| **Summary of Investments**                             | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Investments, Debt and Equity Securities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| Summary of Investments                                 | Summary of Investments The following tables summarize fixed maturity investments classified as available-for-sale and the non-credit-related component of OTTI in AOCI:  December 31, 2014  Amortized Gross unrealized Gross unrealized Estimated fair value OTTI (gain) lossFixed maturities: cost gains losses and carrying value included in AOCI (1)U.S. government direct obligations and U.S. agencies $3,478,153 $70,597 $1,494 $3,547,256 $—Obligations of U.S. states and their subdivisions 1,885,715 287,668 899 2,172,484 —Foreign government securities 2,455 — 4 2,451 —Corporate debt securities (2) 11,258,517 763,036 82,104 11,939,449 (2,228)Asset-backed securities 1,263,089 149,152 13,702 1,398,539 (96,603)Residential mortgage-backed securities 167,793 7,368 1,932 173,229 (185)Commercial mortgage-backed securities 886,748 32,556 1,099 918,205 —Collateralized debt obligations 10,674 — 209 10,465 —Total fixed maturities $18,953,144 $1,310,377 $101,443 $20,162,078 $(99,016) (1) Indicates the amount of any OTTI (gain) loss included in AOCI that is included in gross unrealized gains and losses.  OTTI (gain) loss included in AOCI, as presented above, includes both the initial recognition of non-credit losses and the effects of subsequent increases and decreases in estimated fair value for those fixed maturity securities with previous non-credit impairment. The non-credit loss component of OTTI (gain) loss was in an unrealized gain position due to increases in estimated fair value subsequent to initial recognition of non-credit losses on such securities.(2) Includes perpetual debt investments with amortized cost of $157,742 and estimated fair value of $131,799.   December 31, 2013  Amortized Gross unrealized Gross unrealized Estimated fair value OTTI (gain) lossFixed maturities: cost gains losses and carrying value included in AOCI (1)U.S. government direct obligations and U.S. agencies $3,044,185 $43,827 $23,373 $3,064,639 $—Obligations of U.S. states and their subdivisions 1,763,797 196,742 16,952 1,943,587 —Foreign government securities 2,617 — 14 2,603 —Corporate debt securities (2) 10,454,252 568,261 223,532 10,798,981 (2,553)Asset-backed securities 1,553,510 131,277 29,150 1,655,637 (98,502)Residential mortgage-backed securities 244,723 8,335 3,473 249,585 (129)Commercial mortgage-backed securities 731,688 21,951 11,515 742,124 —Collateralized debt obligations 12,587 14 213 12,388 —Total fixed maturities $17,807,359 $970,407 $308,222 $18,469,544 $(101,184) (1) Indicates the amount of any OTTI (gain) loss included in AOCI that is included in gross unrealized gains and losses.  OTTI (gain) loss included in AOCI, as presented above, includes both the initial recognition of non-credit losses and the effects of subsequent increases and decreases in estimated fair value for those fixed maturity securities with previous non-credit impairment. The non-credit loss component of OTTI (gain) loss was in an unrealized gain position due to increases in estimated fair value subsequent to initial recognition of non-credit losses on such securities.(2) Includes perpetual debt investments with amortized cost of $172,054 and estimated fair value of $143,644. See Note 8 for additional discussion regarding fair value measurements. The amortized cost and estimated fair value of fixed maturity investments classified as available-for-sale, based on estimated cash flows, are shown in the table below.  Actual maturities will likely differ from these projections because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.   December 31, 2014  Amortized cost Estimated fair valueMaturing in one year or less $567,095 $595,521Maturing after one year through five years 3,583,929 3,887,276Maturing after five years through ten years 4,098,780 4,331,464Maturing after ten years 5,203,246 5,636,566Mortgage-backed and asset-backed securities 5,500,094 5,711,251Total fixed maturities $18,953,144 $20,162,078 Mortgage-backed (commercial and residential) and asset-backed securities include those issued by U.S. government and U.S. agencies. The following table summarizes information regarding the sales of securities classified as available-for-sale:   Year Ended December 31,  2014 2013 2012Proceeds from sales $2,705,999 $2,518,568 $2,697,809Gross realized gains from sales 47,852 71,758 113,984Gross realized losses from sales 1,229 27,792 4,371 Included in net investment income are unrealized gains (losses) of $3,119, $(9,447) and $(634) on held for trading fixed maturity investments still held at December 31, 2014, 2013 and 2012, respectively. Mortgage loans on real estate - The following table summarizes the carrying value of the mortgage loan portfolio by component:   December 31, 2014 December 31, 2013Principal $3,356,374 $3,124,626Unamortized premium (discount) and fees, net 10,086 12,519Mortgage provision allowance (2,890) (2,890)Total mortgage loans $3,363,570 $3,134,255 The recorded investment of the mortgage loan portfolio categorized as performing was $3,366,460 and $3,137,145 as of December 31, 2014 and 2013, respectively.The following table summarizes activity in the mortgage provision allowance:   Year Ended December 31,  2014 2013 2012  Commercial mortgages Commercial mortgages Commercial mortgagesBeginning balance $2,890 $2,890 $21,130Provision increases — 273 1,067Charge-off — (273) (992)Recovery — — (75)Provision decreases — — (18,240)Ending balance $2,890 $2,890 $2,890       Allowance ending balance by basis of impairment method:      Collectively evaluated for impairment $2,890 $2,890 $2,890       Recorded investment balance in the mortgage loan portfolio, gross of allowance, by basis of impairment method: $3,366,460 $3,137,145 $2,884,648Individually evaluated for impairment 12,986 13,906 14,970Collectively evaluated for impairment 3,353,474 3,123,239 2,869,678 Limited partnership and other corporationinterests - At December 31, 2014 and 2013, the Company had $49,421 and $79,236, respectively, invested in limited partnership and other corporation interests.  Included in limited partnership interests are investments in low-income housing partnerships (“LIHLP”) that qualify for federal and state tax credits and ownership interests in pooled investment funds. The Company has determined each investment in LIHLP to be considered a VIE but consolidation was not required because the Company has no power through voting rights or similar rights to direct the activities that most significantly impact the entities’ economic performance.  As a 99% limited partner in various upper-tier LIHLPs, the Company expects to receive the tax credits allocated to the partnership and operating losses from depreciation and interest expense.  The general partner is most closely involved in the development and management of the LIHLP project and has a small ownership of the partnership.   The carrying value and maximum exposure to loss in relation to the activities of the VIEs was $7,464 and $31,563 at December 31, 2014 and 2013, respectively. Special deposits and securities lending - The Company had securities on deposit with government authorities as required by certain insurance laws with fair values of $14,612 and $14,072 at December 31, 2014 and 2013, respectively. The Company participates in a securities lending program whereby securities are loaned to third parties.  Securities with a cost or amortized cost of $15,252 and $28,178 and estimated fair values of $15,423 and $27,166 were on loan under the program at December 31, 2014 and 2013, respectively.  The Company received cash of $13,741 and $18,534 and securities with a fair value of $2,131 and $9,424 as collateral at December 31, 2014 and 2013, respectively.Unrealized losses on fixed maturity investments classified as available-for-sale - The following tables summarize unrealized investment losses, including the non-credit-related portion of OTTI losses reported in AOCI, by class of investment:   December 31, 2014  Less than twelve months Twelve months or longer Total  Estimated Unrealized Estimated Unrealized Estimated UnrealizedFixed maturities: fair value loss and OTTI fair value loss and OTTI fair value loss and OTTIU.S. government direct obligations and U.S. agencies $566,335 $503 $74,322 $991 $640,657 $1,494Obligations of U.S. states and their subdivisions 18,280 218 41,064 681 59,344 899Foreign government securities 2,451 4 — — 2,451 4Corporate debt securities 836,263 16,775 764,528 65,329 1,600,791 82,104Asset-backed securities 88,312 849 200,072 12,853 288,384 13,702Residential mortgage-backed securities 4,663 11 24,052 1,921 28,715 1,932Commercial mortgage-backed securities 35,015 127 57,333 972 92,348 1,099Collateralized debt obligations 10,465 209 — — 10,465 209Total fixed maturities $1,561,784 $18,696 $1,161,371 $82,747 $2,723,155 $101,443Total number of securities in an unrealized loss position   134   153   287   December 31, 2013  Less than twelve months Twelve months or longer Total  Estimated Unrealized Estimated Unrealized Estimated UnrealizedFixed maturities: fair value loss and OTTI fair value loss and OTTI fair value loss and OTTIU.S. government direct obligations and U.S. agencies $2,399,373 $23,156 $5,192 $217 $2,404,565 $23,373Obligations of U.S. states and their subdivisions 214,979 16,713 837 239 215,816 16,952Foreign government securities 2,603 14 — — 2,603 14Corporate debt securities 2,632,093 144,367 511,376 79,165 3,143,469 223,532Asset-backed securities 305,377 12,763 305,740 16,387 611,117 29,150Residential mortgage-backed securities 32,131 3,454 1,011 19 33,142 3,473Commercial mortgage-backed securities 177,395 6,703 48,825 4,812 226,220 11,515Collateralized debt obligations — — 12,356 213 12,356 213Total fixed maturities $5,763,951 $207,170 $885,337 $101,052 $6,649,288 $308,222Total number of securities in an unrealized loss position   458   109   567 Fixed maturity investments - Total unrealized losses and OTTI decreased by $206,779, or 67%, from December 31, 2013 to December 31, 2014.  The majority, or $188,474, of the decrease was in the less than twelve months category.  The decrease in unrealized losses was across all asset classes and reflects lower interest rates at December 31, 2014 compared to December 31, 2013. Total unrealized losses greater than twelve months decreased by $18,305 from December 31, 2013 to December 31, 2014.  Corporate debt securities account for 79%, or $65,329, of the unrealized losses and OTTI greater than twelve months at December 31, 2014.  Non-investment grade corporate debt securities account for $9,921 of the unrealized losses and OTTI greater than twelve months and $8,899 of the losses are on perpetual debt investments issued by investment grade rated banks in the United Kingdom.  Management does not have the intent to sell these assets; therefore, an OTTI was not recognized in earnings. Asset-backed securities account for 16% of the unrealized losses and OTTI greater than twelve months at December 31, 2014.  The present value of the cash flows expected to be collected is not less than amortized cost and management does not have the intent to sell these assets; therefore, an OTTI was not recognized in earnings. Other-than-temporary impairment recognition - The OTTI on fixed maturity securities where the loss portion is bifurcated and the credit related component is recognized in realized investment gains (losses) is summarized as follows:   Year Ended December 31,  2014 2013 2012Beginning balance $167,961 $167,788 $186,999Additions:      Initial impairments - credit loss on securities not previously impaired — — 4,429Credit loss recognized on securities previously impaired — 173 —Reductions:      Due to sales, maturities, or payoffs during the period (646) — (23,640)Due to increases in cash flows expected to be collected that are recognized over the remaining life of the security (47,783) — —Ending balance $119,532 $167,961 $167,788 Net Investment Income The following table summarizes net investment income:   Year Ended December 31,  2014 2013 2012Investment income:      Fixed maturity and short-term investments $816,907 $766,367 $808,215Mortgage loans on real estate 149,497 147,944 138,411Policy loans 207,013 206,718 213,300Limited partnership interests 9,128 9,131 7,566Net interest on funds withheld balances under reinsurance agreements, related party 21,295 20,876 19,382Derivative instruments (1) 39,533 (44,610) 16,008Other 5,008 3,321 5,222  1,248,381 1,109,747 1,208,104Investment expenses (19,993) (18,358) (16,553)Net investment income $1,228,388 $1,091,389 $1,191,551 (1) Includes gains (losses) on the hedged asset for fair value hedges. Realized Investment Gains (Losses) The following table summarizes realized investment gains (losses):   Year Ended December 31,  2014 2013 2012Realized investment gains (losses):      Fixed maturity and short-term investments $54,219 $37,312 $105,675Derivative instruments 90,504 (62,077) (10,221)Mortgage loans on real estate 6,857 10,895 21,471Other (4,209) (266) (208)Realized investment gains (losses) $147,371 $(14,136) $116,717  Included in net investment income and realized investment gains (losses) are amounts allocable to the participating fund account.  This allocation is based upon the activity in a specific block of investments that are segmented for the benefit of the participating fund account. |

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| - Definition
The entire disclosure for  investments in certain debt and equity securities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694
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