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Summary of Investments (Fair Value of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
HELD-TO-MATURITY |  |
Cost or Amortized Cost | $ 664 | $ 672
Fair Value | 667 | 675
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 2,839,442 | 2,861,583
Gross Unrealized Appreciation | 266,074 | 227,716
Gross Unrealized Depreciation | 12,534 | 28,091
Fair Value | 3,092,982 | 3,061,208
Fixed Maturities [Member] |  |
HELD-TO-MATURITY |  |
Cost or Amortized Cost | 664 | 672
Gross Unrealized Appreciation | 3 | 3
Gross Unrealized Depreciation | 0 | 0
Fair Value | 667 | 675
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 2,770,718 | 2,793,069
Gross Unrealized Appreciation | 96,256 | 58,994
Gross Unrealized Depreciation | 11,808 | 27,102
Fair Value | 2,855,166 | 2,824,961
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | Midwest [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 160,686 | 160,484
Gross Unrealized Appreciation | 5,464 | 4,990
Gross Unrealized Depreciation | 14 | 18
Fair Value | 166,136 | 165,456
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | Northeast [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 61,333 | 56,449
Gross Unrealized Appreciation | 2,594 | 1,996
Gross Unrealized Depreciation | 0 | 0
Fair Value | 63,927 | 58,445
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | South [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 119,448 | 125,565
Gross Unrealized Appreciation | 3,971 | 3,358
Gross Unrealized Depreciation | 0 | 134
Fair Value | 123,419 | 128,789
States, Municipalities and Political Subdivisions [Member] | General Obligations [Member] | West [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 106,544 | 103,721
Gross Unrealized Appreciation | 3,949 | 3,160
Gross Unrealized Depreciation | 49 | 67
Fair Value | 110,444 | 106,814
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | Midwest [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 156,902 | 152,780
Gross Unrealized Appreciation | 6,186 | 4,956
Gross Unrealized Depreciation | 0 | 30
Fair Value | 163,088 | 157,706
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | Northeast [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 29,203 | 23,892
Gross Unrealized Appreciation | 1,143 | 919
Gross Unrealized Depreciation | 4 | 212
Fair Value | 30,342 | 24,599
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | South [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 160,498 | 144,183
Gross Unrealized Appreciation | 5,779 | 4,281
Gross Unrealized Depreciation | 7 | 27
Fair Value | 166,270 | 148,437
States, Municipalities and Political Subdivisions [Member] | Special Revenue [Member] | West [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 80,862 | 78,935
Gross Unrealized Appreciation | 3,796 | 3,150
Gross Unrealized Depreciation | 2 | 44
Fair Value | 84,656 | 82,041
Corporate Bonds [Member] | Energy [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 116,341 | 116,800
Gross Unrealized Appreciation | 1,763 | 1,032
Gross Unrealized Depreciation | 3,422 | 4,713
Fair Value | 114,682 | 113,119
Corporate Bonds [Member] | Industrials [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 239,448 | 227,589
Gross Unrealized Appreciation | 7,950 | 3,329
Gross Unrealized Depreciation | 3,276 | 6,663
Fair Value | 244,122 | 224,255
Corporate Bonds [Member] | Consumer Goods and Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 176,258 | 172,529
Gross Unrealized Appreciation | 7,529 | 2,844
Gross Unrealized Depreciation | 3 | 776
Fair Value | 183,784 | 174,597
Corporate Bonds [Member] | Health Care [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 87,699 | 92,132
Gross Unrealized Appreciation | 3,870 | 2,168
Gross Unrealized Depreciation | 43 | 791
Fair Value | 91,526 | 93,509
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member] |  |
HELD-TO-MATURITY |  |
Cost or Amortized Cost | 450 | 450
Gross Unrealized Appreciation | 2 | 1
Gross Unrealized Depreciation | 0 | 0
Fair Value | 452 | 451
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 141,213 | 142,431
Gross Unrealized Appreciation | 4,394 | 1,972
Gross Unrealized Depreciation | 1,070 | 2,003
Fair Value | 144,537 | 142,400
Corporate Bonds [Member] | Financial Services [Member] |  |
HELD-TO-MATURITY |  |
Cost or Amortized Cost | 150 | 150
Gross Unrealized Appreciation | 0 | 0
Gross Unrealized Depreciation | 0 | 0
Fair Value | 150 | 150
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 252,289 | 259,382
Gross Unrealized Appreciation | 8,961 | 5,246
Gross Unrealized Depreciation | 228 | 1,143
Fair Value | 261,022 | 263,485
Mortgage-Backed Securities [Member] |  |
HELD-TO-MATURITY |  |
Cost or Amortized Cost | 64 | 72
Gross Unrealized Appreciation | 1 | 2
Gross Unrealized Depreciation | 0 | 0
Fair Value | 65 | 74
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 15,352 | 16,413
Gross Unrealized Appreciation | 464 | 376
Gross Unrealized Depreciation | 17 | 51
Fair Value | 15,799 | 16,738
U.S. Treasury [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 23,783 | 21,587
Gross Unrealized Appreciation | 303 | 100
Gross Unrealized Depreciation | 3 | 38
Fair Value | 24,083 | 21,649
U.S. Government Agency [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 176,116 | 232,808
Gross Unrealized Appreciation | 3,728 | 2,622
Gross Unrealized Depreciation | 28 | 2,400
Fair Value | 179,816 | 233,030
Foreign Bonds [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 80,115 | 82,580
Gross Unrealized Appreciation | 2,555 | 2,405
Gross Unrealized Depreciation | 1,925 | 2,457
Fair Value | 80,745 | 82,528
Public Utilities [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 215,122 | 213,233
Gross Unrealized Appreciation | 7,624 | 3,701
Gross Unrealized Depreciation | 826 | 1,251
Fair Value | 221,920 | 215,683
Government National Mortgage Association [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 123,776 | 120,220
Gross Unrealized Appreciation | 3,716 | 1,391
Gross Unrealized Depreciation | 403 | 1,985
Fair Value | 127,089 | 119,626
Federal Home Loan Mortgage Corporation [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 134,375 | 137,874
Gross Unrealized Appreciation | 5,285 | 2,377
Gross Unrealized Depreciation | 149 | 1,342
Fair Value | 139,511 | 138,909
Federal National Mortgage Association [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 108,566 | 106,021
Gross Unrealized Appreciation | 4,994 | 2,400
Gross Unrealized Depreciation | 127 | 941
Fair Value | 113,433 | 107,480
Asset-Backed Securities [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 4,789 | 5,461
Gross Unrealized Appreciation | 238 | 221
Gross Unrealized Depreciation | 212 | 16
Fair Value | 4,815 | 5,666
Equity Securities [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 68,724 | 68,514
Gross Unrealized Appreciation | 169,818 | 168,722
Gross Unrealized Depreciation | 726 | 989
Fair Value | 237,816 | 236,247
Common Stocks [Member] | Public Utilities [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 7,231 | 7,231
Gross Unrealized Appreciation | 14,893 | 12,022
Gross Unrealized Depreciation | 181 | 193
Fair Value | 21,943 | 19,060
Common Stocks [Member] | Energy [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 6,514 | 6,103
Gross Unrealized Appreciation | 6,409 | 5,374
Gross Unrealized Depreciation | 158 | 266
Fair Value | 12,765 | 11,211
Common Stocks [Member] | Industrials [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 13,252 | 13,251
Gross Unrealized Appreciation | 32,722 | 31,872
Gross Unrealized Depreciation | 232 | 313
Fair Value | 45,742 | 44,810
Common Stocks [Member] | Consumer Goods and Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 10,301 | 10,301
Gross Unrealized Appreciation | 13,978 | 13,017
Gross Unrealized Depreciation | 5 | 3
Fair Value | 24,274 | 23,315
Common Stocks [Member] | Health Care [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 7,763 | 7,763
Gross Unrealized Appreciation | 19,108 | 20,454
Gross Unrealized Depreciation | 0 | 0
Fair Value | 26,871 | 28,217
Common Stocks [Member] | Technology, Media and Telecommunications [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 5,931 | 5,931
Gross Unrealized Appreciation | 8,550 | 7,538
Gross Unrealized Depreciation | 57 | 105
Fair Value | 14,424 | 13,364
Common Stocks [Member] | Financial Services [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 17,289 | 17,392
Gross Unrealized Appreciation | 74,132 | 78,411
Gross Unrealized Depreciation | 93 | 109
Fair Value | 91,328 | 95,694
Nonredeemable Preferred Stocks [Member] |  |
AVAILABLE-FOR-SALE |  |
Cost or Amortized Cost | 443 | 542
Gross Unrealized Appreciation | 26 | 34
Gross Unrealized Depreciation | 0 | 0
Fair Value | $ 469 | $ 576

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