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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,958,250,000 $ 3,831,327,000
Unrealized Gains 156,602,000 128,951,000
Unrealized Losses (13,304,000) (51,971,000)
Total AFS securities 4,101,548,000 3,908,307,000
AFS Fixed Income Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,792,036,000 3,675,977,000
Unrealized Gains 111,465,000 91,434,000
Unrealized Losses (13,301,000) (51,875,000)
Total AFS securities 3,890,200,000 3,715,536,000
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 149,537,000 163,218,000
Unrealized Gains 9,474,000 10,661,000
Unrealized Losses (202,000) (504,000)
Total AFS securities 158,809,000 173,375,000
AFS Fixed Income Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 27,046,000 29,781,000
Unrealized Gains 983,000 906,000
Unrealized Losses (1,000) (72,000)
Total AFS securities 28,028,000 30,615,000
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,080,039,000 946,455,000
Unrealized Gains 30,696,000 25,194,000
Unrealized Losses (3,681,000) (20,025,000)
Total AFS securities 1,107,054,000 951,624,000
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,730,192,000 1,707,928,000
Unrealized Gains 56,587,000 44,004,000
Unrealized Losses (4,186,000) (17,049,000)
Total AFS securities 1,782,593,000 1,734,883,000
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 131,434,000 140,430,000
Unrealized Gains 945,000 934,000
Unrealized Losses (210,000) (468,000)
Total AFS securities 132,169,000 140,896,000
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 170,298,000 [1] 172,288,000 [1]
Unrealized Gains 3,246,000 [1] 2,462,000 [1]
Unrealized Losses (1,073,000) [1] (3,466,000) [1]
Total AFS securities 172,471,000 [1] 171,284,000 [1]
Government guaranteed agency securities fair value 23,700,000 30,000,000
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 503,490,000 [2] 515,877,000 [2]
Unrealized Gains 9,534,000 [2] 7,273,000 [2]
Unrealized Losses (3,948,000) [2] (10,291,000) [2]
Total AFS securities 509,076,000 [2] 512,859,000 [2]
Government guaranteed agency securities fair value 41,800,000 55,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 166,214,000 155,350,000
Unrealized Gains 45,137,000 37,517,000
Unrealized Losses (3,000) (96,000)
Total AFS securities $ 211,348,000 $ 192,771,000
[1] CMBS includes government guaranteed agency securities with a fair value of $23.7 million at June 30, 2014 and $30.0 million at December 31, 2013.
[2] RMBS includes government guaranteed agency securities with a fair value of $41.8 million at June 30, 2014 and $55.2 million at December 31, 2013.