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Investments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed maturities, available for sale |  |
Amortized Cost | $ 2,148,140 | $ 2,257,188
Gross Unrealized Gains | 11,630 | 32,610
Gross Unrealized Losses | 33,849 | 9,556
Estimated Fair Value | 2,125,921 | 2,280,242
U.S. Treasury obligations |  |
Fixed maturities, available for sale |  |
Amortized Cost | 148,588 | 134,323
Gross Unrealized Gains | 249 | 485
Gross Unrealized Losses | 2,380 | 1,181
Estimated Fair Value | 146,457 | 133,627
U.S. Government-sponsored enterprise obligations |  |
Fixed maturities, available for sale |  |
Amortized Cost | 32,331 | 21,089
Gross Unrealized Gains | 21 | 73
Gross Unrealized Losses | 650 | 206
Estimated Fair Value | 31,702 | 20,956
State and municipal bonds |  |
Fixed maturities, available for sale |  |
Amortized Cost | 326,705 | 618,414
Gross Unrealized Gains | 5,488 | 14,248
Gross Unrealized Losses | 1,093 | 419
Estimated Fair Value | 331,100 | 632,243
Corporate debt |  |
Fixed maturities, available for sale |  |
Amortized Cost | 1,213,362 | 1,157,660
Gross Unrealized Gains | 4,655 | 15,205
Gross Unrealized Losses | 22,390 | 5,707
Estimated Fair Value | 1,195,627 | 1,167,158
Residential mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 208,052 | 196,741
Gross Unrealized Gains | 1,150 | 2,438
Gross Unrealized Losses | 4,966 | 1,335
Estimated Fair Value | 204,236 | 197,844
Agency commercial mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 14,080 | 10,827
Gross Unrealized Gains | 0 | 23
Gross Unrealized Losses | 268 | 108
Estimated Fair Value | 13,812 | 10,742
Other commercial mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 33,105 | 16,004
Gross Unrealized Gains | 47 | 91
Gross Unrealized Losses | 437 | 134
Estimated Fair Value | 32,715 | 15,961
Other asset-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 171,917 | 102,130
Gross Unrealized Gains | 20 | 47
Gross Unrealized Losses | 1,665 | 466
Estimated Fair Value | $ 170,272 | $ 101,711

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