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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
U.S. Treasury obligations [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | $ 122,855 | $ 163,714
Due in one year or less | 10,703 |
Due after one year through five years | 94,067 |
Due after five years through ten years | 15,923 |
Due after ten years | 3,199 |
Total Fair Value | 123,892 | 166,512
U.S. Government-sponsored enterprise obligations [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 25,456 | 38,022
Due in one year or less | 2,290 |
Due after one year through five years | 16,593 |
Due after five years through ten years | 7,312 |
Due after ten years | 139 |
Total Fair Value | 26,334 | 39,563
State and municipal bonds [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 904,719 | 1,015,555
Due in one year or less | 48,752 |
Due after one year through five years | 332,489 |
Due after five years through ten years | 428,872 |
Due after ten years | 130,522 |
Total Fair Value | 940,635 | 1,062,615
Corporate debt [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 1,296,128 | 1,389,970
Due in one year or less | 104,746 |
Due after one year through five years | 698,148 |
Due after five years through ten years | 455,849 |
Due after ten years | 32,943 |
Total Fair Value | 1,291,686 | 1,417,101
Residential mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 233,659 | 266,306
Total Fair Value | 238,387 | 276,056
Agency commercial mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 10,851 | 15,344
Total Fair Value | 10,999 | 15,493
Other commercial mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 29,983 | 50,025
Total Fair Value | 30,134 | 51,063
Other asset-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 98,412 | 116,541
Total Fair Value | 98,220 | 116,624
Debt Securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 2,722,063 | 3,055,477
Total Fair Value | $ 2,760,287 | $ 3,145,027

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