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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | $ 7,161,917 | $ 7,152,127
Amortized Cost or Cost | 140,553 | 134,013
Fair Value | 7,578,585 | 7,456,708
Fair Value | 156,909 | 141,649
Total Fixed Maturity Securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 7,161,917 | 7,152,127
Unrealized Investment Gains | 446,554 | 374,991
Unrealized Investment Losses | 29,886 | 70,410
Fair Value | 7,578,585 | 7,456,708
OTTI in AOCI | 1,447 | 1,618
Mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 589,643 | 587,355
Unrealized Investment Gains | 36,054 | 34,256
Unrealized Investment Losses | 2,633 | 6,720
Fair Value | 623,064 | 614,891
OTTI in AOCI | 0 | 0
Other, including U.S. Treasury Securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 588,713 | 458,745
Unrealized Investment Gains | 23,550 | 18,518
Unrealized Investment Losses | 5,913 | 10,120
Fair Value | 606,350 | 467,143
OTTI in AOCI | 0 | 0
Municipal bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 1,659,648 | 1,648,252
Unrealized Investment Gains | 168,001 | 143,733
Unrealized Investment Losses | 10,429 | 22,588
Fair Value | 1,817,220 | 1,769,397
OTTI in AOCI | 0 | 0
Foreign government bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 93,779 | 93,864
Unrealized Investment Gains | 6,272 | 5,102
Unrealized Investment Losses | 5 | 297
Fair Value | 100,046 | 98,669
OTTI in AOCI | 0 | 0
Corporate bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 2,645,268 | 2,672,818
Unrealized Investment Gains | 186,601 | 152,229
Unrealized Investment Losses | 4,261 | 14,826
Fair Value | 2,827,608 | 2,810,221
OTTI in AOCI | 0 | 0
Other mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 1,584,866 | 1,691,093
Unrealized Investment Gains | 26,076 | 21,153
Unrealized Investment Losses | 6,645 | 15,859
Fair Value | 1,604,297 | 1,696,387
OTTI in AOCI | 1,447 | 1,618
Equity securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost or Cost | 140,553 | 134,013
Unrealized Investment Gains | 17,911 | 13,210
Unrealized Investment Losses | 1,555 | 5,574
Fair Value | 156,909 | 141,649
OTTI in AOCI | 0 | 0
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 310,403 | 272,668
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 368,396 | 378,683
Government National Mortgage Association Certificates and Obligations (GNMA) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | $ 111,458 | $ 115,627

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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