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Summary of Investments (Fair Value of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost $ 413 $ 656
Fair Value 421 669
Available-for-sale Securities [Abstract]    
Amortized Cost 2,836,043 2,804,514
Gross Unrealized Appreciation 244,971 235,940
Gross Unrealized Depreciation 20,403 59,830
Fair Value 3,060,611 2,980,624
Fixed Maturities [Member]
    
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost 413 656
Gross Unrealized Appreciation 8 13
Gross Unrealized Depreciation 0 0
Fair Value 421 669
Available-for-sale Securities [Abstract]    
Amortized Cost 2,764,358 2,733,557
Gross Unrealized Appreciation 82,507 77,082
Gross Unrealized Depreciation 20,222 59,383
Fair Value 2,826,643 2,751,256
U.S. Treasury [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 31,168 33,612
Gross Unrealized Appreciation 198 423
Gross Unrealized Depreciation 129 140
Fair Value 31,237 33,895
U.S. Government Agency [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 380,763 287,988
Gross Unrealized Appreciation 2,872 258
Gross Unrealized Depreciation 6,247 18,663
Fair Value 377,388 269,583
States, Municipalities and Political Subdivisions [Member]
    
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost 55 250
Gross Unrealized Appreciation 1 4
Gross Unrealized Depreciation 0 0
Fair Value 56 254
Available-for-sale Securities [Abstract]    
Amortized Cost 727,929 690,461
Gross Unrealized Appreciation 32,731 34,151
Gross Unrealized Depreciation 1,302 10,705
Fair Value 759,358 713,907
Foreign Bonds [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 139,849 167,390
Gross Unrealized Appreciation 5,709 5,863
Gross Unrealized Depreciation 0 397
Fair Value 145,558 172,856
Public Utilities [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 212,716 213,479
Gross Unrealized Appreciation 6,623 6,873
Gross Unrealized Depreciation 295 1,776
Fair Value 219,044 218,576
Corporate Bonds [Member] | Energy [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 135,428 157,620
Gross Unrealized Appreciation 4,360 4,398
Gross Unrealized Depreciation 314 1,008
Fair Value 139,474 161,010
Corporate Bonds [Member] | Industrials [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 203,976 234,221
Gross Unrealized Appreciation 6,460 5,626
Gross Unrealized Depreciation 1,222 2,819
Fair Value 209,214 237,028
Corporate Bonds [Member] | Consumer Goods and Services [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 157,073 165,565
Gross Unrealized Appreciation 4,293 3,770
Gross Unrealized Depreciation 395 1,421
Fair Value 160,971 167,914
Corporate Bonds [Member] | Health Care [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 78,257 91,008
Gross Unrealized Appreciation 3,270 3,138
Gross Unrealized Depreciation 281 1,200
Fair Value 81,246 92,946
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 131,910 121,746
Gross Unrealized Appreciation 3,562 2,541
Gross Unrealized Depreciation 1,063 3,321
Fair Value 134,409 120,966
Corporate Bonds [Member] | Financial Services [Member]
    
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost 200 200
Gross Unrealized Appreciation 0 0
Gross Unrealized Depreciation 0 0
Fair Value 200 200
Available-for-sale Securities [Abstract]    
Amortized Cost 218,530 234,739
Gross Unrealized Appreciation 8,515 7,735
Gross Unrealized Depreciation 224 723
Fair Value 226,821 241,751
Mortgage-Backed Securities [Member]
    
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost 158 206
Gross Unrealized Appreciation 7 9
Gross Unrealized Depreciation 0 0
Fair Value 165 215
Available-for-sale Securities [Abstract]    
Amortized Cost 18,343 22,034
Gross Unrealized Appreciation 493 323
Gross Unrealized Depreciation 120 291
Fair Value 18,716 22,066
Collateralized Mortgage Obligations [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 325,551 309,975
Gross Unrealized Appreciation 3,150 1,707
Gross Unrealized Depreciation 8,630 16,919
Fair Value 320,071 294,763
Asset-Backed Securities [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 2,865 3,719
Gross Unrealized Appreciation 271 276
Gross Unrealized Depreciation 0 0
Fair Value 3,136 3,995
Equity Securities [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 71,685 70,957
Gross Unrealized Appreciation 162,464 158,858
Gross Unrealized Depreciation 181 447
Fair Value 233,968 229,368
Common Stocks [Member] | Public Utilities [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 7,231 7,231
Gross Unrealized Appreciation 10,393 9,068
Gross Unrealized Depreciation 10 27
Fair Value 17,614 16,272
Common Stocks [Member] | Energy [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 5,094 5,094
Gross Unrealized Appreciation 9,990 9,269
Gross Unrealized Depreciation 0 0
Fair Value 15,084 14,363
Common Stocks [Member] | Industrials [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 13,284 13,308
Gross Unrealized Appreciation 31,614 32,823
Gross Unrealized Depreciation 55 32
Fair Value 44,843 46,099
Common Stocks [Member] | Consumer Goods and Services [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 10,287 10,363
Gross Unrealized Appreciation 11,982 10,895
Gross Unrealized Depreciation 4 0
Fair Value 22,265 21,258
Common Stocks [Member] | Health Care [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 7,920 7,920
Gross Unrealized Appreciation 19,254 17,078
Gross Unrealized Depreciation 0 0
Fair Value 27,174 24,998
Common Stocks [Member] | Technology, Media and Telecommunications [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 6,207 6,204
Gross Unrealized Appreciation 7,925 7,183
Gross Unrealized Depreciation 51 83
Fair Value 14,081 13,304
Common Stocks [Member] | Financial Services [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 16,678 15,853
Gross Unrealized Appreciation 71,272 72,537
Gross Unrealized Depreciation 55 128
Fair Value 87,895 88,262
Nonredeemable Preferred Stocks [Member]
    
Available-for-sale Securities [Abstract]    
Amortized Cost 4,984 4,984
Gross Unrealized Appreciation 34 5
Gross Unrealized Depreciation 6 177
Fair Value $ 5,012 $ 4,812