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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | $ 5,672,315 | $ 5,456,980
Fair Value | 6,168,558 | 5,791,676
FNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 390,700 | 405,100
FHLMC |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 322,400 | 283,100
GNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 137,400 | 147,400
Total Fixed Maturity Securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 5,672,315 | 5,456,980
Unrealized Gains | 541,202 | 348,310
Unrealized Losses | 44,959 | 13,614
Fair Value | 6,168,558 | 5,791,676
Mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 617,856 | 684,543
Unrealized Gains | 85,219 | 41,263
Unrealized Losses | 213 | 1,487
Fair Value | 702,862 | 724,319
Other, including U.S. Treasury securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 341,771 | 436,665
Unrealized Gains | 42,683 | 22,824
Unrealized Losses | 317 | 621
Fair Value | 384,137 | 458,868
Municipal bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,621,308 | 1,545,787
Unrealized Gains | 196,317 | 141,996
Unrealized Losses | 1,124 | 1,580
Fair Value | 1,816,501 | 1,686,203
Foreign government bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 40,143 | 42,801
Unrealized Gains | 4,644 | 2,569
Unrealized Losses | 0 | 0
Fair Value | 44,787 | 45,370
Corporate bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,802,423 | 1,464,444
Unrealized Gains | 189,986 | 118,775
Unrealized Losses | 8,926 | 1,795
Fair Value | 1,983,483 | 1,581,424
Other asset-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,248,814 | 1,282,740
Unrealized Gains | 22,353 | 20,883
Unrealized Losses | 34,379 | 8,131
Fair Value | $ 1,236,788 | $ 1,295,492

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