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Investments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
U.S. Treasury obligations [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | $ 147,826 | $ 146,186
Gross Unrealized Gains | 1,203 | 1,264
Gross Unrealized Losses | 818 | 911
Estimated Fair Value | 148,211 | 146,539
U.S. Government-sponsored enterprise obligations [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 28,621 | 30,038
Gross Unrealized Gains | 241 | 388
Gross Unrealized Losses | 161 | 191
Estimated Fair Value | 28,701 | 30,235
State and municipal bonds [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 755,639 | 790,154
Gross Unrealized Gains | 19,139 | 17,261
Gross Unrealized Losses | 4,717 | 6,952
Estimated Fair Value | 770,061 | 800,463
Corporate debt [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 1,291,140 | 1,264,812
Gross Unrealized Gains | 21,812 | 22,659
Gross Unrealized Losses | 6,979 | 8,480
Estimated Fair Value | 1,305,973 | 1,278,991
Residential mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 206,455 | 216,285
Gross Unrealized Gains | 3,407 | 3,667
Gross Unrealized Losses | 1,956 | 2,046
Estimated Fair Value | 207,906 | 217,906
Agency commercial mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 12,727 | 12,837
Gross Unrealized Gains | 63 | 89
Gross Unrealized Losses | 102 | 143
Estimated Fair Value | 12,688 | 12,783
Other commercial mortgage-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 19,650 | 19,571
Gross Unrealized Gains | 153 | 177
Gross Unrealized Losses | 106 | 137
Estimated Fair Value | 19,697 | 19,611
Other asset-backed securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 111,214 | 106,938
Gross Unrealized Gains | 191 | 207
Gross Unrealized Losses | 213 | 267
Estimated Fair Value | 111,192 | 106,878
Debt Securities [Member] |  |
Fixed maturities, available for sale |  |
Amortized Cost | 2,573,272 | 2,586,821
Gross Unrealized Gains | 46,209 | 45,712
Gross Unrealized Losses | 15,052 | 19,127
Estimated Fair Value | $ 2,604,429 | $ 2,613,406

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