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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	$ 5,453,433	$ 7,373,911
Fair Value	5,839,560	7,515,318
Federal National Mortgage Association Certificates and Obligations (FNMA)
Unrealized gains and losses on fixed maturities and equity securities
Fair Value	429,676	441,308
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)
Unrealized gains and losses on fixed maturities and equity securities
Fair Value	290,964	417,308
Government National Mortgage Association Certificates and Obligations (GNMA)
Unrealized gains and losses on fixed maturities and equity securities
Fair Value	154,226	96,466
Total Fixed Maturity Securities
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	5,453,433	7,373,911
Unrealized Gains	396,782	249,085
Unrealized Losses	10,655	107,678
Fair Value	5,839,560	7,515,318
Mortgage-backed securities
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	698,794	778,038
Unrealized Gains	55,868	22,724
Unrealized Losses	307	13,321
Fair Value	754,355	787,441
Other, including U.S. Treasury securities
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	430,149	835,096
Unrealized Gains	28,161	16,127
Unrealized Losses	135	17,681
Fair Value	458,175	833,542
Municipal bonds
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	1,511,967	1,884,313
Unrealized Gains	164,811	133,150
Unrealized Losses	356	13,494
Fair Value	1,676,422	2,003,969
Foreign government bonds
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	45,301	83,343
Unrealized Gains	2,616	2,321
Unrealized Losses	2	760
Fair Value	47,915	84,904
Corporate bonds
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	1,465,217	2,054,105
Unrealized Gains	121,861	64,296
Unrealized Losses	1,970	38,891
Fair Value	1,585,108	2,079,510
Other mortgage-backed securities
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost	1,302,005	1,739,016
Unrealized Gains	23,465	10,467
Unrealized Losses	7,885	23,531
Fair Value	$ 1,317,585	$ 1,725,952

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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