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Investments (Schedule of Available for Sale Securities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis $ 6,132,246 $ 6,352,737
Gross unrealized gain 204,765 280,620
Gross unrealized loss (40,755) (22,989)
Fixed maturity securities - available for sale 6,296,256 6,610,368
Available for sale equity securities    
Available-for-sale Equity Securities, Amortized Cost Basis 382,550 291,070
Gross unrealized gain 29,918 24,069
Gross unrealized loss (22,391) (18,787)
Available-for-sale Securities, Equity Securities 390,077 296,352
US Government and Government Agency Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 73,501 70,279
Gross unrealized gain 697 827
Gross unrealized loss (60) (137)
Fixed maturity securities - available for sale 74,138 70,969
Fixed Maturity Securities of States, Municipalities and Political Subdivisions Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 775,017 896,130
Gross unrealized gain 42,911 58,738
Gross unrealized loss (2,173) (160)
Fixed maturity securities - available for sale 815,755 954,708
Special Purpose Revenue Bonds Of States Municipalities And Political Subdivisions [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 2,240,251 2,246,707
Gross unrealized gain 106,213 143,291
Gross unrealized loss (7,518) (986)
Fixed maturity securities - available for sale 2,338,946 2,389,012
Corporate Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 771,109 777,242
Gross unrealized gain 17,648 25,983
Gross unrealized loss (6,441) (4,656)
Fixed maturity securities - available for sale 782,316 798,569
Residential Mortgage Backed Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 784,457 805,458
Gross unrealized gain 14,943 20,215
Gross unrealized loss (7,363) (3,979)
Fixed maturity securities - available for sale 792,037 821,694
Commercial Mortgage Backed Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 521,110 593,956
Gross unrealized gain 13,853 19,707
Gross unrealized loss (2,274) (2,032)
Fixed maturity securities - available for sale 532,689 611,631
Asset-backed Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 373,117 369,103
Gross unrealized gain 530 316
Gross unrealized loss (856) (2,592)
Fixed maturity securities - available for sale 372,791 366,827
Foreign Government Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 145,905 119,479
Gross unrealized gain 830 767
Gross unrealized loss (1,484) (1,554)
Fixed maturity securities - available for sale 145,251 118,692
Foreign Corporate Securities [Member]    
Fixed Maturity & Equity Securities Available for Sale    
Available-for-sale Fixed Maturity Securities, Amortized Cost Basis 447,779 474,383
Gross unrealized gain 7,140 10,776
Gross unrealized loss (12,586) (6,893)
Fixed maturity securities - available for sale $ 442,333 $ 478,266