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Summary of Investments (Investments in Unrealized Loss Position) (Details) $ in Thousands | Mar. 31, 2016 USD ($) issue | Dec. 31, 2015 USD ($) issue
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AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 107 | 378
Less than 12 months, Fair Value | $ 186,804 | $ 747,083
Less than 12 months, Gross Unrealized Depreciation | $ 4,989 | $ 17,414
12 months or longer, Number of Issues | issue | 82 | 92
12 months or longer, Fair Value | $ 116,749 | $ 140,558
12 months or longer, Gross Unrealized Depreciation | 7,545 | 10,677
Total, Fair Value | 303,553 | 887,641
Total, Gross Unrealized Depreciation | $ 12,534 | $ 28,091
Fixed Maturities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 82 | 350
Less than 12 months, Fair Value | $ 183,940 | $ 743,274
Less than 12 months, Gross Unrealized Depreciation | $ 4,760 | $ 16,962
12 months or longer, Number of Issues | issue | 65 | 79
12 months or longer, Fair Value | $ 116,197 | $ 140,088
12 months or longer, Gross Unrealized Depreciation | 7,048 | 10,140
Total, Fair Value | 300,137 | 883,362
Total, Gross Unrealized Depreciation | $ 11,808 | $ 27,102
U.S. Treasury [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 6
Less than 12 months, Fair Value | $ 0 | $ 6,408
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 26
12 months or longer, Number of Issues | issue | 2 | 2
12 months or longer, Fair Value | $ 1,637 | $ 1,634
12 months or longer, Gross Unrealized Depreciation | 3 | 12
Total, Fair Value | 1,637 | 8,042
Total, Gross Unrealized Depreciation | $ 3 | $ 38
U.S. Government Agency [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 7 | 38
Less than 12 months, Fair Value | $ 18,173 | $ 104,621
Less than 12 months, Gross Unrealized Depreciation | $ 25 | $ 1,771
12 months or longer, Number of Issues | issue | 1 | 6
12 months or longer, Fair Value | $ 2,995 | $ 18,821
12 months or longer, Gross Unrealized Depreciation | 3 | 629
Total, Fair Value | 21,168 | 123,442
Total, Gross Unrealized Depreciation | $ 28 | $ 2,400
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | Midwest [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 3 | 4
Less than 12 months, Fair Value | $ 9,619 | $ 2,417
Less than 12 months, Gross Unrealized Depreciation | $ 14 | $ 12
12 months or longer, Number of Issues | issue | 0 | 1
12 months or longer, Fair Value | $ 0 | $ 528
12 months or longer, Gross Unrealized Depreciation | 0 | 6
Total, Fair Value | 9,619 | 2,945
Total, Gross Unrealized Depreciation | $ 14 | $ 18
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | South [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue |  | 3
Less than 12 months, Fair Value |  | $ 4,805
Less than 12 months, Gross Unrealized Depreciation |  | $ 55
12 months or longer, Number of Issues | issue |  | 8
12 months or longer, Fair Value |  | $ 3,743
12 months or longer, Gross Unrealized Depreciation |  | 79
Total, Fair Value |  | 8,548
Total, Gross Unrealized Depreciation |  | $ 134
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | West [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 1 | 4
Less than 12 months, Fair Value | $ 3,136 | $ 8,927
Less than 12 months, Gross Unrealized Depreciation | $ 37 | $ 23
12 months or longer, Number of Issues | issue | 2 | 2
12 months or longer, Fair Value | $ 2,301 | $ 2,274
12 months or longer, Gross Unrealized Depreciation | 12 | 44
Total, Fair Value | 5,437 | 11,201
Total, Gross Unrealized Depreciation | $ 49 | $ 67
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | Midwest [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue |  | 0
Less than 12 months, Fair Value |  | $ 0
Less than 12 months, Gross Unrealized Depreciation |  | $ 0
12 months or longer, Number of Issues | issue |  | 1
12 months or longer, Fair Value |  | $ 2,494
12 months or longer, Gross Unrealized Depreciation |  | 30
Total, Fair Value |  | 2,494
Total, Gross Unrealized Depreciation |  | $ 30
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | Northeast [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 1 | 1
Less than 12 months, Fair Value | $ 1,037 | $ 4,755
Less than 12 months, Gross Unrealized Depreciation | $ 4 | $ 212
12 months or longer, Number of Issues | issue | 0 | 0
12 months or longer, Fair Value | $ 0 | $ 0
12 months or longer, Gross Unrealized Depreciation | 0 | 0
Total, Fair Value | 1,037 | 4,755
Total, Gross Unrealized Depreciation | $ 4 | $ 212
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | South [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 3 | 4
Less than 12 months, Fair Value | $ 4,149 | $ 7,445
Less than 12 months, Gross Unrealized Depreciation | $ 7 | $ 26
12 months or longer, Number of Issues | issue | 0 | 2
12 months or longer, Fair Value | $ 0 | $ 1,851
12 months or longer, Gross Unrealized Depreciation | 0 | 1
Total, Fair Value | 4,149 | 9,296
Total, Gross Unrealized Depreciation | $ 7 | $ 27
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | West [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 4
Less than 12 months, Fair Value | $ 0 | $ 6,851
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 44
12 months or longer, Number of Issues | issue | 1 | 0
12 months or longer, Fair Value | $ 719 | $ 0
12 months or longer, Gross Unrealized Depreciation | 2 | 0
Total, Fair Value | 719 | 6,851
Total, Gross Unrealized Depreciation | $ 2 | $ 44
Foreign Bonds [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 7 | 9
Less than 12 months, Fair Value | $ 11,277 | $ 16,991
Less than 12 months, Gross Unrealized Depreciation | $ 534 | $ 1,289
12 months or longer, Number of Issues | issue | 2 | 2
12 months or longer, Fair Value | $ 3,804 | $ 4,036
12 months or longer, Gross Unrealized Depreciation | 1,391 | 1,168
Total, Fair Value | 15,081 | 21,027
Total, Gross Unrealized Depreciation | $ 1,925 | $ 2,457
Public Utilities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 4 | 35
Less than 12 months, Fair Value | $ 8,231 | $ 72,680
Less than 12 months, Gross Unrealized Depreciation | $ 394 | $ 880
12 months or longer, Number of Issues | issue | 6 | 5
12 months or longer, Fair Value | $ 5,997 | $ 2,840
12 months or longer, Gross Unrealized Depreciation | 432 | 371
Total, Fair Value | 14,228 | 75,520
Total, Gross Unrealized Depreciation | $ 826 | $ 1,251
Corporate Bonds [Member] | Energy [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 20 | 29
Less than 12 months, Fair Value | $ 44,540 | $ 61,496
Less than 12 months, Gross Unrealized Depreciation | $ 2,328 | $ 3,286
12 months or longer, Number of Issues | issue | 5 | 4
12 months or longer, Fair Value | $ 10,764 | $ 7,991
12 months or longer, Gross Unrealized Depreciation | 1,094 | 1,427
Total, Fair Value | 55,304 | 69,487
Total, Gross Unrealized Depreciation | $ 3,422 | $ 4,713
Corporate Bonds [Member] | Industrials [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 8 | 38
Less than 12 months, Fair Value | $ 16,891 | $ 78,588
Less than 12 months, Gross Unrealized Depreciation | $ 618 | $ 3,631
12 months or longer, Number of Issues | issue | 8 | 3
12 months or longer, Fair Value | $ 15,276 | $ 6,649
12 months or longer, Gross Unrealized Depreciation | 2,658 | 3,032
Total, Fair Value | 32,167 | 85,237
Total, Gross Unrealized Depreciation | $ 3,276 | $ 6,663
Corporate Bonds [Member] | Consumer Goods and Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 24
Less than 12 months, Fair Value | $ 0 | $ 64,661
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 770
12 months or longer, Number of Issues | issue | 4 | 4
12 months or longer, Fair Value | $ 2,486 | $ 2,491
12 months or longer, Gross Unrealized Depreciation | 3 | 6
Total, Fair Value | 2,486 | 67,152
Total, Gross Unrealized Depreciation | $ 3 | $ 776
Corporate Bonds [Member] | Health Care [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 18
Less than 12 months, Fair Value | $ 0 | $ 43,992
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 652
12 months or longer, Number of Issues | issue | 2 | 2
12 months or longer, Fair Value | $ 2,732 | $ 3,737
12 months or longer, Gross Unrealized Depreciation | 43 | 139
Total, Fair Value | 2,732 | 47,729
Total, Gross Unrealized Depreciation | $ 43 | $ 791
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 9 | 22
Less than 12 months, Fair Value | $ 26,290 | $ 59,503
Less than 12 months, Gross Unrealized Depreciation | $ 365 | $ 1,478
12 months or longer, Number of Issues | issue | 4 | 2
12 months or longer, Fair Value | $ 15,132 | $ 8,940
12 months or longer, Gross Unrealized Depreciation | 705 | 525
Total, Fair Value | 41,422 | 68,443
Total, Gross Unrealized Depreciation | $ 1,070 | $ 2,003
Corporate Bonds [Member] | Financial Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 8 | 49
Less than 12 months, Fair Value | $ 17,662 | $ 92,814
Less than 12 months, Gross Unrealized Depreciation | $ 160 | $ 1,143
12 months or longer, Number of Issues | issue | 3 | 0
12 months or longer, Fair Value | $ 6,130 | $ 0
12 months or longer, Gross Unrealized Depreciation | 68 | 0
Total, Fair Value | 23,792 | 92,814
Total, Gross Unrealized Depreciation | $ 228 | $ 1,143
Mortgage-Backed Securities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 9
Less than 12 months, Fair Value | $ 0 | $ 7,423
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 43
12 months or longer, Number of Issues | issue | 4 | 4
12 months or longer, Fair Value | $ 1,379 | $ 183
12 months or longer, Gross Unrealized Depreciation | 17 | 8
Total, Fair Value | 1,379 | 7,606
Total, Gross Unrealized Depreciation | $ 17 | $ 51
Government National Mortgage Association [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 5 | 17
Less than 12 months, Fair Value | $ 7,888 | $ 29,769
Less than 12 months, Gross Unrealized Depreciation | $ 22 | $ 437
12 months or longer, Number of Issues | issue | 12 | 14
12 months or longer, Fair Value | $ 26,988 | $ 40,027
12 months or longer, Gross Unrealized Depreciation | 381 | 1,548
Total, Fair Value | 34,876 | 69,796
Total, Gross Unrealized Depreciation | $ 403 | $ 1,985
Federal Home Loan Mortgage Corporation [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 1 | 20
Less than 12 months, Fair Value | $ 6,970 | $ 35,343
Less than 12 months, Gross Unrealized Depreciation | $ 18 | $ 644
12 months or longer, Number of Issues | issue | 5 | 6
12 months or longer, Fair Value | $ 12,692 | $ 19,887
12 months or longer, Gross Unrealized Depreciation | 131 | 698
Total, Fair Value | 19,662 | 55,230
Total, Gross Unrealized Depreciation | $ 149 | $ 1,342
Federal National Mortgage Association [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 4 | 15
Less than 12 months, Fair Value | $ 5,503 | $ 32,800
Less than 12 months, Gross Unrealized Depreciation | $ 22 | $ 524
12 months or longer, Number of Issues | issue | 4 | 11
12 months or longer, Fair Value | $ 5,165 | $ 11,962
12 months or longer, Gross Unrealized Depreciation | 105 | 417
Total, Fair Value | 10,668 | 44,762
Total, Gross Unrealized Depreciation | $ 127 | $ 941
Asset-backed Securities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 1 | 1
Less than 12 months, Fair Value | $ 2,574 | $ 985
Less than 12 months, Gross Unrealized Depreciation | $ 212 | $ 16
12 months or longer, Number of Issues | issue | 0 | 0
12 months or longer, Fair Value | $ 0 | $ 0
12 months or longer, Gross Unrealized Depreciation | 0 | 0
Total, Fair Value | 2,574 | 985
Total, Gross Unrealized Depreciation | $ 212 | $ 16
Equity Securities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 25 | 28
Less than 12 months, Fair Value | $ 2,864 | $ 3,809
Less than 12 months, Gross Unrealized Depreciation | $ 229 | $ 452
12 months or longer, Number of Issues | issue | 17 | 13
12 months or longer, Fair Value | $ 552 | $ 470
12 months or longer, Gross Unrealized Depreciation | 497 | 537
Total, Fair Value | 3,416 | 4,279
Total, Gross Unrealized Depreciation | $ 726 | $ 989
Common Stocks [Member] | Public Utilities [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 0 | 0
Less than 12 months, Fair Value | $ 0 | $ 0
Less than 12 months, Gross Unrealized Depreciation | $ 0 | $ 0
12 months or longer, Number of Issues | issue | 3 | 3
12 months or longer, Fair Value | $ 127 | $ 115
12 months or longer, Gross Unrealized Depreciation | 181 | 193
Total, Fair Value | 127 | 115
Total, Gross Unrealized Depreciation | $ 181 | $ 193
Common Stocks [Member] | Energy [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 8 | 10
Less than 12 months, Fair Value | $ 1,935 | $ 2,868
Less than 12 months, Gross Unrealized Depreciation | $ 158 | $ 266
12 months or longer, Number of Issues | issue | 0 | 0
12 months or longer, Fair Value | $ 0 | $ 0
12 months or longer, Gross Unrealized Depreciation | 0 | 0
Total, Fair Value | 1,935 | 2,868
Total, Gross Unrealized Depreciation | $ 158 | $ 266
Common Stocks [Member] | Industrials [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 2 | 3
Less than 12 months, Fair Value | $ 1 | $ 177
Less than 12 months, Gross Unrealized Depreciation | $ 1 | $ 44
12 months or longer, Number of Issues | issue | 5 | 5
12 months or longer, Fair Value | $ 231 | $ 193
12 months or longer, Gross Unrealized Depreciation | 231 | 269
Total, Fair Value | 232 | 370
Total, Gross Unrealized Depreciation | $ 232 | $ 313
Common Stocks [Member] | Consumer Goods and Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 2 | 0
Less than 12 months, Fair Value | $ 32 | $ 0
Less than 12 months, Gross Unrealized Depreciation | $ 1 | $ 0
12 months or longer, Number of Issues | issue | 2 | 2
12 months or longer, Fair Value | $ 13 | $ 14
12 months or longer, Gross Unrealized Depreciation | 4 | 3
Total, Fair Value | 45 | 14
Total, Gross Unrealized Depreciation | $ 5 | $ 3
Common Stocks [Member] | Technology, Media and Telecommunications [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 7 | 9
Less than 12 months, Fair Value | $ 488 | $ 438
Less than 12 months, Gross Unrealized Depreciation | $ 40 | $ 91
12 months or longer, Number of Issues | issue | 5 | 2
12 months or longer, Fair Value | $ 31 | $ 12
12 months or longer, Gross Unrealized Depreciation | 17 | 14
Total, Fair Value | 519 | 450
Total, Gross Unrealized Depreciation | $ 57 | $ 105
Common Stocks [Member] | Financial Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Less than 12 months, Number of Issues | issue | 6 | 6
Less than 12 months, Fair Value | $ 408 | $ 326
Less than 12 months, Gross Unrealized Depreciation | $ 29 | $ 51
12 months or longer, Number of Issues | issue | 2 | 1
12 months or longer, Fair Value | $ 150 | $ 136
12 months or longer, Gross Unrealized Depreciation | 64 | 58
Total, Fair Value | 558 | 462
Total, Gross Unrealized Depreciation | $ 93 | $ 109

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