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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed maturities, available for sale |  |
Amortized Cost | $ 2,148,140 | $ 2,257,188
Estimated Fair Value | 2,125,921 | 2,280,242
U.S. Treasury obligations |  |
Fixed maturities, available for sale |  |
Amortized Cost | 148,588 | 134,323
Due in one year or less | 37,731 |
Due after one year through five years | 84,483 |
Due after five years through ten years | 21,407 |
Due after ten years | 2,836 |
Estimated Fair Value | 146,457 | 133,627
U.S. Government-sponsored enterprise obligations |  |
Fixed maturities, available for sale |  |
Amortized Cost | 32,331 | 21,089
Due in one year or less | 206 |
Due after one year through five years | 11,647 |
Due after five years through ten years | 19,715 |
Due after ten years | 134 |
Estimated Fair Value | 31,702 | 20,956
State and municipal bonds |  |
Fixed maturities, available for sale |  |
Amortized Cost | 326,705 | 618,414
Due in one year or less | 25,562 |
Due after one year through five years | 126,115 |
Due after five years through ten years | 140,281 |
Due after ten years | 39,142 |
Estimated Fair Value | 331,100 | 632,243
Corporate debt |  |
Fixed maturities, available for sale |  |
Amortized Cost | 1,213,362 | 1,157,660
Due in one year or less | 116,559 |
Due after one year through five years | 666,434 |
Due after five years through ten years | 374,029 |
Due after ten years | 38,605 |
Estimated Fair Value | 1,195,627 | 1,167,158
Residential mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 208,052 | 196,741
Estimated Fair Value | 204,236 | 197,844
Agency commercial mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 14,080 | 10,827
Estimated Fair Value | 13,812 | 10,742
Other commercial mortgage-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 33,105 | 16,004
Estimated Fair Value | 32,715 | 15,961
Other asset-backed securities |  |
Fixed maturities, available for sale |  |
Amortized Cost | 171,917 | 102,130
Estimated Fair Value | $ 170,272 | $ 101,711

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