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Investments (Investments Held in a Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Fair Value | $ 1,547,399 | $ 850,838
Less than 12 months, Fair Value | 1,329,365 | 603,468
More than 12 months, Fair Value | 218,034 | 247,370
Unrealized Loss |  |
Unrealized Loss | 33,849 | 9,556
Less than 12 months, Unrealized Loss | 25,384 | 4,314
More than 12 months, Unrealized Loss | 8,465 | 5,242
U.S. Treasury obligations |  |
Fair Value |  |
Fair Value | 128,506 | 110,788
Less than 12 months, Fair Value | 96,926 | 67,135
More than 12 months, Fair Value | 31,580 | 43,653
Unrealized Loss |  |
Unrealized Loss | 2,380 | 1,181
Less than 12 months, Unrealized Loss | 1,589 | 554
More than 12 months, Unrealized Loss | 791 | 627
U.S. Government-sponsored enterprise obligations |  |
Fair Value |  |
Fair Value | 30,769 | 17,032
Less than 12 months, Fair Value | 23,960 | 10,182
More than 12 months, Fair Value | 6,809 | 6,850
Unrealized Loss |  |
Unrealized Loss | 650 | 206
Less than 12 months, Unrealized Loss | 397 | 64
More than 12 months, Unrealized Loss | 253 | 142
State and municipal bonds |  |
Fair Value |  |
Fair Value | 100,622 | 23,122
Less than 12 months, Fair Value | 98,073 | 15,168
More than 12 months, Fair Value | 2,549 | 7,954
Unrealized Loss |  |
Unrealized Loss | 1,093 | 419
Less than 12 months, Unrealized Loss | 1,035 | 102
More than 12 months, Unrealized Loss | 58 | 317
Corporate debt |  |
Fair Value |  |
Fair Value | 919,141 | 487,578
Less than 12 months, Fair Value | 801,410 | 365,541
More than 12 months, Fair Value | 117,731 | 122,037
Unrealized Loss |  |
Unrealized Loss | 22,390 | 5,707
Less than 12 months, Unrealized Loss | 17,525 | 2,730
More than 12 months, Unrealized Loss | 4,865 | 2,977
Residential mortgage-backed securities |  |
Fair Value |  |
Fair Value | 173,133 | 109,659
Less than 12 months, Fair Value | 131,124 | 64,121
More than 12 months, Fair Value | 42,009 | 45,538
Unrealized Loss |  |
Unrealized Loss | 4,966 | 1,335
Less than 12 months, Unrealized Loss | 2,839 | 402
More than 12 months, Unrealized Loss | 2,127 | 933
Agency commercial mortgage-backed securities |  |
Fair Value |  |
Fair Value | 13,812 | 4,423
Less than 12 months, Fair Value | 11,929 | 2,458
More than 12 months, Fair Value | 1,883 | 1,965
Unrealized Loss |  |
Unrealized Loss | 268 | 108
Less than 12 months, Unrealized Loss | 135 | 34
More than 12 months, Unrealized Loss | 133 | 74
Other commercial mortgage-backed securities |  |
Fair Value |  |
Fair Value | 26,251 | 12,878
Less than 12 months, Fair Value | 24,311 | 7,939
More than 12 months, Fair Value | 1,940 | 4,939
Unrealized Loss |  |
Unrealized Loss | 437 | 134
Less than 12 months, Unrealized Loss | 390 | 82
More than 12 months, Unrealized Loss | 47 | 52
Other asset-backed securities |  |
Fair Value |  |
Fair Value | 155,165 | 85,358
Less than 12 months, Fair Value | 141,632 | 70,924
More than 12 months, Fair Value | 13,533 | 14,434
Unrealized Loss |  |
Unrealized Loss | 1,665 | 466
Less than 12 months, Unrealized Loss | 1,474 | 346
More than 12 months, Unrealized Loss | $ 191 | $ 120

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