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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 13,334,032 $ 13,102,142
Loans receivable 611,378 669,200
Arbitrage trading account 753,278 299,999
Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 13,334,032 13,102,142
Loans receivable 611,378 669,200
Assets, fair value disclosure 14,698,688 14,071,341
Arbitrage trading account 753,278 299,999
Securities sold but not yet purchased 51,348 51,179
Fair Value, Measurements, Recurring [Member] | U.S. government and government agency    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 486,676 513,802
Fair Value, Measurements, Recurring [Member] | State and municipal    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,461,086 4,519,503
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,211,634 1,189,645
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 2,028,169 1,907,860
Fair Value, Measurements, Recurring [Member] | Corporate    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,244,796 4,068,527
Fair Value, Measurements, Recurring [Member] | Foreign government    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 901,671 902,805
Fair Value, Measurements, Recurring [Member] | Common stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 421,329 445,858
Fair Value, Measurements, Recurring [Member] | Preferred stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 190,049 223,342
Level 1 | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Loans receivable 403,855 429,647
Assets, fair value disclosure 660,607 654,270
Arbitrage trading account 256,752 224,623
Securities sold but not yet purchased 51,348 51,089
Level 1 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | State and municipal    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Corporate    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign government    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Common stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 403,855 429,647
Level 1 | Fair Value, Measurements, Recurring [Member] | Preferred stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 0 0
Level 2 | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 13,333,853 13,101,959
Loans receivable 195,058 227,137
Assets, fair value disclosure 14,025,376 13,404,472
Arbitrage trading account 496,465 75,376
Securities sold but not yet purchased 0 90
Level 2 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 486,676 513,802
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,461,086 4,519,503
Level 2 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,211,634 1,189,645
Level 2 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 2,027,990 1,907,677
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,244,796 4,068,527
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign government    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 901,671 902,805
Level 2 | Fair Value, Measurements, Recurring [Member] | Common stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 8,671 7,457
Level 2 | Fair Value, Measurements, Recurring [Member] | Preferred stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 186,387 219,680
Level 3 | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 179 183
Loans receivable 12,465 12,416
Assets, fair value disclosure 12,705 12,599
Arbitrage trading account 61 0
Securities sold but not yet purchased 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | State and municipal    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 179 183
Level 3 | Fair Value, Measurements, Recurring [Member] | Corporate    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Foreign government    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Common stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 8,803 8,754
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Loans receivable $ 3,662 $ 3,662