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Summary of Investments (Fair Value of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fixed maturities: |  |
Amortized Cost | $ 1,709,100 | $ 1,761,289
Gross Unrealized Appreciation | 28,540 | 11,844
Gross Unrealized Depreciation | 7,077 | 23,645
Fair Value | 1,730,563 | 1,749,488
U.S. Treasury |  |
Fixed maturities: |  |
Amortized Cost | 26,821 | 27,632
Gross Unrealized Appreciation | 13 | 6
Gross Unrealized Depreciation | 143 | 220
Fair Value | 26,691 | 27,418
U.S. government agency |  |
Fixed maturities: |  |
Amortized Cost | 188,529 | 215,535
Gross Unrealized Appreciation | 1,417 | 896
Gross Unrealized Depreciation | 405 | 1,749
Fair Value | 189,541 | 214,682
States, municipalities and political subdivisions | General obligations | Midwest |  |
Fixed maturities: |  |
Amortized Cost | 86,782 | 94,806
Gross Unrealized Appreciation | 1,995 | 1,091
Gross Unrealized Depreciation | 98 | 685
Fair Value | 88,679 | 95,212
States, municipalities and political subdivisions | General obligations | Northeast |  |
Fixed maturities: |  |
Amortized Cost | 31,266 | 37,326
Gross Unrealized Appreciation | 866 | 432
Gross Unrealized Depreciation | 0 | 103
Fair Value | 32,132 | 37,655
States, municipalities and political subdivisions | General obligations | South |  |
Fixed maturities: |  |
Amortized Cost | 114,500 | 114,710
Gross Unrealized Appreciation | 1,755 | 754
Gross Unrealized Depreciation | 475 | 1,553
Fair Value | 115,780 | 113,911
States, municipalities and political subdivisions | General obligations | West |  |
Fixed maturities: |  |
Amortized Cost | 107,580 | 107,787
Gross Unrealized Appreciation | 2,592 | 1,229
Gross Unrealized Depreciation | 305 | 1,175
Fair Value | 109,867 | 107,841
States, municipalities and political subdivisions | Special revenue | Midwest |  |
Fixed maturities: |  |
Amortized Cost | 139,803 | 140,025
Gross Unrealized Appreciation | 3,520 | 1,609
Gross Unrealized Depreciation | 194 | 870
Fair Value | 143,129 | 140,764
States, municipalities and political subdivisions | Special revenue | Northeast |  |
Fixed maturities: |  |
Amortized Cost | 62,604 | 62,737
Gross Unrealized Appreciation | 1,123 | 452
Gross Unrealized Depreciation | 406 | 1,241
Fair Value | 63,321 | 61,948
States, municipalities and political subdivisions | Special revenue | South |  |
Fixed maturities: |  |
Amortized Cost | 229,505 | 237,848
Gross Unrealized Appreciation | 4,532 | 1,669
Gross Unrealized Depreciation | 1,101 | 3,708
Fair Value | 232,936 | 235,809
States, municipalities and political subdivisions | Special revenue | West |  |
Fixed maturities: |  |
Amortized Cost | 142,974 | 143,829
Gross Unrealized Appreciation | 2,905 | 1,294
Gross Unrealized Depreciation | 537 | 2,203
Fair Value | 145,342 | 142,920
Foreign bonds |  |
Fixed maturities: |  |
Amortized Cost | 4,941 | 9,698
Gross Unrealized Appreciation | 106 | 31
Gross Unrealized Depreciation | 0 | 13
Fair Value | 5,047 | 9,716
Public utilities |  |
Fixed maturities: |  |
Amortized Cost | 62,774 | 56,808
Gross Unrealized Appreciation | 878 | 274
Gross Unrealized Depreciation | 444 | 1,023
Fair Value | 63,208 | 56,059
Corporate bonds | Energy |  |
Fixed maturities: |  |
Amortized Cost | 28,158 | 28,909
Gross Unrealized Appreciation | 536 | 43
Gross Unrealized Depreciation | 41 | 304
Fair Value | 28,653 | 28,648
Corporate bonds | Industrials |  |
Fixed maturities: |  |
Amortized Cost | 53,836 | 53,867
Gross Unrealized Appreciation | 613 | 124
Gross Unrealized Depreciation | 171 | 906
Fair Value | 54,278 | 53,085
Corporate bonds | Consumer goods and services |  |
Fixed maturities: |  |
Amortized Cost | 48,151 | 54,323
Gross Unrealized Appreciation | 857 | 142
Gross Unrealized Depreciation | 209 | 819
Fair Value | 48,799 | 53,646
Corporate bonds | Health care |  |
Fixed maturities: |  |
Amortized Cost | 13,974 | 16,721
Gross Unrealized Appreciation | 294 | 42
Gross Unrealized Depreciation | 2 | 105
Fair Value | 14,266 | 16,658
Corporate bonds | Technology, media and telecommunications |  |
Fixed maturities: |  |
Amortized Cost | 25,895 | 26,819
Gross Unrealized Appreciation | 463 | 35
Gross Unrealized Depreciation | 138 | 678
Fair Value | 26,220 | 26,176
Corporate bonds | Financial services |  |
Fixed maturities: |  |
Amortized Cost | 91,876 | 81,286
Gross Unrealized Appreciation | 1,366 | 238
Gross Unrealized Depreciation | 669 | 2,175
Fair Value | 92,573 | 79,349
Mortgage-backed securities |  |
Fixed maturities: |  |
Amortized Cost | 7,401 | 7,642
Gross Unrealized Appreciation | 48 | 14
Gross Unrealized Depreciation | 134 | 232
Fair Value | 7,315 | 7,424
Asset-backed securities |  |
Fixed maturities: |  |
Amortized Cost | 3,274 | 3,256
Gross Unrealized Appreciation | 387 | 352
Gross Unrealized Depreciation | 125 | 113
Fair Value | 3,536 | 3,495
Government National Mortgage Association (GNMA) Insured Loans | Collateralized mortgage obligations |  |
Fixed maturities: |  |
Amortized Cost | 77,401 | 78,055
Gross Unrealized Appreciation | 750 | 380
Gross Unrealized Depreciation | 763 | 1,734
Fair Value | 77,388 | 76,701
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans | Collateralized mortgage obligations |  |
Fixed maturities: |  |
Amortized Cost | 108,333 | 108,403
Gross Unrealized Appreciation | 889 | 524
Gross Unrealized Depreciation | 513 | 1,304
Fair Value | 108,709 | 107,623
Federal National Mortgage Association (FNMA) Insured Loans | Collateralized mortgage obligations |  |
Fixed maturities: |  |
Amortized Cost | 52,722 | 53,267
Gross Unrealized Appreciation | 635 | 213
Gross Unrealized Depreciation | 204 | 732
Fair Value | $ 53,153 | $ 52,748

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