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Summary of Investments (Investments in Unrealized Loss Position) (Details) $ in Thousands | Mar. 31, 2019 USD ($) issue | Dec. 31, 2018 USD ($) issue
--- | --- | ---
Number of Issues |  |
Less than 12 months (issues) | issue | 18 | 118
12 months or longer (issues) | issue | 196 | 291
Fair Value |  |
Less than 12 months | $ 32,905 | $ 207,671
12 months or longer | 453,677 | 698,835
Total | 486,582 | 906,506
Gross Unrealized Depreciation |  |
Less than 12 months | 545 | 3,067
12 months or longer | 6,532 | 20,578
Total | $ 7,077 | $ 23,645
U.S. Treasury |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 1 | 1
12 months or longer (issues) | issue | 5 | 5
Fair Value |  |
Less than 12 months | $ 8,006 | $ 8,018
12 months or longer | 14,672 | 14,645
Total | 22,678 | 22,663
Gross Unrealized Depreciation |  |
Less than 12 months | 2 | 7
12 months or longer | 141 | 213
Total | $ 143 | $ 220
U.S. government agency |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 4
12 months or longer (issues) | issue | 9 | 17
Fair Value |  |
Less than 12 months | $ 0 | $ 17,907
12 months or longer | 44,960 | 80,696
Total | 44,960 | 98,603
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 81
12 months or longer | 405 | 1,668
Total | $ 405 | $ 1,749
General obligations | Midwest |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 2
12 months or longer (issues) | issue | 3 | 7
Fair Value |  |
Less than 12 months | $ 0 | $ 2,939
12 months or longer | 13,089 | 23,749
Total | 13,089 | 26,688
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 5
12 months or longer | 98 | 680
Total | $ 98 | $ 685
General obligations | Northeast |  |
Number of Issues |  |
Less than 12 months (issues) | issue |  | 0
12 months or longer (issues) | issue |  | 3
Fair Value |  |
Less than 12 months |  | $ 0
12 months or longer |  | 12,110
Total |  | 12,110
Gross Unrealized Depreciation |  |
Less than 12 months |  | 0
12 months or longer |  | 103
Total |  | $ 103
General obligations | South |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 1
12 months or longer (issues) | issue | 8 | 22
Fair Value |  |
Less than 12 months | $ 0 | $ 778
12 months or longer | 24,642 | 50,174
Total | 24,642 | 50,952
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 2
12 months or longer | 475 | 1,551
Total | $ 475 | $ 1,553
General obligations | West |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 1
12 months or longer (issues) | issue | 8 | 16
Fair Value |  |
Less than 12 months | $ 0 | $ 1,203
12 months or longer | 24,221 | 48,499
Total | 24,221 | 49,702
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 5
12 months or longer | 305 | 1,170
Total | $ 305 | $ 1,175
Special revenue | Midwest |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 4
12 months or longer (issues) | issue | 8 | 19
Fair Value |  |
Less than 12 months | $ 0 | $ 3,892
12 months or longer | 18,051 | 43,854
Total | 18,051 | 47,746
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 8
12 months or longer | 194 | 862
Total | $ 194 | $ 870
Special revenue | Northeast |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 0
12 months or longer (issues) | issue | 7 | 14
Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or longer | 19,711 | 37,629
Total | 19,711 | 37,629
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 0
12 months or longer | 406 | 1,241
Total | $ 406 | $ 1,241
Special revenue | South |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 4
12 months or longer (issues) | issue | 25 | 45
Fair Value |  |
Less than 12 months | $ 0 | $ 4,298
12 months or longer | 61,235 | 107,016
Total | 61,235 | 111,314
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 30
12 months or longer | 1,101 | 3,678
Total | $ 1,101 | $ 3,708
Special revenue | West |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 4
12 months or longer (issues) | issue | 18 | 28
Fair Value |  |
Less than 12 months | $ 0 | $ 11,115
12 months or longer | 50,929 | 69,667
Total | 50,929 | 80,782
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 32
12 months or longer | 537 | 2,171
Total | $ 537 | $ 2,203
Foreign bonds |  |
Number of Issues |  |
Less than 12 months (issues) | issue |  | 1
12 months or longer (issues) | issue |  | 0
Fair Value |  |
Less than 12 months |  | $ 2,984
12 months or longer |  | 0
Total |  | 2,984
Gross Unrealized Depreciation |  |
Less than 12 months |  | 13
12 months or longer |  | 0
Total |  | $ 13
Public utilities |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 4 | 12
12 months or longer (issues) | issue | 7 | 8
Fair Value |  |
Less than 12 months | $ 9,755 | $ 25,781
12 months or longer | 16,101 | 17,253
Total | 25,856 | 43,034
Gross Unrealized Depreciation |  |
Less than 12 months | 244 | 552
12 months or longer | 200 | 471
Total | $ 444 | $ 1,023
Corporate bonds | Energy |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 7
12 months or longer (issues) | issue | 2 | 2
Fair Value |  |
Less than 12 months | $ 0 | $ 12,556
12 months or longer | 4,224 | 4,099
Total | 4,224 | 16,655
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 148
12 months or longer | 41 | 156
Total | $ 41 | $ 304
Corporate bonds | Industrials |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 1 | 9
12 months or longer (issues) | issue | 4 | 4
Fair Value |  |
Less than 12 months | $ 5,010 | $ 21,970
12 months or longer | 12,389 | 11,040
Total | 17,399 | 33,010
Gross Unrealized Depreciation |  |
Less than 12 months | 17 | 397
12 months or longer | 154 | 509
Total | $ 171 | $ 906
Corporate bonds | Consumer goods and services |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 14
12 months or longer (issues) | issue | 6 | 5
Fair Value |  |
Less than 12 months | $ 0 | $ 30,399
12 months or longer | 12,851 | 9,554
Total | 12,851 | 39,953
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 527
12 months or longer | 209 | 292
Total | $ 209 | $ 819
Corporate bonds | Health care |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 3
12 months or longer (issues) | issue | 1 | 1
Fair Value |  |
Less than 12 months | $ 0 | $ 6,203
12 months or longer | 351 | 345
Total | 351 | 6,548
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 97
12 months or longer | 2 | 8
Total | $ 2 | $ 105
Corporate bonds | Technology, media and telecommunications |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 6
12 months or longer (issues) | issue | 4 | 5
Fair Value |  |
Less than 12 months | $ 0 | $ 12,638
12 months or longer | 8,929 | 9,619
Total | 8,929 | 22,257
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 288
12 months or longer | 138 | 390
Total | $ 138 | $ 678
Corporate bonds | Financial services |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 1 | 13
12 months or longer (issues) | issue | 11 | 13
Fair Value |  |
Less than 12 months | $ 4,744 | $ 30,177
12 months or longer | 29,445 | 32,855
Total | 34,189 | 63,032
Gross Unrealized Depreciation |  |
Less than 12 months | 256 | 650
12 months or longer | 413 | 1,525
Total | $ 669 | $ 2,175
Mortgage-backed securities |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 9 | 22
12 months or longer (issues) | issue | 27 | 22
Fair Value |  |
Less than 12 months | $ 549 | $ 1,539
12 months or longer | 4,548 | 4,166
Total | 5,097 | 5,705
Gross Unrealized Depreciation |  |
Less than 12 months | 4 | 34
12 months or longer | 130 | 198
Total | $ 134 | $ 232
Asset-backed securities |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 1
12 months or longer (issues) | issue | 1 | 0
Fair Value |  |
Less than 12 months | $ 0 | $ 2,829
12 months or longer | 2,835 | 0
Total | 2,835 | 2,829
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 113
12 months or longer | 125 | 0
Total | $ 125 | $ 113
Government National Mortgage Association (GNMA) Insured Loans | Collateralized mortgage obligations |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 1 | 2
12 months or longer (issues) | issue | 20 | 22
Fair Value |  |
Less than 12 months | $ 4,841 | $ 3,797
12 months or longer | 43,142 | 44,690
Total | 47,983 | 48,487
Gross Unrealized Depreciation |  |
Less than 12 months | 22 | 55
12 months or longer | 741 | 1,679
Total | $ 763 | $ 1,734
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans | Collateralized mortgage obligations |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 1 | 3
12 months or longer (issues) | issue | 11 | 18
Fair Value |  |
Less than 12 months | $ 0 | $ 4,541
12 months or longer | 26,018 | 38,189
Total | 26,018 | 42,730
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 20
12 months or longer | 513 | 1,284
Total | $ 513 | $ 1,304
Federal National Mortgage Association (FNMA) Insured Loans | Collateralized mortgage obligations |  |
Number of Issues |  |
Less than 12 months (issues) | issue | 0 | 4
12 months or longer (issues) | issue | 11 | 15
Fair Value |  |
Less than 12 months | $ 0 | $ 2,107
12 months or longer | 21,334 | 38,986
Total | 21,334 | 41,093
Gross Unrealized Depreciation |  |
Less than 12 months | 0 | 3
12 months or longer | 204 | 729
Total | $ 204 | $ 732

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