage loans $ 11,224 $ 216 $ 16,956 $ 525 (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 June 30, 2016 and December 31, 2015 are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Equity securities $ 418,186 $ 125,862 Limited partnership interests and real estate joint ventures 635,574 567,697 Derivatives 310,796 256,178 FVO contractholder-directed unit-linked investments 195,842 197,547 Other 121,745 150,836 Total other invested assets $ 1,682,143 $ 1,298,120

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 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 $ 1,118,523 $ 175,987 $ 970 $ 1,123,057 $ 85,075 $ 4,196 Financial futures 508,310 — — 420,665 — — Foreign currency forwards 43,000 1,703 2,732 45,000 44 6,768 Consumer price index swaps 29,208 — 613 28,561 — 292 Credit default swaps 865,000 8,635 5,300 897,000 8,230 11,053 Equity options 541,749 54,322 — 453,435 46,653 — Longevity swaps 888,480 17,781 — 868,960 15,003 7 Mortality swaps 50,000 — 1,997 50,000 — 2,619 Synthetic guaranteed investment contracts 8,235,734 — — 7,098,825 — — Embedded derivatives in: Modified coinsurance or funds withheld arrangements — — 91,981 — — 76,698 Indexed annuity products — — 841,832 — — 878,114 Variable annuity products — — 283,548 — — 192,470 Total non-hedging derivatives 12,280,004 258,428 1,228,973 10,985,503 155,005 1,172,217 Derivatives designated as hedging instruments: Interest rate swaps 435,000 — 42,038 120,000 — 29,986 Foreign currency swaps 909,524 102,406 3,383 823,486 146,265 — Total hedging derivatives 1,344,524 102,406 45,421 943,486 146,265 29,986 Total derivatives $ 13,624,528 $ 360,834 $ 1,274,394 $ 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 June 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 June 30, 2016: Derivative assets $ 360,834 $ (32,257 ) $ 328,577 $ (40,876 ) $ (298,459 ) $ (10,758 ) Derivative liabilities 57,033 (32,257 ) 24,776 (74,538 ) (16,822 ) (66,584 ) 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 June 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 June 30, 2016: Derivative assets $ 360,834 $ (32,257 ) $ 328,577 $ (40,876 ) $ (298,459 ) $ (10,758 ) Derivative liabilities 57,033 (32,257 ) 24,776 (74,538 ) (16,822 ) (66,584 ) 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 June 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 June 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ (3,755 ) $ 3,755 $ — For the six months ended June 30, 2016: Foreign currency swaps Foreign-denominated fixed maturity securities $ 2,112 $ (2,112 ) $ —
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 six months ended June 30, 2016 and 2015 (dollars in thousands): Three months ended June 30, 2016 2015 Balance beginning of period $ (21,794 ) $ (30,598 ) Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges (20,350 ) 8,735 Amounts reclassified to investment related gains (losses), net 1,010 (1,495 ) Amounts reclassified to investment income (58 ) (543 ) Balance end of period $ (41,192 ) $ (23,901 ) Six months ended June 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 (11,799 ) 8,948 Amounts reclassified to investment related (gains) losses, net 169 (655 ) Amounts reclassified to investment income (165 ) (603 ) Balance end of period $ (41,192 ) $ (23,901 )
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 six months ended June 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 June 30, 2016: Interest rate swaps $ (20,350 ) $ — $ 93 Forward bond purchase commitments — (1,010 ) (35 ) Total $ (20,350 ) $ (1,010 ) $ 58 For the three months ended June 30, 2015: Interest rate swaps $ 2,417 $ — $ 231 Forward bond purchase commitments 6,318 1,495 312 Total $ 8,735 $ 1,495 $ 543 For the six months ended June 30, 2016: Interest rate swaps $ (11,799 ) $ — $ 253 Forward bond purchase commitments — (169 ) (88 ) Total $ (11,799 ) $ (169 ) $ 165 For the six months ended June 30, 2015: Interest rate swaps $ (5,150 ) $ — $ 291 Forward bond purchase commitments 14,098 655 312 Total $ 8,948 $ 655 $ 603
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 six months ended June 30, 2016 and 2015 (dollars in thousands): Derivative Gains (Losses) Deferred in AOCI For the three months ended June 30, For the six months ended June 30, Type of NIFO Hedge (1) (2) 2016 2015 2016 2015 Foreign currency swaps $ 302 $ (12,945 ) $ (31,493 ) $ 37,021 (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 six months ended June 30, 2016 and 2015 is as follows (dollars in thousands): Gain (Loss) for the three months ended June 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 41,500 $ (41,729 ) Financial futures Investment related gains (losses), net (7,557 ) (2,183 ) Foreign currency forwards Investment related gains (losses), net 3,577 (1,433 ) CPI swaps Investment related gains (losses), net (520 ) 168 Credit default swaps Investment related gains (losses), net 3,518 (187 ) Equity options Investment related gains (losses), net (3,225 ) (2,606 ) Longevity swaps Other revenues 2,394 1,911 Mortality swaps Other revenues 1,046 (478 ) Subtotal 40,733 (46,537 ) Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net 76,966 (23,098 ) Indexed annuity products Interest credited (2,019 ) 8,080 Variable annuity products Investment related gains (losses), net (28,137 ) 50,878 Total non-hedging derivatives $ 87,543 $ (10,677 ) Gain (Loss) for the six months ended June 30, Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2016 2015 Interest rate swaps Investment related gains (losses), net $ 104,027 $ (12,385 ) Interest rate options Investment related gains (losses), net — 3,275 Financial futures Investment related gains (losses), net (18,608 ) (9,514 ) Foreign currency forwards Investment related gains (losses), net 6,077 (1,653 ) CPI swaps Investment related gains (losses), net (700 ) 97 Credit default swaps Investment related gains (losses), net 6,864 2,471 Equity options Investment related gains (losses), net (5,928 ) (10,672 ) Longevity swaps Other revenues 2,481 3,731 Mortality swaps Other revenues 622 (957 ) Subtotal 94,835 (25,607 ) Embedded derivatives in: Modified coinsurance or funds withheld arrangements Investment related gains (losses), net (15,283 ) (25,423 ) Indexed annuity products Interest credited (626 ) (21,246 ) Variable annuity products Investment related gains (losses), net (91,077 ) 25,745 Total non-hedging derivatives $ (12,151 ) $ (46,531 )
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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 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 $ 851 $ 151,500 4.2 $ 1,689 $ 152,500 3.9 Credit default swaps referencing indices — — — — — — Subtotal 851 151,500 4.2 1,689 152,500 3.9 BBB+/BBB/BBB- Single name credit default swaps (2,451 ) 289,200 4.2 (5,066 ) 315,200 4.2 Credit default swaps referencing indices 4,554 416,000 5.0 2,274 416,000 5.0 Subtotal 2,103 705,200 4.7 (2,792 ) 731,200 4.6 BB+/BB Single name credit default swaps (134 ) 5,000 3.2 (2,900 ) 10,000 4.1 Credit default swaps referencing indices — — — — — — Subtotal (134 ) 5,000 3.2 (2,900 ) 10,000 4.1 Total $ 2,820 $ 861,700 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 six months ended June 30, 2016 and 2015 are reflected in the following table (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Embedded derivatives in modco or funds withheld arrangements included in investment related gains $ 76,966 $ (23,098 ) $ (15,283 ) $ (25,423 ) After the associated amortization of DAC and taxes, the related amounts included in net income 18,807 (3,917 ) (7,970 ) (6,504 ) Embedded derivatives in variable annuity contracts included in investment related gains (28,137 ) 50,878 (91,077 ) 25,745 After the associated amortization of DAC and taxes, the related amounts included in net income (40,167 ) 19,608 (66,010 ) 10,198 Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses (2,019 ) 8,080 (626 ) (21,246 ) After the associated amortization of DAC and taxes, the related amounts included in net income (7,816 ) 1,233 3,418 (14,766 )
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 June 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Estimated fair value of derivatives in net asset position $ 305,798 $ 248,968 Cash provided as collateral (1) 16,822 12,540 Securities pledged to counterparties as collateral (2) 74,538 47,149 Cash pledged from counterparties as collateral (3) (298,459 ) (245,038 ) Securities pledged from counterparties as collateral (4) (40,876 ) (20,888 ) Initial margin for cleared derivatives (2) (62,577 ) (34,898 ) Net amount after application of master netting agreements and collateral $ (4,754 ) $ 7,833 Margin account related to exchange-traded futures (5) $ 10,503 $ 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)	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 are summarized below (dollars in thousands): June 30, 2016: Fair Value Measurements Using: Total Level 1 Level 2 Level 3 Assets: Fixed maturity securities – available-for-sale: Corporate securities $ 19,543,237 $ 252,082 $ 17,993,773 $ 1,297,382 Canadian and Canadian provincial governments 4,105,274 — 3,551,082 554,192 Residential mortgage-backed securities 1,292,778 — 1,126,799 165,979 Asset-backed securities 1,356,677 — 1,057,861 298,816 Commercial mortgage-backed securities 1,507,693 — 1,469,758 37,935 U.S. government and agencies 2,007,338 1,874,944 106,139 26,255 State and political subdivisions 605,942 — 570,696 35,246 Other foreign government supranational and foreign government-sponsored enterprises 2,742,037 289,633 2,438,698 13,706 Total fixed maturity securities – available-for-sale 33,160,976 2,416,659 28,314,806 2,429,511 Funds withheld at interest – embedded derivatives (91,981 ) — — (91,981 ) Cash equivalents 213,556 213,556 — — Short-term investments 160,901 133,716 27,185 — Other invested assets: Non-redeemable preferred stock 61,103 48,030 13,073 — Other equity securities 357,083 357,083 — — Derivatives: Interest rate swaps 159,611 — 159,611 — Foreign currency forwards 1,498 — 1,498 — CPI swaps (613 ) — (613 ) — Credit default swaps 5,625 — 5,625 — Equity options 43,543 — 43,543 — Foreign currency swaps 101,132 — 101,132 — FVO contractholder-directed unit-linked investments 195,842 194,604 1,238 — Other 934 934 — — Total other invested assets 925,758 600,651 325,107 — Other assets - longevity swaps 17,781 — — 17,781 Total $ 34,386,991 $ 3,364,582 $ 28,667,098 $ 2,355,311 Liabilities: Interest sensitive contract liabilities – embedded derivatives $ 1,125,380 $ — $ — $ 1,125,380 Other liabilities: Derivatives: Interest rate swaps 26,632 — 26,632 — Foreign currency forwards 2,527 — 2,527 — Credit default swaps 2,290 — 2,290 — Equity options (10,779 ) — (10,779 ) — Foreign currency swaps 2,109 — 2,109 — Mortality swaps 1,997 — — 1,997 Total $ 1,150,156 $ — $ 22,779 $ 1,127,377 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 June 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Assets: Corporate securities $167,602 $195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 26,255 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 4,941 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (91,981 ) (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 17,781 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 841,832 878,114 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 283,548 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (7%) 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 1,997 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 June 30, 2016 and December 31, 2015 (dollars in thousands): Estimated Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Assets: Corporate securities $167,602 $195,557 Market comparable securities Liquidity premium 0-2% (1%) 0-2% (1%) U.S. government and agencies 26,255 26,265 Market comparable securities Liquidity premium 0-1% (1%) 0-1% (1%) State and political subdivisions 4,941 4,770 Market comparable securities Liquidity premium 1 % 1 % Funds withheld at interest- embedded derivatives (91,981 ) (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 17,781 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 841,832 878,114 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 283,548 192,470 Discounted cash flow Mortality 0-100% (2%) 0-100% (2%) Lapse 0-25% (7%) 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 1,997 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 six months ended June 30, 2016 and 2015 (dollars in thousands): 2016 2015 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Transfers from Level 1 to Level 2 Transfers from Level 2 to Level 1 Three months ended June 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ — $ — $ 31,896 Six months ended June 30: Fixed maturity securities - available-for-sale: Corporate securities $ — $ — $ 625 $ 36,996
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 six months ended June 30, 2016 , as well as the portion of gains or losses included in income for the three and six months ended June 30, 2016 attributable to unrealized gains or losses related to those assets and liabilities still held at June 30, 2016 (dollars in thousands): For the three months ended June 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 $ 1,243,660 $ 487,383 $ 333,253 $ 285,220 $ 63,574 $ 25,880 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (592 ) 3,049 116 252 490 (122 ) Investment related gains (losses), net 12 — (1,891 ) 823 (2,669 ) — Interest credited — — — — — — Included in other comprehensive income 30,391 63,760 3,839 2,793 453 461 Other revenues — — — — — — Purchases (1) 72,982 — 42,913 59,779 — 144 Sales (1) (901 ) — (167,236 ) (30,181 ) (22,338 ) — Settlements (1) (47,461 ) — (13,464 ) (4,196 ) (68 ) (108 ) Transfers into Level 3 5,023 — — 18,398 — — Transfers out of Level 3 (5,732 ) — (31,551 ) (34,072 ) (1,507 ) — Fair value, end of period $ 1,297,382 $ 554,192 $ 165,979 $ 298,816 $ 37,935 $ 26,255 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 $ (608 ) $ 3,049 $ 530 $ 187 $ 485 $ (122 ) Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the three months ended June 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 $ 34,624 $ 13,936 $ (168,948 ) $ 15,806 $ (1,118,069 ) $ (3,043 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses 12 — — — — — Investment related gains (losses), net — — 76,967 — (28,137 ) — Interest credited — — — — (2,019 ) — Included in other comprehensive income 837 95 — (419 ) — — Other revenues — — — 2,394 — 1,046 Purchases (1) — — — — 4,703 — Sales (1) — — — — — — Settlements (1) (227 ) (325 ) — — 18,142 — Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Fair value, end of period $ 35,246 $ 13,706 $ (91,981 ) $ 17,781 $ (1,125,380 ) $ (1,997 ) 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 $ 12 $ — $ — $ — $ — $ — Investment related gains (losses), net — — 76,967 — (31,333 ) — Other revenues — — — 2,394 — 1,046 Interest credited — — — — (20,162 ) — For the six months ended June 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 (1,419 ) 6,051 (371 ) 426 1,133 (245 ) Investment related gains (losses), net (21,856 ) — (1,922 ) 1,101 (3,289 ) — Interest credited — — — — — — Included in other comprehensive income 56,073 132,065 (493 ) (7,734 ) (2,359 ) 1,057 Other revenues — — — — — — Purchases (1) 140,578 — 72,228 97,050 1,545 257 Sales (1) (10,483 ) — (167,684 ) (38,681 ) (25,976 ) — Settlements (1) (96,955 ) — (24,904 ) (7,921 ) (137 ) (1,079 ) Transfers into Level 3 10,206 — — 24,796 — — Transfers out of Level 3 (5,732 ) — (41,524 ) (74,057 ) (1,545 ) — Fair value, end of period $ 1,297,382 $ 554,192 $ 165,979 $ 298,816 $ 37,935 $ 26,255 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 $ (1,428 ) $ 6,051 $ 42 $ 350 $ 1,031 $ (245 ) Investment related gains (losses), net (21,726 ) — — — — — Interest credited — — — — — — For the six months ended June 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 195 — — — — — Investment related gains (losses), net — — (15,283 ) — (91,077 ) — Interest credited — — — — (626 ) — Included in other comprehensive income 1,171 288 — 304 — — Other revenues — — — 2,481 — 622 Purchases (1) — — — — 2,035 — Sales (1) — — — — — — Settlements (1) (258 ) (647 ) — — 34,872 — Transfers into Level 3 — — — — — — Transfers out of Level 3 (4,204 ) — — — — — Fair value, end of period $ 35,246 $ 13,706 $ (91,981 ) $ 17,781 $ (1,125,380 ) $ (1,997 ) 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 $ 195 $ — $ — $ — $ — $ — Investment related gains (losses), net — — (15,283 ) — (96,811 ) — Other revenues — — — 2,481 — 622 Interest credited — — — — (35,497 ) — (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 six months ended June 30, 2015 , as well as the portion of gains or losses included in income for the three and six months ended June 30, 2015 attributable to unrealized gains or losses related to those assets and liabilities still held at June 30, 2015 (dollars in thousands): For the three months ended June 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 $ 1,286,979 $ 192,579 $ 609,436 $ 93,869 $ 27,756 $ 41,875 Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses (1,051 ) (156 ) 1,511 677 112 8 Investment related gains (losses), net (166 ) 17 283 (770 ) (10 ) (5 ) Interest credited — — — — — — Included in other comprehensive income (16,902 ) (1,291 ) (301 ) (386 ) (559 ) (1,480 ) Purchases (1) 76,982 118,868 44,181 42 154 — Sales (1) (3,949 ) — (1,615 ) (2,000 ) — — Settlements (1) (103,696 ) (8,617 ) (63,751 ) (893 ) (94 ) (212 ) Transfers into Level 3 413 1,800 — — — — Transfers out of Level 3 (1,293 ) (4,824 ) (9,234 ) (12,720 ) — — Fair value, end of period $ 1,237,317 $ 298,376 $ 580,510 $ 77,819 $ 27,359 $ 40,186 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 $ (997 ) $ (156 ) $ 706 $ 640 $ 112 $ 8 Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the three months ended June 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 $ 15,202 $ 19,769 $ 7,992 $ 8,602 $ (1,132,271 ) $ (1,276 ) Total gains/losses (realized/unrealized) Included in earnings, net: Investment income, net of related expenses — — — — — — Investment related gains (losses), net — (23,098 ) — — 50,878 — Interest credited — — — — 8,080 — Included in other comprehensive income (232 ) — (104 ) 340 — — Other revenues — — — 1,911 — (478 ) Purchases (1) — — 4,500 — (13,924 ) — Sales (1) — — — — — — Settlements (1) (313 ) — — — 18,083 — Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Fair value, end of period $ 14,657 $ (3,329 ) $ 12,388 $ 10,853 $ (1,069,154 ) $ (1,754 ) 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 — (23,098 ) — — 48,603 — Other revenues — — — 1,911 — (478 ) Interest credited — — — — (10,003 ) — For the six months ended June 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 (1,854 ) (296 ) 2,930 1,271 93 15 Investment related gains (losses), net (571 ) (65 ) 356 (683 ) (117 ) (9 ) Interest credited — — — — — — Included in other comprehensive income (10,833 ) (768 ) 3,331 (696 ) (383 ) (1,455 ) Purchases (1) 113,882 130,307 85,172 42 275 — Sales (1) (3,949 ) (714 ) (8,971 ) (2,956 ) — — Settlements (1) (163,296 ) (14,336 ) (67,873 ) (6,013 ) (1,038 ) (241 ) Transfers into Level 3 413 2,400 9,055 12,828 — — Transfers out of Level 3 (6,902 ) (6,246 ) (16,450 ) (12,720 ) — (835 ) Fair value, end of period $ 1,237,317 $ 298,376 $ 580,510 $ 77,819 $ 27,359 $ 40,186 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 $ (1,800 ) $ (297 ) $ 2,105 $ 1,229 $ 93 $ 15 Investment related gains (losses), net — — — — — — Interest credited — — — — — — For the six months ended June 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 — (25,423 ) — — 25,745 — Policy acquisition costs and other insurance expenses — — — — (21,246 ) — Included in other comprehensive income (50 ) — (16 ) (605 ) — — Other revenues — — — 3,731 — (957 ) Purchases (1) — — 4,529 — (25,568 ) — Sales (1) — — — — — — Settlements (1) (623 ) — — — — — Transfers into Level 3 — — — — 37,081 — Transfers out of Level 3 (4,333 ) — (29 ) — — — Fair value, end of period $ 14,657 $ (3,329 ) $ 12,388 $ 10,853 $ (1,069,154 ) $ (1,754 ) 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 — (25,423 ) — — 20,358 — Other revenues — — — 3,731 — (957 ) Interest credited — — — — (58,327 ) — (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 June 30, Three months ended June 30, Six months ended June 30, (dollars in thousands) 2016 2015 2016 2015 2016 2015 Mortgage loans (1) $ 6,993 $ 5,850 $ (400 ) $ (11 ) $ (702 ) $ 39 Limited partnership interests (2) 4,460 13,667 (112 ) — (2,039 ) (4,509 ) (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 June 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. June 30, 2016: Carrying Value Estimated Fair Value Fair Value Measurement Using: Level 1 Level 2 Level 3 NAV Assets: Mortgage loans on real estate $ 3,377,039 $ 3,502,098 $ — $ — $ 3,502,098 $ — Policy loans 1,445,410 1,445,410 — 1,445,410 — — Funds withheld at interest (1) 5,987,794 6,368,471 — — 6,368,471 — Cash and cash equivalents (2) 820,773 820,773 820,773 — — — Short-term investments (2) 35,078 35,078 35,078 — — — Other invested assets (2) 383,295 409,054 4,297 36,151 86,092 282,514 Accrued investment income 368,926 368,926 — 368,926 — — Liabilities: Interest-sensitive contract liabilities (1) $ 10,058,118 $ 10,650,840 $ — $ — $ 10,650,840 $ — Short-term debt 299,807 308,457 — — 308,457 — Long-term debt 2,788,473 2,954,981 — — 2,954,981 — Collateral finance and securitization notes 870,482 790,304 — — 790,304 — 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)	6 Months Ended
	Jun. 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 June 30, Six months ended June 30, Revenues: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 1,494,003 $ 1,342,248 $ 2,894,820 $ 2,597,538 Non-Traditional 305,077 191,775 343,982 384,448 Total 1,799,080 1,534,023 3,238,802 2,981,986 Canada: Traditional 288,912 270,090 546,912 535,094 Non-Traditional 11,854 11,458 22,538 23,332 Total 300,766 281,548 569,450 558,426 Europe, Middle East and Africa: Traditional 301,642 284,192 591,276 579,424 Non-Traditional 80,977 75,308 148,733 130,684 Total 382,619 359,500 740,009 710,108 Asia Pacific: Traditional 477,571 411,314 871,770 805,189 Non-Traditional 17,045 7,076 37,116 26,646 Total 494,616 418,390 908,886 831,835 Corporate and Other 61,987 36,879 94,489 68,598 Total $ 3,039,068 $ 2,630,340 $ 5,551,636 $ 5,150,953
Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block	Three months ended June 30, Six months ended June 30, Income (loss) before income taxes: 2016 2015 2016 2015 U.S. and Latin America: Traditional $ 111,430 $ 82,793 $ 162,528 $ 100,636 Non-Traditional 108,854 70,393 93,958 124,898 Total 220,284 153,186 256,486 225,534 Canada: Traditional 43,309 22,736 63,404 45,463 Non-Traditional 2,128 3,094 2,720 7,225 Total 45,437 25,830 66,124 52,688 Europe, Middle East and Africa: Traditional 6,834 9,159 5,718 19,641 Non-Traditional 27,469 31,432 52,893 51,066 Total 34,303 40,591 58,611 70,707 Asia Pacific: Traditional 34,482 4,315 75,642 56,963 Non-Traditional (73 ) (1,405 ) 8,480 8,740 Total 34,409 2,910 84,122 65,703 Corporate and Other 18,790 (8,727 ) (4,540 ) (16,717 ) Total $ 353,223 $ 213,790 $ 460,803 $ 397,915
Reconciliation Of Assets From Segment To Consolidated Text Block	Assets: June 30, 2016 December 31, 2015 U.S. and Latin America: Traditional $ 17,806,550 $ 16,554,509 Non-Traditional 13,935,486 13,405,878 Total 31,742,036 29,960,387 Canada: Traditional 3,894,407 3,604,344 Non-Traditional 16,933 27,543 Total 3,911,340 3,631,887 Europe, Middle East and Africa: Traditional 2,669,404 2,757,593 Non-Traditional 4,076,547 4,162,703 Total 6,745,951 6,920,296 Asia Pacific: Traditional 3,757,131 3,227,530 Non-Traditional 742,063 742,528 Total 4,499,194 3,970,058 Corporate and Other 6,978,182 5,900,524 Total $ 53,876,703 $ 50,383,152

Commitments, Contingencies an28

Commitments, Contingencies and Guarantees (Tables)	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 are presented in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Limited partnerships and real estate joint ventures $ 252,864 $ 263,163 Commercial mortgage loans 56,139 86,325 Bank loans 51,041 48,686 Equity release mortgages 40,091 8,504
Other Commitments [Table Text Block]	The following table presents the maximum potential obligation for these commitments as of June 30, 2016 (dollars in millions): Commitment Period: June 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 June 30, 2016 and December 31, 2015 are reflected in the following table (dollars in thousands): June 30, 2016 December 31, 2015 Treaty guarantees $ 759,175 $ 765,505 Treaty guarantees, net of assets in trust 631,267 634,909 Borrowed securities 269,740 259,540 Financing arrangements 121,369 100,000 Lease obligations 3,140 5,217

Income Tax (Tables)

Income Tax (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2016 and 2015 (dollars in thousands): Three months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Tax provision at U.S. statutory rate $ 123,628 $ 74,826 $ 161,281 $ 139,270 Increase (decrease) in income taxes resulting from: Foreign tax rate differing from U.S. tax rate (8,398 ) (764 ) (12,282 ) (6,285 ) Differences in tax bases in foreign jurisdictions (5,553 ) (6,931 ) (14,489 ) (13,601 ) Deferred tax valuation allowance 4,288 4,967 9,287 11,758 Amounts related to tax audit contingencies 3,288 952 3,889 1,905 Subpart F 738 11,452 1,433 17,886 Foreign tax credits (427 ) (1,104 ) (721 ) (3,448 ) Return to provision adjustments (442 ) (212 ) (316 ) (4,977 ) Other, net (2 ) 213 146 (98 ) Total provision for income taxes $ 117,120 $ 83,399 $ 148,228 $ 142,410 Effective tax rate 33.2 % 39.0 % 32.2 % 35.8 %

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2016 and 2015 were as follows (dollars in thousands): Pension Benefits Other Benefits Three months ended June 30, Three months ended June 30, 2016 2015 2016 2015 Service cost $ 2,652 $ 2,586 $ 1,015 $ 589 Interest cost 1,076 1,283 643 491 Expected return on plan assets (1,345 ) (1,331 ) — — Amortization of prior service cost 75 80 — — Amortization of prior actuarial loss 1,224 833 617 265 Net periodic benefit cost $ 3,682 $ 3,451 $ 2,275 $ 1,345 Pension Benefits Other Benefits Six months ended June 30, Six months ended June 30, 2016 2015 2016 2015 Service cost $ 4,958 $ 4,616 $ 2,031 $ 1,178 Interest cost 2,335 2,526 1,286 982 Expected return on plan assets (2,569 ) (2,449 ) — — Amortization of prior service cost 153 163 — — Amortization of prior actuarial loss 2,081 1,272 1,233 530 Net periodic benefit cost $ 6,958 $ 6,128 $ 4,550 $ 2,690

Reinsurance (Tables)

Reinsurance (Tables)	6 Months Ended
	Jun. 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 June 30, 2016 and December 31, 2015 (dollars in thousands): June 30, 2016 December 31, 2015 Reinsurer A.M. Best Rating Amount % of Total Amount % of Total Reinsurer A A+ $ 233,016 34.2 % $ 199,479 31.3 % Reinsurer B A+ 190,957 28.0 179,522 28.1 Reinsurer C A+ 68,727 10.1 72,836 11.4 Reinsurer D A++ 38,098 5.6 41,807 6.6 Reinsurer E A 36,847 5.4 37,138 5.8 Other reinsurers 113,780 16.7 107,077 16.8 Total $ 681,425 100.0 % $ 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 236,103	$ 130,391	$ 312,575	$ 255,505
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,126	66,351	64,348	67,246
Equivalent shares from outstanding stock options	670	769	660	785
Denominator for diluted calculation	64,796	67,120	65,008	68,031
Earnings Per Share:
Basic earnings per share	$ 3.68	$ 1.97	$ 4.86	$ 3.80
Diluted earnings per share	$ 3.64	$ 1.94	$ 4.81	$ 3.76

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 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
		Jun. 30, 2016	Jun. 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		15,068,009	12,716,098	13,933,232	10,364,797
Treasury Stock, Shares, Acquired		1,352,211	2,791,360
Stock Based Compensation Shares	[1]	(217,434)	(440,059)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,069,749	66,421,660	65,204,526	68,772,961
Treasury Stock, Shares, Acquired		(1,352,211)	(2,791,360)
Stock Based Compensation Shares	[1]	217,434	440,059
[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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income		$ 1,985,374	$ 1,149,364	$ 708,284	$ 1,657,129
Other Comprehensive Income (Loss), before Reclassifications, before Tax		1,853,044	(700,801)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(20,899)	(4,227)
Other Comprehensive Income (Loss), Tax		555,055	(197,263)
Accumulated Translation Adjustment [Member]
Accumulated other comprehensive income		(93,476)	(13,989)	(181,151)	81,847
Other Comprehensive Income (Loss), before Reclassifications, before Tax		99,374	(89,220)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		(11,699)	(6,616)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income	[1]	2,126,815	1,211,056	935,697	1,624,773
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	1,759,753	(612,314)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(24,366)	(6,192)
Other Comprehensive Income (Loss), Tax	[1]	544,269	(204,789)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive income		(47,965)	(47,703)	$ (46,262)	$ (49,491)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(6,083)	733
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		3,467	1,965
Other Comprehensive Income (Loss), Tax		$ (913)	$ 910
[1]	Includes cash flow hedges of $(41,192) and $(29,397) as of June 30, 2016 and December 31, 2015, respectively, and $(23,901) and $(31,591) as of June 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				6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 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	$ (41,192)	$ (21,794)	$ (23,901)	$ (30,598)	$ (41,192)	$ (23,901)	$ (29,397)	$ (31,591)

Equity (Schedule of Reclassific

Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment related gains (losses), net		$ 119,110		$ (12,041)		$ 32,041		$ (1,931)
Investment income		507,666		450,539		924,932		877,430
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		353,223		213,790		460,803		397,915
Income Tax Expense (Benefit)		(117,120)		(83,399)		(148,228)		(142,410)
Net income		236,103		130,391		312,575		255,505
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		34,603		(440)		24,366		6,192
Income Tax Expense (Benefit)		(9,646)		(245)		(4,996)		(537)
Net income		24,957		(685)		19,370		5,655
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		30,190		1,829		11,899		4,908
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]	93		231		253		291
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]	(1,045)		1,807		(257)		967
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		5,365	[1]	(4,307)	[1]	(12,471)	[2]	26	[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		(1,916)		(1,178)		(3,467)		(1,965)
Income Tax Expense (Benefit)		670		413		1,213		688
Net income		(1,246)		(765)		(2,254)		(1,277)
Amounts Reclassified From AOCI [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income		23,711		(1,450)		17,116		4,378
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		(75)	[2]	(80)	[2]	(153)	[3]	(163)	[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)		$ (1,841)	[2]	$ (1,098)	[2]	$ 3,314	[3]	$ (1,802)	[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
	Jun. 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	$ 116.1

Investments (Investments in Fix

Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 18,417,375	$ 17,575,507
Estimated Fair Value	$ 19,543,237	$ 17,708,156
% of Total	100.00%	100.00%
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 30,076,884	$ 28,322,977
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3,274,262	1,939,175
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	190,170	619,247
Estimated Fair Value	$ 33,160,976	$ 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	416,041	126,229
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10,527	7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8,382	8,204
Estimated Fair Value	$ 418,186	$ 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	$ 18,417,375	$ 17,575,507
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,260,330	599,718
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	134,468	467,069
Estimated Fair Value	$ 19,543,237	$ 17,708,156
% of Total	58.90%	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	2,607,276	2,469,009
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,497,998	1,110,282
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	2,532
Estimated Fair Value	$ 4,105,274	$ 3,576,759
% of Total	12.40%	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	1,225,718	1,277,998
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	72,733	45,152
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,673	11,673
Estimated Fair Value	$ 1,292,778	$ 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	1,377,736	1,219,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	11,054	12,052
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	32,113	18,376
Estimated Fair Value	$ 1,356,677	$ 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	1,441,091	1,456,848
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	67,727	37,407
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,125	11,168
Estimated Fair Value	$ 1,507,693	$ 1,483,087
% of Total	4.50%	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	1,907,648	1,423,791
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	99,690	15,586
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	57,718
Estimated Fair Value	$ 2,007,338	$ 1,381,659
% of Total	6.10%	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	538,037	480,067
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	74,042	40,014
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	6,137	9,067
Estimated Fair Value	$ 605,942	$ 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	2,562,003	2,420,757
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	190,688	78,964
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	10,654	41,644
Estimated Fair Value	$ 2,742,037	$ 2,458,077
% of Total	8.30%	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	66,464	85,645
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,575	7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	7,936	5,962
Estimated Fair Value	$ 61,103	$ 87,520
% of Total	14.60%	69.50%
Other equity securities | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 349,577	$ 40,584
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7,952	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	446	2,242
Estimated Fair Value	$ 357,083	$ 38,342
% of Total	85.40%	30.50%

Investments (Fixed Maturity Sec

Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 18,417,375	$ 17,575,507
Available-for-sale Securities	19,543,237	17,708,156
Collateral Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	189,370	169,678
Available-for-sale Securities	202,763	176,782
Collateral Received Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	261,461	242,914
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	12,318,432	10,535,729
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Assets Held-in-trust	$ 13,375,925	$ 10,928,393

Investments (Exposure To Concen

Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 18,417,375	$ 17,575,507
Available-for-sale Securities	19,543,237	17,708,156
Canadian Province Of Quebec Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,026,507	943,484
Available-for-sale Securities	1,854,422	1,525,903
Canadian Province Of Ontario Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	853,014	864,444
Available-for-sale Securities	$ 1,257,954	$ 1,199,080

Investments (Amortized Cost and

Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 776,005
Due after one year through five years	6,682,598
Due after five year through ten years	8,706,784
Due after ten years	9,866,952
Asset and mortgage-backed securities	4,044,545
Total	30,076,884	$ 28,322,977
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	783,582
Due after one year through five years	7,007,050
Due after five year through ten years	9,309,939
Due after ten years	11,903,257
Asset and mortgage-backed securities	4,157,148
Total	$ 33,160,976	$ 29,642,905

Investments (Amortized Cost a43

Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 18,417,375	$ 17,575,507
Estimated Fair Value	$ 19,543,237	$ 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	$ 6,268,530	$ 5,408,791
Estimated Fair Value	$ 6,577,989	$ 5,555,044
% of Total	33.80%	31.40%
Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 10,192,465	$ 10,211,426
Estimated Fair Value	$ 10,811,758	$ 10,129,917
% of Total	55.20%	57.20%
Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 1,956,380	$ 1,955,290
Estimated Fair Value	$ 2,153,490	$ 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	$ 7,284	$ 7,284	$ 7,284	$ 7,284
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	(310)	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	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 198,552	$ 627,451
% of Total	100.00%	100.00%
Less than 20%
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 150,638	$ 463,109
% of Total	75.80%	73.80%
20% or more for less than six months
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 8,933	$ 142,495
% of Total	4.50%	22.70%
20% or more for six months or greater
Gross unrealized losses with number of securities [Line Items]
Gross Unrealized Losses	$ 38,981	$ 21,847
% of Total	19.70%	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	Jun. 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	$ 1,728,972	$ 10,578,982
Gross Unrealized Losses - Less than 12 months	53,258	513,764
Estimated Fair Value - 12 months or greater	2,169,909	822,840
Gross Unrealized Losses - 12 months or greater	136,912	105,483
Estimated Fair Value	3,898,881	11,401,822
Gross Unrealized Losses	190,170	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	3,248	50,658
Gross Unrealized Losses - Less than 12 months	261	4,417
Estimated Fair Value - 12 months or greater	30,853	12,191
Gross Unrealized Losses - 12 months or greater	8,121	3,787
Estimated Fair Value	34,101	62,849
Gross Unrealized Losses	8,382	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	291,016	648,027
Gross Unrealized Losses - Less than 12 months	15,218	79,258
Estimated Fair Value - 12 months or greater	403,790	163,901
Gross Unrealized Losses - 12 months or greater	53,136	44,544
Estimated Fair Value	694,806	811,928
Gross Unrealized Losses	68,354	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	1,437,956	9,930,955
Gross Unrealized Losses - Less than 12 months	38,040	434,506
Estimated Fair Value - 12 months or greater	1,766,119	658,939
Gross Unrealized Losses - 12 months or greater	83,776	60,939
Estimated Fair Value	3,204,075	10,589,894
Gross Unrealized Losses	121,816	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	282,830	554,688
Gross Unrealized Losses - Less than 12 months	14,077	71,171
Estimated Fair Value - 12 months or greater	335,351	114,427
Gross Unrealized Losses - 12 months or greater	45,761	31,076
Estimated Fair Value	618,181	669,115
Gross Unrealized Losses	59,838	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	649,275	6,388,148
Gross Unrealized Losses - Less than 12 months	15,424	323,961
Estimated Fair Value - 12 months or greater	1,208,939	294,755
Gross Unrealized Losses - 12 months or greater	59,206	40,861
Estimated Fair Value	1,858,214	6,682,903
Gross Unrealized Losses	74,630	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	379	7,679
Gross Unrealized Losses - 12 months or greater	11	298
Estimated Fair Value	379	30,325
Gross Unrealized Losses	11	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	67,472	452,297
Gross Unrealized Losses - Less than 12 months	1,672	7,036
Estimated Fair Value - 12 months or greater	120,431	82,314
Gross Unrealized Losses - 12 months or greater	3,990	4,057
Estimated Fair Value	187,903	534,611
Gross Unrealized Losses	5,662	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	1,118	201
Estimated Fair Value - 12 months or greater	8,623	9,335
Gross Unrealized Losses - 12 months or greater	1,545	1,250
Estimated Fair Value	14,481	16,107
Gross Unrealized Losses	2,663	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	534,180	581,701
Gross Unrealized Losses - Less than 12 months	18,943	9,825
Estimated Fair Value - 12 months or greater	258,828	199,298
Gross Unrealized Losses - 12 months or greater	10,507	7,100
Estimated Fair Value	793,008	780,999
Gross Unrealized Losses	29,450	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	78,002	514,877
Gross Unrealized Losses - Less than 12 months	423	9,806
Estimated Fair Value - 12 months or greater	41,399	31,177
Gross Unrealized Losses - 12 months or greater	702	997
Estimated Fair Value	119,401	546,054
Gross Unrealized Losses	1,125	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		1,010,387
Gross Unrealized Losses - Less than 12 months		57,718
Estimated Fair Value - 12 months or greater		0
Gross Unrealized Losses - 12 months or greater		0
Estimated Fair Value		1,010,387
Gross Unrealized Losses		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	9,697	157,837
Gross Unrealized Losses - Less than 12 months	443	5,349
Estimated Fair Value - 12 months or greater	56,930	13,016
Gross Unrealized Losses - 12 months or greater	5,694	3,718
Estimated Fair Value	66,627	170,853
Gross Unrealized Losses	6,137	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	2,328	60,668
Gross Unrealized Losses - Less than 12 months	23	7,356
Estimated Fair Value - 12 months or greater	59,437	31,693
Gross Unrealized Losses - 12 months or greater	5,819	11,803
Estimated Fair Value	61,765	92,361
Gross Unrealized Losses	5,842	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	99,330	702,962
Gross Unrealized Losses - Less than 12 months	1,135	18,279
Estimated Fair Value - 12 months or greater	79,592	38,379
Gross Unrealized Losses - 12 months or greater	3,677	4,206
Estimated Fair Value	178,922	741,341
Gross Unrealized Losses	4,812	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	3,248	12,331
Gross Unrealized Losses - Less than 12 months	261	2,175
Estimated Fair Value - 12 months or greater	24,247	12,191
Gross Unrealized Losses - 12 months or greater	7,675	3,787
Estimated Fair Value	27,495	24,522
Gross Unrealized Losses	7,936	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	0	38,327
Gross Unrealized Losses - Less than 12 months	0	2,242
Estimated Fair Value - 12 months or greater	6,606	0
Gross Unrealized Losses - 12 months or greater	446	0
Estimated Fair Value	6,606	38,327
Gross Unrealized Losses	$ 446	$ 2,242

Investments (Investment Income

Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 525,229	$ 467,718	$ 960,349	$ 911,280
Investment expense	(17,563)	(17,179)	(35,417)	(33,850)
Investment income, net of related expenses	507,666	450,539	924,932	877,430
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	323,592	303,792	636,007	573,560
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	41,900	37,121	81,692	71,893
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	16,372	16,248	32,506	30,288
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	112,893	87,325	168,873	199,585
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	985	814	1,960	1,509
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 29,487	$ 22,418	$ 39,311	$ 34,445

Investments (Investment Related

Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investment Gains And Losses [Abstract]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 846	$ 4,137	$ 34,663	$ 6,664
Gain on investment activity	(53,615)	(20,009)	(80,807)	(39,210)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	(22,556)	(14,475)	(34,343)	(28,071)
Other impairment losses and change in mortgage loan provision	211	143	(1,849)	(4,025)
Derivatives and other, net	87,840	(17,718)	(12,574)	(9,045)
Total investment related gains (losses), net	$ 118,264	$ (16,178)	$ (2,622)	$ (8,595)

Investments (Borrowed Securitie

Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities for Reverse Repurchase Agreements	$ 448,615	$ 443,435
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	485,826	481,197
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	269,740	259,540
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	289,454	266,297
Securities for Reverse Repurchase Agreements	$ 480,618	$ 465,889

Investments (Securities Pledged

Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	$ 480,618	$ 465,889
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	485,826	481,197
SecuredBorrowingsGrossDifferenceAmount	5,208	15,308
Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	146,865	150,275
Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	101,715	97,639
US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	212,918	199,431
Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	14,524	3,358
Other Debt Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	4,596	15,186
Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	4,596	15,186
Maturity Overnight [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
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	4,596	15,186
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	5,329	2,951
Maturity up to 30 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	5,329	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	4,031	0
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	4,031	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	0	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	466,662	447,752
Maturity over 90 days [Member] | Corporate Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	137,505	147,324
Maturity over 90 days [Member] | Residential Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	101,715	97,639
Maturity over 90 days [Member] | US Treasury and Government [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	212,918	199,431
Maturity over 90 days [Member] | Foreign Government Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	14,524	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	Jun. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 3,383,538	$ 3,136,764
Percentage of total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 397,719	$ 420,014
Percentage of total	11.80%	13.40%
Retail
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 1,033,538	$ 1,026,018
Percentage of total	30.50%	32.70%
Office building
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 1,057,245	$ 980,858
Percentage of total	31.30%	31.30%
Industrial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 708,764	$ 527,485
Percentage of total	20.90%	16.80%
Other commercial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 186,272	$ 182,389
Percentage of total	5.50%	5.80%

Investments (Mortgage Loans b52

Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 3,383,538	$ 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	$ 768,747	$ 873,280
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	22.70%	27.80%
Due after five years through ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,800,601	$ 1,561,535
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	53.20%	49.80%
Due after ten years
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 814,190	$ 701,949
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	24.10%	22.40%

Investments (Mortgage Loans b53

Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 3,383,538	$ 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	$ 1,904,494	$ 1,621,601
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	56.30%	51.70%
Investment grade
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,396,572	$ 1,397,996
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	41.30%	44.60%
Average
Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 39,444	$ 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	$ 36,035	$ 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	$ 6,993	$ 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	Jun. 30, 2016	Dec. 31, 2015
Mortgage Loans:
Total mortgage loans	$ 3,383,538	$ 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)	3,377,039	3,129,951
Commercial Real Estate Portfolio Segment [Member]
Mortgage Loans:
Evaluated individually for credit losses	6,993	16,421
Evaluated collectively for credit losses	3,376,545	3,120,343
Total mortgage loans	3,383,538	3,136,764
Valuation Allowances:
Specific for credit losses	0	588
Non-specifically identified credit losses	6,499	6,225
Total valuation allowances	$ 6,499	$ 6,813

Investments (Loan Valuation All

Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 6,824	$ 6,130	$ 6,813	$ 6,471
Provision (release)	(325)	(188)	(314)	(529)
Balance, End of Period	$ 6,499	$ 5,942	$ 6,499	$ 5,942

Investments (Impaired Mortgage

Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 7,495		$ 7,495		$ 16,931
Recorded Investment		6,993		6,993		16,421
Related Allowance		0		0		588
Carrying Value		6,993		6,993		15,833
Average Investment	[1]	8,625	$ 16,921	11,224	$ 16,956
Interest Income		107	264	216	525
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]	4,724	11,397	7,279	11,036
Interest Income		0	229	0	384
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		7,495		7,495		4,033
Recorded Investment		6,993		6,993		4,033
Related Allowance		0		0		0
Carrying Value		6,993		6,993		$ 4,033
Average Investment	[1]	3,901	5,524	3,945	5,920
Interest Income		$ 107	$ 35	$ 216	$ 141
[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	Jun. 30, 2016	Dec. 31, 2015
Other invested assets	$ 1,682,143	$ 1,298,120
Equity securities
Other invested assets	418,186	125,862
Limited Partner [Member]
Other invested assets	635,574	567,697
Derivatives
Other invested assets	310,796	256,178
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other invested assets	195,842	197,547
Other
Other invested assets	$ 121,745	$ 150,836

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)securities	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)securities	Jun. 30, 2015USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)securities	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Investment Narrative [Line Items]
Proceeds From Sale Of Available For Sale Securities Sold At Loss	$ 343,300	$ 651,300	$ 585,800	$ 850,900
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments	22,556	14,475	34,343	28,071
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	6,974	7,284	6,974	7,284	$ 7,284	$ 7,284	$ 7,284	$ 7,284
Financing Receivable, Recorded Investment, Past Due	$ 0		$ 0			$ 0
Policy Loans Percent Of Total Investments	3.20%		3.20%			3.50%
Mortgage Loan To Value Ratio on Approval			75.00%
Mortgage Loan Percent Of Cash And Invested Assets	7.40%		7.40%			7.50%
Available-for-sale Securities, Gross Realized Gains	$ 53,615	$ 20,009	$ 80,807	$ 39,210
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities	908		908			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	12.90%		12.90%			14.00%
Funds withheld at interest	$ 5,899,289		$ 5,899,289			$ 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	3.70%		3.70%			3.10%
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	24.10%		24.10%			22.30%

Derivative Instruments (Gross N

Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 13,624,528	$ 11,928,989
Carrying Value / Fair Value of Assets	360,834	301,270
Derivative Liability, Fair Value, Gross Liability	1,274,394	1,202,203
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	12,280,004	10,985,503
Carrying Value / Fair Value of Assets	258,428	155,005
Derivative Liability, Fair Value, Gross Liability	1,228,973	1,172,217
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,118,523	1,123,057
Carrying Value / Fair Value of Assets	175,987	85,075
Derivative Liability, Fair Value, Gross Liability	970	4,196
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	508,310	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	43,000	45,000
Carrying Value / Fair Value of Assets	1,703	44
Derivative Liability, Fair Value, Gross Liability	2,732	6,768
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	29,208	28,561
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	613	292
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	865,000	897,000
Carrying Value / Fair Value of Assets	8,635	8,230
Derivative Liability, Fair Value, Gross Liability	5,300	11,053
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	541,749	453,435
Carrying Value / Fair Value of Assets	54,322	46,653
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Longevity Swap [Member]
Derivative [Line Items]
Notional Amount	888,480	868,960
Carrying Value / Fair Value of Assets	17,781	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	1,997	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	91,981	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	841,832	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	283,548	192,470
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	8,235,734	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	1,344,524	943,486
Carrying Value / Fair Value of Assets	102,406	146,265
Derivative Liability, Fair Value, Gross Liability	45,421	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	42,038	29,986
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	909,524	823,486
Carrying Value / Fair Value of Assets	102,406	146,265
Derivative Liability, Fair Value, Gross Liability	$ 3,383	$ 0

Derivative Instruments (Derivat

Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 360,834	$ 301,270
Gross Amounts Offset in the Balance Sheet		(32,257)	(30,096)
Net Amounts Presented in the Balance Sheet		328,577	271,174
Derivative Asset, Fair Value of Collateral	[1]	(40,876)	(20,888)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[2]	(298,459)	(245,038)
Net Amount		(10,758)	5,248
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		57,033	54,921
Gross Amounts Offset in the Balance Sheet		(32,257)	(30,096)
Net Amounts Presented in the Balance Sheet		24,776	24,825
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	[3]	(74,538)	(47,149)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	[4]	(16,822)	(12,540)
Net Amount		$ (66,584)	$ (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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ (3,755)	$ 2,112
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	3,755	(2,112)
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				6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 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	$ 41,192	$ 21,794	$ 23,901	$ 30,598	$ 41,192	$ 23,901	$ 29,397	$ 31,591
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(20,350)		8,735		(11,799)	8,948
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(58)		(543)		(165)	(603)
Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 1,010		$ (1,495)		$ 169	$ (655)

Derivative Instruments (Cash Fl

Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 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	$ (20,350)		$ 8,735		$ (11,799)	$ 8,948
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(41,192)	$ (21,794)	(23,901)	$ (30,598)	(41,192)	(23,901)	$ (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	(1,010)		1,495		(169)	655
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	58		543		165	603
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(20,350)		2,417		(11,799)	(5,150)
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	93		231		253	291
Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0		6,318		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	(1,010)		1,495		(169)	655
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	$ (35)		$ 312		$ (88)	$ 312

Derivative Instruments (Hedges

Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	[1],[2]	$ 302	$ (12,945)	$ (31,493)	$ 37,021
[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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 118,264	$ (16,178)	$ (2,622)	$ (8,595)
Policy acquisition costs and other insurance expenses	(405,681)	(300,412)	(639,444)	(577,455)
Interest credited	(95,849)	(77,246)	(183,754)	(197,924)
Other revenues	66,193	66,936	125,376	129,223
Not Designated as Hedging Instrument
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	87,543	(10,677)	(12,151)	(46,531)
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	41,500	(41,729)	104,027	(12,385)
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	(7,557)	(2,183)	(18,608)	(9,514)
Not Designated as Hedging Instrument | Foreign Currency Forwards
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	3,577	(1,433)	6,077	(1,653)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(520)	168	(700)	97
Not Designated as Hedging Instrument | Credit Default Swaps
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	3,518	(187)	6,864	2,471
Not Designated as Hedging Instrument | Equity Options
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(3,225)	(2,606)	(5,928)	(10,672)
Not Designated as Hedging Instrument | Longevity Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	2,394	1,911	2,481	3,731
Not Designated as Hedging Instrument | Mortality Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Other revenues	1,046	(478)	622	(957)
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	76,966	(23,098)	(15,283)	(25,423)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Interest credited	2,019	8,080	(626)	(21,246)
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	$ (28,137)	$ 50,878	$ (91,077)	$ 25,745

Derivative Instruments (Exposur

Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 2,820	$ (4,003)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 861,700	$ 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]	$ 851	$ 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 151,500	$ 152,500
Derivative Average Remaining Maturity	[1],[3]	4 years 2 months	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]	851	1,689
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 151,500	$ 152,500
Derivative Average Remaining Maturity	[1],[3]	4 years 2 months	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]	$ (2,451)	$ (5,066)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 289,200	$ 315,200
Derivative Average Remaining Maturity	[1],[3]	4 years 2 months	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]	$ 4,554	$ 2,274
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 416,000	$ 416,000
Derivative Average Remaining Maturity	[1],[3]	5 years	5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 2,103	$ (2,792)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 705,200	$ 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]	3 years 2 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]	$ (134)	$ (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]	(134)	(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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	$ 118,264	$ (16,178)	$ (2,622)	$ (8,595)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	40,733	(46,537)	94,835	(25,607)
Total benefits and expenses	2,685,845	2,416,550	5,090,833	4,753,038
Net income	236,103	130,391	312,575	255,505
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	76,966	(23,098)	(15,283)	(25,423)
Net income	18,807	(3,917)	(7,970)	(6,504)
Embedded Derivatives In Equity Indexed Annuities [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total benefits and expenses	(2,019)	8,080	(626)	(21,246)
Net income	(7,816)	1,233	3,418	(14,766)
Embedded Derivatives In Variable Annuity Contracts [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	(28,137)	50,878	(91,077)	25,745
Net income	$ (40,167)	$ 19,608	$ (66,010)	$ 10,198

Derivative Instruments (Credit

Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Credit Exposure of Derivative Contracts
Estimated fair value of derivatives in net asset (liability) position		$ 305,798	$ 248,968
Derivative, Collateral, Right to Reclaim Cash	[1]	16,822	12,540
Derivative Liability, Fair Value of Collateral	[2]	74,538	47,149
Derivative, Collateral, Obligation to Return Cash	[3]	(298,459)	(245,038)
Derivative Asset, Fair Value of Collateral	[4]	(40,876)	(20,888)
Deposits with Clearing Organizations and Others, Securities	[2]	(62,577)	(34,898)
Net credit exposure		(4,754)	7,833
Margin account related to exchange-traded futures	[5]	$ 10,503	$ 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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	$ 2.4	$ 7
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	0.5	0.5
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	$ 140.4	$ 140.4	$ 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	Jun. 30, 2016	Dec. 31, 2015
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 33,160,976	$ 29,642,905
Funds withheld at interest embedded derivatives	(91,981)	(76,698)
Cash and cash equivalents	213,556	406,521
Short-term investments	160,901	530,773
Investments, Fair Value Disclosure	925,758	587,757
Other Assets, Fair Value Disclosure	17,781	14,996
Assets, Fair Value Disclosure, Recurring	34,386,991	31,106,254
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	1,125,380	1,070,584
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	1,150,156	1,095,409
Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	61,103	87,520
Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	357,083	38,342
Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	934	8,170
Interest Rate Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	159,611	71,882
Liabilities Fair Value Disclosure
Other liabilities	26,632	20,989
Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	1,498
Other Assets, Fair Value Disclosure		20
Liabilities Fair Value Disclosure
Other liabilities	2,527	6,744
Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(613)	(292)
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	195,842	197,547
Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	5,625	2,567
Liabilities Fair Value Disclosure
Other liabilities	2,290	5,390
Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	43,543	40,644
Liabilities Fair Value Disclosure
Other liabilities	(10,779)	(6,009)
Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	101,132	141,357
Liabilities Fair Value Disclosure
Other liabilities	2,109	(4,908)
Mortality Swap [Member]
Liabilities Fair Value Disclosure
Other liabilities	1,997	2,619
Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	19,543,237	17,708,156
Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,105,274	3,576,759
Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,292,778	1,311,477
Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,356,677	1,212,676
Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,507,693	1,483,087
US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,007,338	1,381,659
US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	605,942	511,014
Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,742,037	2,458,077
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,416,659	1,757,449
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	213,556	406,521
Short-term investments	133,716	524,946
Investments, Fair Value Disclosure	600,651	323,638
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	3,364,582	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	48,030	81,809
Fair Value Inputs Level 1 Member | Other equity securities
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	357,083	38,342
Fair Value Inputs Level 1 Member | Other
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	934	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
Investments, Fair Value Disclosure	0
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	194,604	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	252,082	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	1,874,944	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	289,633	260,552
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	28,314,806	25,460,690
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	0	0
Short-term investments	27,185	5,827
Investments, Fair Value Disclosure	325,107	264,119
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure, Recurring	28,667,098	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	22,779	22,206
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	13,073	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	159,611	71,882
Liabilities Fair Value Disclosure
Other liabilities	26,632	20,989
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	1,498
Other Assets, Fair Value Disclosure		20
Liabilities Fair Value Disclosure
Other liabilities	2,527	6,744
Fair Value Inputs Level 2 Member | Consumer Price Index Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	(613)	(292)
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	1,238	2,230
Fair Value Inputs Level 2 Member | Credit Default Swaps
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	5,625	2,567
Liabilities Fair Value Disclosure
Other liabilities	2,290	5,390
Fair Value Inputs Level 2 Member | Equity Option [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	43,543	40,644
Liabilities Fair Value Disclosure
Other liabilities	(10,779)	(6,009)
Fair Value Inputs Level 2 Member | Currency Swap [Member]
Assets Fair Value Disclosure
Investments, Fair Value Disclosure	101,132	141,357
Liabilities Fair Value Disclosure
Other liabilities	2,109	(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	17,993,773	16,212,147
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,551,082	3,160,683
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,126,799	980,828
Fair Value Inputs Level 2 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,057,861	908,840
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,469,758	1,414,524
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	106,139	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	570,696	472,672
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,438,698	2,183,460
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,429,511	2,424,766
Funds withheld at interest embedded derivatives	(91,981)	(76,698)
Cash and cash equivalents	0	0
Short-term investments	0	0
Investments, Fair Value Disclosure	0	0
Other Assets, Fair Value Disclosure	17,781	14,996
Assets, Fair Value Disclosure, Recurring	2,355,311	2,363,064
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives	1,125,380	1,070,584
Liabilities Fair Value Disclosure
Liabilities, Fair Value Disclosure, Recurring	1,127,377	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
Investments, Fair Value Disclosure	0
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	1,997	2,619
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,297,382	1,226,970
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	554,192	416,076
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	165,979	330,649
Fair Value Inputs Level 3 Member | Asset-backed securities
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	298,816	303,836
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	37,935	68,563
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	26,255	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	35,246	38,342
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 13,706	$ 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	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Percentage Of Fixed Maturity Securities Classified As Level 3	7.30%	8.20%
Corporate Debt Securities [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 167,602	$ 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	$ 17,781	$ 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	$ 4,941	$ 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	$ 841,832	$ 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	$ 283,548	$ 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	7.00%	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	$ 1,997	$ 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	$ 91,981	$ 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	$ 26,255	$ 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	0	0	625
Fair Value, Equity, Level 2 to Level 1 Transfers, Description	0	31,896	0	36,996

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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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		$ 13,706	$ 14,657	$ 13,706	$ 14,657
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		(168,948)	19,769	(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		(91,981)	(3,329)	(91,981)	(3,329)
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		76,967	(23,098)	(15,283)	(25,423)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		76,967	(23,098)	(15,283)	(25,423)
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
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
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			7,992		7,904
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(104)		(16)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]		(4,500)		(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			12,388		12,388
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] | 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
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
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		15,806	8,602	14,996	7,727
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(419)	340	304	(605)
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		17,781	10,853	17,781	10,853
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	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	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	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
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
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		2,394	1,911	2,481	3,731
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		2,394	1,911	2,481	3,731
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		(1,118,069)	(1,132,271)	(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]	4,703	13,924	2,035	25,568
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]	18,142	18,083	34,872	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0	0	0	37,081
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3		0	0	0	0
Fair Value, end of period		(1,125,380)	(1,069,154)	(1,125,380)	(1,069,154)
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		(28,137)	50,878	(91,077)	25,745
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(31,333)	48,603	(96,811)	20,358
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		2,019	(8,080)	626
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		20,162	10,003	35,497	58,327
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					21,246
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		3,043	1,276	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]	0	0	0	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		(1,997)	(1,754)	(1,997)	(1,754)
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] | 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
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
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		(1,046)	478	(622)	957
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(1,046)	478	(622)	957
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		1,243,660	1,286,979	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)		30,391	(16,902)	56,073	(10,833)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(72,982)	(76,982)	(140,578)	(113,882)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(901)	(3,949)	(10,483)	(3,949)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(47,461)	(103,696)	(96,955)	(163,296)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		5,023	413	10,206	413
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(5,732)	(1,293)	(5,732)	(6,902)
Fair Value, end of period		1,297,382	1,237,317	1,297,382	1,237,317
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		(592)	(1,051)	(1,419)	(1,854)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(608)	(997)	(1,428)	(1,800)
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		12	(166)	(21,856)	(571)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	(21,726)	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] | Canadian Provincial Governments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		487,383		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)		63,760		132,065
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		554,192		554,192
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		3,049		6,051
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		3,049		6,051
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] | 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] | Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		333,253	192,579	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)		3,839	(1,291)	(493)	(768)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(42,913)	(118,868)	(72,228)	(130,307)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(167,236)	0	(167,684)	(714)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(13,464)	(8,617)	(24,904)	(14,336)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	1,800	0	2,400
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(31,551)	(4,824)	(41,524)	(6,246)
Fair Value, end of period		165,979	298,376	165,979	298,376
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		116	(156)	(371)	(296)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		530	(156)	42	(297)
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		(1,891)	17	(1,922)	(65)
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 | 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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		285,220	609,436	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)		2,793	(301)	(7,734)	3,331
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(59,779)	(44,181)	(97,050)	(85,172)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(30,181)	(1,615)	(38,681)	(8,971)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(4,196)	(63,751)	(7,921)	(67,873)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		18,398	0	24,796	9,055
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(34,072)	(9,234)	(74,057)	(16,450)
Fair Value, end of period		298,816	580,510	298,816	580,510
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		252	1,511	426	2,930
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		187	706	350	2,105
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		823	283	1,101	356
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0	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] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		63,574	93,869	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)		453	(386)	(2,359)	(696)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	0	(42)	(1,545)	(42)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	[1]	(22,338)	(2,000)	(25,976)	(2,956)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	[1]	(68)	(893)	(137)	(6,013)
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		(1,507)	(12,720)	(1,545)	(12,720)
Fair Value, end of period		37,935	77,819	37,935	77,819
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		490	677	1,133	1,271
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		485	640	1,031	1,229
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		(2,669)	(770)	(3,289)	(683)
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] | 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]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		25,880	27,756	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)		461	(559)	1,057	(383)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	[1]	(144)	(154)	(257)	(275)
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]	(108)	(94)	(1,079)	(1,038)
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		26,255	27,359	26,255	27,359
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)	112	(245)	93
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(122)	112	(245)	93
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	(10)	0	(117)
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] | 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 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		34,624	41,875	38,342	42,711
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		837	(1,480)	1,171	(1,455)
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]	(227)	(212)	(258)	(241)
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	(4,204)	(835)
Fair Value, end of period		35,246	40,186	35,246	40,186
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		12	8	195	15
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		12	8	195	15
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	(9)
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, 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] | 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
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		13,936	15,202	14,065	19,663
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		95	(232)	288	(50)
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]	(325)	(313)	(647)	(623)
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] | 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
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
[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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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]			$ 6,993	$ 5,850
Fair Value Assets Gains Losses	[1]	$ (400)	$ (11)	(702)	39
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	13,667
Fair Value Assets Gains Losses	[2]	$ (112)	$ 0	$ (2,039)	$ (4,509)
[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		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets
Mortgage loans on real estate (net of valuation allowances)		$ 3,377,039	$ 3,129,951
Policy loans		1,445,410	1,468,796
Funds withheld at interest		5,899,289	5,880,203
Cash and cash equivalents		1,034,329	1,525,275	$ 1,335,661	$ 1,645,669
Short-term investments		195,979	558,284
Other invested assets		1,682,143	1,298,120
Accrued investment income		368,926	339,452
Liabilities
Interest-sensitive contract liabilities		14,024,012	13,663,873
Short-term Debt		299,807	0
Long-term debt		2,788,473	2,297,548
Collateral finance and securitization notes		870,482	899,161
Reported Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		3,377,039	3,129,951
Policy loans		1,445,410	1,468,796
Funds withheld at interest	[1]	5,987,794	5,956,380
Cash and cash equivalents	[2]	820,773	1,118,754
Short-term investments	[2]	35,078	27,511
Other invested assets	[2]	383,295	399,799
Accrued investment income		368,926	339,452
Liabilities
Interest-sensitive contract liabilities	[1]	10,058,118	9,746,870
Short-term Debt		299,807
Long-term debt		2,788,473
Debt, Long-term and Short-term, Combined Amount			2,297,548
Collateral finance and securitization notes		870,482	899,161
Estimate of Fair Value Measurement [Member]
Assets
Mortgage loans on real estate (net of valuation allowances)		3,502,098	3,197,808
Policy loans		1,445,410	1,468,796
Funds withheld at interest	[1]	6,368,471	6,311,780
Cash and cash equivalents	[2]	820,773	1,118,754
Short-term investments	[2]	35,078	27,511
Other invested assets	[2]	409,054	444,342
Accrued investment income		368,926	339,452
Liabilities
Interest-sensitive contract liabilities	[1]	10,650,840	9,841,576
Short-term Debt, Fair Value		308,457
Long-term Debt, Fair Value		2,954,981
Debt, Long-term and Short-term, Combined Amount			2,415,119
Collateral finance and securitization notes		790,304	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]	282,514	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]	820,773	1,118,754
Short-term investments	[2]	35,078	27,511
Other invested assets	[2]	4,297	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		1,445,410	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]	36,151	34,886
Accrued investment income		368,926	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)		3,502,098	3,197,808
Policy loans		0	0
Funds withheld at interest	[1]	6,368,471	6,311,780
Cash and cash equivalents	[2]	0	0
Short-term investments	[2]	0	0
Other invested assets	[2]	86,092	111,412
Accrued investment income		0	0
Liabilities
Interest-sensitive contract liabilities	[1]	10,650,840	9,841,576
Short-term Debt, Fair Value		308,457
Long-term Debt, Fair Value		2,954,981
Debt, Long-term and Short-term, Combined Amount			2,415,119
Collateral finance and securitization notes		$ 790,304	$ 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)	Jun. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Percentage Of Fixed Maturity Securities Classified As Level 3	7.30%	8.20%

Segment Information (Total Reve

Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 3,039,068	$ 2,630,340	$ 5,551,636	$ 5,150,953
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,799,080	1,534,023	3,238,802	2,981,986
CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	300,766	281,548	569,450	558,426
EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	382,619	359,500	740,009	710,108
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	494,616	418,390	908,886	831,835
Corporate and Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	61,987	36,879	94,489	68,598
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,494,003	1,342,248	2,894,820	2,597,538
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	288,912	270,090	546,912	535,094
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	301,642	284,192	591,276	579,424
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	477,571	411,314	871,770	805,189
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	305,077	191,775	343,982	384,448
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	11,854	11,458	22,538	23,332
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	80,977	75,308	148,733	130,684
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 17,045	$ 7,076	$ 37,116	$ 26,646

Segment Information (Income Los

Segment Information (Income Loss Before Provision for Income Tax of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ 353,223	$ 213,790	$ 460,803	$ 397,915
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	220,284	153,186	256,486	225,534
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	45,437	25,830	66,124	52,688
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	34,303	40,591	58,611	70,707
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	34,409	2,910	84,122	65,703
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	18,790	(8,727)	(4,540)	(16,717)
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	111,430	82,793	162,528	100,636
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	43,309	22,736	63,404	45,463
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	6,834	9,159	5,718	19,641
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	34,482	4,315	75,642	56,963
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	108,854	70,393	93,958	124,898
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	2,128	3,094	2,720	7,225
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	27,469	31,432	52,893	51,066
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	$ (73)	$ (1,405)	$ 8,480	$ 8,740

Segment Information (Total Asse

Segment Information (Total Assets of Reportable Segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 53,876,703	$ 50,383,152
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	31,742,036	29,960,387
CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,911,340	3,631,887
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,745,951	6,920,296
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,499,194	3,970,058
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,978,182	5,900,524
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	17,806,550	16,554,509
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,894,407	3,604,344
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,669,404	2,757,593
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,757,131	3,227,530
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	13,935,486	13,405,878
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	16,933	27,543
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,076,547	4,162,703
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 742,063	$ 742,528

Commitments, Contingencies an80

Commitments, Contingencies and Guarantees (Commitments to Fund Investments) (Details) - USD ($) $ in Thousands	Jun. 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	$ 252,864	$ 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	56,139	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	51,041	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	$ 40,091	$ 8,504

Commitments, Contingencies an81

Commitments, Contingencies and Guarantees (Maximum Potential Obligation) (Details) $ in Millions	Jun. 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	Jun. 30, 2016	Dec. 31, 2015
Insurance Treaty Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 759,175	$ 765,505
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	631,267	634,909
Guarantee Of Borrowed Securities [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	269,740	259,540
Product Financing Arrangement [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	121,369	100,000
Guarantee Of Lease Obligations [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 3,140	$ 5,217

Income Tax (Provision for Incom

Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 123,628	$ 74,826	$ 161,281	$ 139,270
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(8,398)	(764)	(12,282)	(6,285)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(5,553)	(6,931)	(14,489)	(13,601)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,288	4,967	9,287	11,758
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	3,288	952	3,889	1,905
Income Tax Reconciliation SubpartF	738	11,452	1,433	17,886
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(427)	(1,104)	(721)	(3,448)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(442)	(212)	(316)	(4,977)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(2)	213	146	(98)
Income Tax Expense (Benefit)	$ 117,120	$ 83,399	$ 148,228	$ 142,410
Effective Income Tax Rate Reconciliation, Percent	33.20%	39.00%	32.20%	35.80%

Employee Benefit Plans (Defined

Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,652	$ 2,586	$ 4,958	$ 4,616
Interest cost	1,076	1,283	2,335	2,526
Expected return on plan assets	(1,345)	(1,331)	(2,569)	(2,449)
Amortization of prior service cost	75	80	153	163
Amortization of prior actuarial loss	1,224	833	2,081	1,272
Total	3,682	3,451	6,958	6,128
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,015	589	2,031	1,178
Interest cost	643	491	1,286	982
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	617	265	1,233	530
Total	$ 2,275	$ 1,345	$ 4,550	$ 2,690

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Contributions by Employer	$ 4
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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 7.4	$ 3.1
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)	1,800,000
Options exercisable, weighted average price (per share)	$ 56.13
Options, remaining term	4 years 8 months
Compensation cost not yet recognized	$ 40.7
Period for recognition	2 years 1 month

Reinsurance (Ceded Reinsurance

Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 681,425	$ 637,859
Reinsurance Recoverables, Percentage of Total	100.00%	100.00%
Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 113,780	$ 107,077
Reinsurance Recoverables, Percentage of Total	16.70%	16.80%
AM Best, A+ Rating [Member] | Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 233,016	$ 199,479
Reinsurance Recoverables, Percentage of Total	34.20%	31.30%
AM Best, A+ Rating [Member] | Reinsurer B [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 190,957	$ 179,522
Reinsurance Recoverables, Percentage of Total	28.00%	28.10%
AM Best, A+ Rating [Member] | Reinsurer C [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 68,727	$ 72,836
Reinsurance Recoverables, Percentage of Total	10.10%	11.40%
AM Best, A++ Rating [Member] | Reinsurer D [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 38,098	$ 41,807
Reinsurance Recoverables, Percentage of Total	5.60%	6.60%
AM Best, A Rating [Member] | Reinsurer E [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 36,847	$ 37,138
Reinsurance Recoverables, Percentage of Total	5.40%	5.80%

Reinsurance (Narrative) (Detail

Reinsurance (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance Claims Recoverables	$ 246.2	$ 233.7
Claims Recoverable From Retrocessionaires Past Due	$ 4.7	$ 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	6 Months Ended
	Jun. 30, 2016USD ($)
Debt Instrument [Line Items]
Debt Instrument, Offering Date	Jun. 1, 2016
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