| **Derivative Financial Instruments**                                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Derivative Financial Instruments                                        | Derivative Financial Instruments Derivative transactions are generally entered into pursuant to International Swaps and Derivatives Association (“ISDA”) Master agreements or Master Securities Forward Transaction Agreements (“MSFTA”) with approved counterparties that provide for a single net payment to be made by one party to the other on a daily basis, periodic payment dates, or at the due date, expiration or termination of the agreement. The ISDA master agreements contain provisions that would allow the counterparties to require immediate settlement of all derivative instruments in a net liability position if the Company were to default on any debt obligations over a certain threshold.  The MSFTA contain provisions which do not stipulate a threshold for default and only apply to debt obligations between the Company and the specific counterparty.  The aggregate fair value, inclusive of accrued income and expense, of derivative instruments with credit-risk-related contingent features that were in a net liability position was $141,653 and $167,743 as of December 31, 2014 and 2013, respectively.  The Company had pledged collateral related to these derivatives of $106,110 and $143,540 as of December 31, 2014 and 2013, respectively, in the normal course of business.  If the credit-risk-related contingent features were triggered on December 31, 2014, the fair value of assets that could be required to settle the derivatives in a net liability position was $35,543. At December 31, 2014 and 2013, the Company had pledged $106,110 and $143,710, respectively, of unrestricted cash collateral to counterparties in the normal course of business. At December 31, 2014, the Company estimated $8,500 of net derivative gains related to cash flow hedges included in AOCI will be reclassified into net income within the next twelve months.  Gains and losses included in AOCI are reclassified into net income when the hedged item affects earnings. Types of derivative instruments and derivative strategies Interest rate contracts Cash flow hedges Interest rate swap agreements are used to convert the interest rate on certain debt securities from a floating rate to a fixed rate.  Interest rate futures are used to manage the interest rate risks of forecasted acquisitions of fixed rate maturity investments.  These derivatives are primarily structured to hedge interest rate risk inherent in the assumptions used to price certain liabilities. Fair value hedges Interest rate swap agreements are used to convert the interest rate on certain debt securities from a fixed rate to a floating rate to manage the interest rate risk of the change in the fair value of certain fixed rate maturity investments.   Not designated as hedging instruments The Company enters into certain transactions in which derivatives are hedging an economic risk but hedge accounting is not elected.  These derivative instruments include:  exchange-traded interest rate swap futures, OTC interest rate swaptions, OTC interest rate swaps, exchange-traded Eurodollar interest rate futures and treasury interest rate futures.  Certain of the Company’s OTC derivatives are cleared and settled through a central clearing counterparty while others are bilateral contracts between the Company and a counterparty. The derivative instruments mentioned above are economic hedges and used to manage risk.  These transactions are used to offset changes in liabilities including those in variable annuity products, hedge the economic effect of a large increase in interest rates, manage the potential variability in future interest payments due to a change in credited interest rates and the related change in cash flows due to increased surrenders and manage interest rate risks of forecasted acquisitions of fixed rate maturity investments and forecasted liability pricing.Cross-currency contracts Cross-currency swaps are used to manage the foreign currency exchange rate risk associated with investments denominated in other than U.S. dollars.  The Company uses cross-currency swaps to convert interest and principal payments on foreign denominated debt instruments into U.S. dollars.  Cross-currency swaps may be designated as cash flow hedges; however, hedge accounting is not always elected. Equity contracts Futures on equity indices are used to reduce the Company’s exposure to equity market risks; however, hedge accounting is not elected.  The Company is hedging the risk of declining equity market values having an adverse effect on fee income collected on equity funds. The Company also uses futures on equity indices to offset changes in guaranteed minimum withdrawal benefit liabilities. Other contracts The Company uses forward settling TBA securities to gain exposure to the investment risk and return of agency mortgage-backed securities (pass-throughs).  These transactions enhance the return on the Company’s investment portfolio and provide a more liquid and cost effective method of achieving these goals than purchasing or selling individual agency mortgage-backed pools.  As the Company does not regularly accept delivery of such securities, they are accounted for as derivatives but hedge accounting is not elected.  These transactions are disclosed as Other forward contracts.The following tables summarize derivative financial instruments:  December 31, 2014    Net derivatives Asset derivatives Liability derivatives  Notional amount Fair value (1) Fair value (1) Fair value (1)Hedge designation/derivative type:        Derivatives designated as hedges:        Cash flow hedges:        Interest rate swaps $184,200 $17,746 $17,746 $—Cross-currency swaps 174,245 2,322 5,143 2,821Total cash flow hedges 358,445 20,068 22,889 2,821         Fair value hedges:        Interest rate swaps 78,000 1,506 1,637 131Total fair value hedges 78,000 1,506 1,637 131         Total derivatives designated as hedges 436,445 21,574 24,526 2,952         Derivatives not designated as hedges:        Interest rate swaps 128,100 4,402 6,246 1,844Futures on equity indices 5,505 — — —Interest rate futures 17,958 — — —Interest rate swaptions 293,964 271 271 —Cross-currency swaps 662,935 (127,230) 4,561 131,791Total derivatives not designated as hedges 1,108,462 (122,557) 11,078 133,635Total derivative financial instruments $1,544,907 $(100,983) $35,604 $136,587 (1) The estimated fair value excludes accrued income and expense.  The estimated fair value of all derivatives in an asset position is reported within other assets and the estimated fair value of all derivatives in a liability position is reported within other liabilities in the consolidated balance sheets.  December 31, 2013    Net derivatives Asset derivatives Liability derivatives  Notional amount Fair value (1) Fair value (1) Fair value (1)Hedge designation/derivative type:        Derivatives designated as hedges:        Cash flow hedges:        Interest rate swaps $184,200 $13,829 $13,829 $—Cross-currency swaps 102,545 (7,843) — 7,843Total cash flow hedges 286,745 5,986 13,829 7,843         Fair value hedges:        Interest rate swaps 78,000 4,951 5,098 147Total fair value hedges 78,000 4,951 5,098 147         Total derivatives designated as hedges 364,745 10,937 18,927 7,990         Derivatives not designated as hedges:        Interest rate swaps 55,600 (2,038) 1,454 3,492Futures on equity indices 3,483 — — —Interest rate futures 16,233 — — —Interest rate swaptions 494,774 1,176 1,176 —Cross-currency swaps 557,676 (154,340) 1,921 156,261Total derivatives not designated as hedges 1,127,766 (155,202) 4,551 159,753Total derivative financial instruments $1,492,511 $(144,265) $23,478 $167,743 (1) The estimated fair value excludes accrued income and expense. The estimated fair value of all derivatives in an asset position is reported within other assets and the estimated fair value of all derivatives in a liability position is reported within other liabilities in the consolidated balance sheets. Notional amounts are used to express the extent of the Company’s involvement in derivative transactions and represent a standard measurement of the volume of its derivative activity.  Notional amounts represent those amounts used to calculate contractual flows to be exchanged and are not paid or received.  The average notional outstanding during the year ended December 31, 2014 was $340,262, $732,581, $21,702, $407,552, and $4,217,408 for interest rate swaps, cross-currency swaps,futures, swaptions and other forward contracts, respectively. The average notional outstanding during the year ended December 31, 2013 was $351,579, $608,787, $46,564, $606,374, and $3,543,173 for interest rate swaps, cross-currency swaps, futures,swaptions and other forward contracts, respectively. The following tables present the effect of derivative instruments in the consolidated statement of income reported by cash flow hedges, fair value hedges and economic hedges:  Gain (loss) recognizedin OCI on derivatives(Effective portion) Gain (loss) reclassified from OCIinto net income (Effective portion)   Year Ended December 31, Year Ended December 31,   2014 2013 2012 2014 2013 2012 Cash flow hedges:             Interest rate swaps $9,096 $(12,285) $5,220 $7,462 $5,067 $2,856(A)Cross-currency swaps 11,041 15,387 (24,101) 1,030 — —(A)Cross-currency swaps — — — (154) — —(B)Interest rate futures — — — 70 63 63(A)Total cash flow hedges $20,137 $3,102 $(18,881) $8,408 $5,130 $2,919 (A) Net investment income.(B) Represents realized gains (losses) on closed positions recorded in realized investment gains (losses), net.   Gain (loss) on derivativesrecognized in net income Gain (loss) on hedged assetsrecognized in net income   Year Ended December 31, Year Ended December 31,   2014 2013 2012 2014 2013 2012 Fair value hedges:             Interest rate swaps $(3,444) $6,342 $(380)(A)$— $— $— Interest rate swaps — 1,909 —(B)— — — Items hedged in interest rate swaps — — — 3,439 (5,308) 380(A)Items hedged in interest rate swaps — — — — (2,943) —(B)Total fair value hedges (1) $(3,444) $8,251 $(380) $3,439 $(8,251) $380  (1) Hedge ineffectiveness of ($5), zero and zero was recognized during the year ended December 31, 2014, 2013 and 2012, respectively.(A) Net investment income.(B) Represents realized gains (losses) on closed positions recorded in realized investment gains (losses), net.   Gain (loss) on derivatives recognized in net income   Year Ended December 31,   2014 2013 2012 Derivatives not designated as hedging instruments:       Futures on equity indices $(41)(A)$(97)(A)$2(A)Futures on equity indices (534)(B)(3,396)(B)(774)(B)Interest rate swaps 6,508(A)(3,668)(A)8,620(A)Interest rate swaps —(B)(622)(B)(4,979)(B)Interest rate futures (51)(A)(458)(A)164(A)Interest rate futures 305(B)303(B)(2,641)(B)Interest rate swaptions 2,424(A)3,241(A)862(A)Interest rate swaptions (3,578)(B)(2,828)(B)(1,827)(B)Other forward contracts 94,465(B)(57,442)(B)—(B)Cross-currency swaps 24,588(A)(50,111)(A)—(A)Total derivatives not designated as hedging instruments $124,086 $(115,078) $(573) (A) Net investment income.(B) Represents realized gains (losses) on closed positions recorded in realized investment gains (losses), net. |

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| - Definition
The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.
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