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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | 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 December 31, 2015 and 2014 (dollars in thousands):
|  | December 31, 2015 |  | December 31, 2014
|  | 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 |  | $ | 1,123,057 |  |  | $ | 85,075 |  |  | $ | 4,196 |  |  | $ | 1,144,661 |  |  | $ | 93,783 |  |  | $ | 3,934 |
Interest rate options |  | — |  |  | — |  |  | — |  |  | 240,000 |  |  | 18,195 |  |  | — |
Financial futures |  | 420,665 |  |  | — |  |  | — |  |  | 275,983 |  |  | — |  |  | — |
Foreign currency forwards |  | 45,000 |  |  | 44 |  |  | 6,768 |  |  | 67,967 |  |  | 87 |  |  | 15,098 |
Consumer price index swaps |  | 28,561 |  |  | — |  |  | 292 |  |  | 41,938 |  |  | — |  |  | 561 |
Credit default swaps |  | 897,000 |  |  | 8,230 |  |  | 11,053 |  |  | 805,700 |  |  | 11,689 |  |  | 3,502 |
Equity options |  | 453,435 |  |  | 46,653 |  |  | — |  |  | 555,361 |  |  | 35,242 |  |  | — |
Longevity swaps |  | 868,960 |  |  | 15,003 |  |  | 7 |  |  | 450,000 |  |  | 7,727 |  |  | — |
Mortality swaps |  | 50,000 |  |  | — |  |  | 2,619 |  |  | 50,000 |  |  | — |  |  | 797 |
Synthetic guaranteed investment contracts |  | 7,098,825 |  |  | — |  |  | — |  |  | 6,500,942 |  |  | — |  |  | — |
Embedded derivatives in: |  |  |  |  |  |  |  |  |  |  |  |
Modified coinsurance or funds withheld arrangements |  | — |  |  | — |  |  | 76,698 |  |  | — |  |  | 22,094 |  |  | — |
Indexed annuity products |  | — |  |  | — |  |  | 878,114 |  |  | — |  |  | — |  |  | 925,887 |
Variable annuity products |  | — |  |  | — |  |  | 192,470 |  |  | — |  |  | — |  |  | 159,279 |
Total non-hedging derivatives |  | 10,985,503 |  |  | 155,005 |  |  | 1,172,217 |  |  | 10,132,552 |  |  | 188,817 |  |  | 1,109,058 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | 120,000 |  |  | — |  |  | 29,986 |  |  | 120,000 |  |  | — |  |  | 18,228 |
Foreign currency swaps |  | 823,486 |  |  | 146,265 |  |  | — |  |  | 676,972 |  |  | 70,906 |  |  | — |
Forward bond purchase commitments |  | — |  |  | — |  |  | — |  |  | 196,452 |  |  | 1,175 |  |  | 14,545 |
Total hedging derivatives |  | 943,486 |  |  | 146,265 |  |  | 29,986 |  |  | 993,424 |  |  | 72,081 |  |  | 32,773 |
Total derivatives |  | $ | 11,928,989 |  |  | $ | 301,270 |  |  | $ | 1,202,203 |  |  | $ | 11,125,976 |  |  | $ | 260,898 |  |  | $ | 1,141,831 |
Offsetting Assets [Table Text Block] |
|  |  |  |  |  |  |  | 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 |  | Cash Collateral Pledged/ Received |  | Net Amount
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 | )
December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | $ | 238,804 |  |  | $ | (14,111 | ) |  | $ | 224,693 |  |  | $ | (20,260 | ) |  | $ | (178,141 | ) |  | $ | 26,292 |
Derivative liabilities |  | 56,665 |  |  | (14,111 | ) |  | 42,554 |  |  | (47,222 | ) |  | — |  |  | (4,668 | )
Offsetting Liabilities [Table Text Block] |
|  |  |  |  |  |  |  | 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 |  | Cash Collateral Pledged/ Received |  | Net Amount
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 | )
December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | $ | 238,804 |  |  | $ | (14,111 | ) |  | $ | 224,693 |  |  | $ | (20,260 | ) |  | $ | (178,141 | ) |  | $ | 26,292 |
Derivative liabilities |  | 56,665 |  |  | (14,111 | ) |  | 42,554 |  |  | (47,222 | ) |  | — |  |  | (4,668 | )
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 December 31, 2015, 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)
Foreign currency swaps |  | Foreign-denominated fixed maturity securities |  | $ | 4,008 |  |  | $ | (4,008 | ) |  | $ | — |
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 consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the years ended December 31, 2015, 2014 and 2013 (dollars in thousands):
|  | Gain (Loss) Included in AOCI
Balance December 31, 2012 |  | $ | 403 |
Losses deferred in other comprehensive loss on the effective portion of cash flow hedges |  | (3,969 | )
Amounts reclassified to investment income |  | (1,012 | )
Balance December 31, 2013 |  | (4,578 | )
Losses deferred in other comprehensive loss on the effective portion of cash flow hedges |  | (25,801 | )
Amounts reclassified to investment income |  | (1,212 | )
Balance December 31, 2014 |  | (31,591 | )
Gains deferred in other comprehensive income on the effective portion of cash flow hedges |  | 2,676 |
Amounts reclassified to investment related gains (losses), net |  | 87 |
Amounts reclassified to investment income |  | (569 | )
Balance December 31, 2015 |  | $ | (29,397 | )
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 consolidated statements of income and the consolidated statements of stockholders’ equity for the years ended December 31, 2015, 2014 and 2013 (dollars in thousands):
|  | Effective Portion
Derivative Type |  | Gain (Loss) Recognized in OCI |  | Gain (Loss) Reclassified into Income from OCI
For the year ended December 31, 2015: |  |  |  | Investment Related Gains (Losses) |  | Investment Income
Interest rate swaps |  | $ | (11,422 | ) |  | $ | — |  |  | $ | 343 |
Forward bond purchase commitments |  | 14,098 |  |  | (87 | ) |  | 226 |
Total |  | $ | 2,676 |  |  | $ | (87 | ) |  | $ | 569 |
For the year ended December 31, 2014: |  |  |  |  |  |
Interest rate swaps |  | $ | (12,431 | ) |  | $ | — |  |  | $ | 1,212 |
Forward bond purchase commitments |  | (13,370 | ) |  | — |  |  | — |
Total |  | $ | (25,801 | ) |  | $ | — |  |  | $ | 1,212 |
For the year ended December 31, 2013: |  |  |  |  |  |
Interest rate swaps |  | $ | (3,969 | ) |  | $ | — |  |  | $ | 1,012 |
The following table presents the effective portion of derivatives in cash flow hedging relationships on the consolidated statements of income and the consolidated statements of stockholders’ equity for the years ended December 31, 2015, 2014 and 2013 (dollars in thousands):
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 years ended December 31, 2015, 2014 and 2013 (dollars in thousands):
|  | Derivative Gains (Losses) Deferred in AOCI
|  | For the year ended
Type of NIFO Hedge (1) (2) |  | 2015 |  | 2014 |  | 2013
Foreign currency swaps |  | $ | 96,019 |  |  | $ | 51,894 |  |  | $ | 40,347 |
(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.
Derivative Instruments Gain Loss By Income Statement Location [Table Text Block] | A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s consolidated statements of income for the years ended December 31, 2015, 2014 and 2013 is as follows (dollars in thousands):
|  |  |  | Gain (Loss) for the Years Ended December 31,
Type of Non-hedging Derivative |  | Income Statement Location of Gain (Loss) |  | 2015 |  | 2014 |  | 2013
Interest rate swaps |  | Investment related gains (losses), net |  | $ | 20,358 |  |  | $ | 94,848 |  |  | $ | (84,398 | )
Interest rate options |  | Investment related gains (losses), net |  | 3,275 |  |  | 15,641 |  |  | (11,518 | )
Financial futures |  | Investment related gains (losses), net |  | 319 |  |  | (9,550 | ) |  | (11,157 | )
Foreign currency forwards |  | Investment related gains (losses), net |  | (1,160 | ) |  | (8,691 | ) |  | (13,201 | )
Consumer price index swaps |  | Investment related gains (losses), net |  | (208 | ) |  | (344 | ) |  | (1,942 | )
Credit default swaps |  | Investment related gains (losses), net |  | (4,683 | ) |  | 3,938 |  |  | 24,188 |
Equity options |  | Investment related gains (losses), net |  | (16,899 | ) |  | (22,472 | ) |  | (79,230 | )
Longevity swaps |  | Other revenues |  | 8,228 |  |  | 8,088 |  |  | — |
Mortality swaps |  | Other revenues |  | (1,822 | ) |  | (797 | ) |  | — |
Subtotal |  |  |  | 7,408 |  |  | 80,661 |  |  | (177,258 | )
Embedded derivatives in: |  |  |  |  |  |  |  |
Modified coinsurance or funds withheld arrangements |  | Investment related gains (losses), net |  | (98,792 | ) |  | 198,365 |  |  | 70,177 |
Indexed annuity products |  | Interest credited |  | 19,440 |  |  | (104,844 | ) |  | (115,409 | )
Variable annuity products |  | Investment related gains (losses), net |  | (33,192 | ) |  | (129,224 | ) |  | 142,050 |
Total non-hedging derivatives |  |  |  | $ | (105,136 | ) |  | $ | 44,958 |  |  | $ | (80,440 | )
Disclosure Of Credit Derivatives [Table Text Block] | 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 December 31, 2015 and 2014 (dollars in thousands):
|  | 2015 |  | 2014
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)
AAA/AA/AA-/A+/A/A- |  |  |  |  |  |  |  |  |  |  |  |
Single name credit default swaps |  | $ | 1,689 |  |  | $ | 152,500 |  |  | 3.9 |  |  | $ | 1,498 |  |  | $ | 167,500 |  |  | 4.6 |
Credit default swaps referencing indices |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Subtotal |  | 1,689 |  |  | 152,500 |  |  | 3.9 |  |  | 1,498 |  |  | 167,500 |  |  | 4.6 |
BBB+/BBB/BBB- |  |  |  |  |  |  |  |  |  |  |  |
Single name credit default swaps |  | (5,066 | ) |  | 315,200 |  |  | 4.2 |  |  | 168 |  |  | 217,200 |  |  | 4.9 |
Credit default swaps referencing indices |  | 2,274 |  |  | 416,000 |  |  | 5.0 |  |  | 6,651 |  |  | 416,000 |  |  | 5.0 |
Subtotal |  | (2,792 | ) |  | 731,200 |  |  | 4.6 |  |  | 6,819 |  |  | 633,200 |  |  | 4.9 |
BB+/BB |  |  |  |  |  |  |  |  |  |  |  |
Single name credit default swaps |  | (2,900 | ) |  | 10,000 |  |  | 4.1 |  |  | (130 | ) |  | 5,000 |  |  | 4.5 |
Credit default swaps referencing indices |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Subtotal |  | (2,900 | ) |  | 10,000 |  |  | 4.1 |  |  | (130 | ) |  | 5,000 |  |  | 4.5 |
Total |  | $ | (4,003 | ) |  | $ | 893,700 |  |  | 4.5 |  |  | $ | 8,187 |  |  | $ | 805,700 |  |  | 4.9 |
(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 [Table Text Block] | The related gains (losses) and the effect on net income after amortization of DAC and income taxes for the years ended December 31, 2015, 2014 and 2013 are reflected in the following table (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
Embedded derivatives in modified coinsurance or funds withheld arrangements included in investment related gains |  | $ | 98,792 |  |  | $ | 198,365 |  |  | $ | 70,177 |
After the associated amortization of DAC and taxes, the related amounts included in net income |  | (26,025 | ) |  | 45,171 |  |  | 18,920 |
Embedded derivatives in variable annuity contracts included in investment related gains |  | (33,192 | ) |  | (129,224 | ) |  | 142,050 |
After the associated amortization of DAC and taxes, the related amounts included in net income |  | (29,008 | ) |  | 27,601 |  |  | 70,123 |
Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses |  | 19,440 |  |  | (104,844 | ) |  | (115,409 | )
After the associated amortization of DAC and taxes, the related amounts included in net income |  | 6,204 |  |  | (69,963 | ) |  | (106,792 | )
Credit Risk [Table Text Block] | 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 December 31, 2015 and 2014 is reflected in the following table (dollars in thousands):
|  | 2015 |  | 2014
Estimated fair value of derivatives in net asset position |  | $ | 248,968 |  |  | $ | 175,209 |
Cash provided as collateral(1) |  | 12,540 |  |  | — |
Securities pledged to counterparties as collateral(2) |  | 47,149 |  |  | 47,222 |
Cash pledged from counterparties as collateral(3) |  | (245,038 | ) |  | (178,141 | )
Securities pledged from counterparties as collateral(4) |  | (20,888 | ) |  | (20,260 | )
Initial margin for cleared derivatives |  | (34,898 | ) |  | (16,333 | )
Net credit exposure |  | $ | 7,833 |  |  | $ | 7,697 |
Margin account related to exchange-traded futures(5) |  | $ | 11,004 |  |  | $ | 7,976 |
(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 agency securities.
(5) | Included in other assets.

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- Definition Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4L -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5708777-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5708775-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5708773-113959 + Details
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- Definition Tabular disclosure for net investment hedges of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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