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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 4,351,361 $ 4,134,797
Unrealized Gains 90,813 133,303
Unrealized Losses (20,473) (10,578)
Total AFS securities 4,421,701 4,257,522
AFS Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 4,133,223 3,975,786
Unrealized Gains 75,631 100,578
Unrealized Losses (16,036) (10,242)
Total AFS securities 4,192,818 4,066,122
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 109,506 116,666
Unrealized Gains 6,420 7,592
Unrealized Losses (65) (128)
Total AFS securities 115,861 124,130
AFS Fixed Income Securities [Member] | Foreign Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 22,026 27,035
Unrealized Gains 693 796
Unrealized Losses 0 0
Total AFS securities 22,719 27,831
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,277,635 1,208,776
Unrealized Gains 23,242 38,217
Unrealized Losses (4,819) (729)
Total AFS securities 1,296,058 1,246,264
AFS Fixed Income Securities [Member] | Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,794,698 1,763,427
Unrealized Gains 36,201 42,188
Unrealized Losses (6,324) (5,809)
Total AFS securities 1,824,575 1,799,806
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 213,662 176,837
Unrealized Gains 990 760
Unrealized Losses (155) (373)
Total AFS securities 214,497 177,224
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost [1] 213,497 177,932
Unrealized Gains [1] 1,861 2,438
Unrealized Losses [1] (1,180) (777)
Total AFS securities [1] 214,178 179,593
Government guaranteed agency securities fair value 10,200 13,200
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost [2] 502,199 505,113
Unrealized Gains [2] 6,224 8,587
Unrealized Losses [2] (3,493) (2,426)
Total AFS securities [2] 504,930 511,274
Government guaranteed agency securities fair value 25,700 32,400
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 218,138 159,011
Unrealized Gains 15,182 32,725
Unrealized Losses (4,437) (336)
Total AFS securities 228,883 191,400
Equity Securities [Member] | Common Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 200,150 159,011
Unrealized Gains 15,159 32,725
Unrealized Losses (4,190) (336)
Total AFS securities 211,119 $ 191,400
Equity Securities [Member] | Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 17,988  
Unrealized Gains 23  
Unrealized Losses (247)  
Total AFS securities $ 17,764  
[1] CMBS includes government guaranteed agency securities with a fair value of $10.2 million at June 30, 2015 and $13.2 million at December 31, 2014.
[2] RMBS includes government guaranteed agency securities with a fair value of $25.7 million at June 30, 2015 and $32.4 million at December 31, 2014.