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Summary of Investments (Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Held-To-Maturity, Amortized Cost    
Due in one year or less $ 55  
Due after one year through five years 200  
Due after five years through 10 years 0  
Due after 10 years 0  
Amortized Cost 413 656
Held-To-Maturity, Fair Value    
Due in one year or less 56  
Due after one year through five years 200  
Due after five years through 10 years 0  
Due after 10 years 0  
Fair Value 421 669
Available-For-Sale, Amortized Cost    
Due in one year or less 252,688  
Due after one year through five years 853,979  
Due after five years through 10 years 798,893  
Due after 10 years 512,039  
Amortized Cost 2,836,043 2,804,514
Available-For-Sale, Fair Value    
Due in one year or less 256,818  
Due after one year through five years 896,360  
Due after five years through 10 years 818,023  
Due after 10 years 513,519  
Fair Value 3,060,611 2,980,624
Trading, Amortized Cost    
Due in one year or less 2,173  
Due after one year through five years 6,107  
Due after five years through 10 years 1,903  
Due after 10 years 4,673  
Amortized Cost 14,856 8,049
Trading, Fair Value    
Due in one year or less 2,428  
Due after one year through five years 7,107  
Due after five years through 10 years 2,199  
Due after 10 years 5,707  
Fair Value 17,441 9,940
Asset-Backed Securities [Member]
    
Held-To-Maturity, Amortized Cost    
Securities not categorized by contractual maturity 0  
Held-To-Maturity, Fair Value    
Securities not categorized by contractual maturity 0  
Available-For-Sale, Amortized Cost    
Securities not categorized by contractual maturity 2,865  
Amortized Cost 2,865 3,719
Available-For-Sale, Fair Value    
Securities not categorized by contractual maturity 3,136  
Fair Value 3,136 3,995
Mortgage-Backed Securities [Member]
    
Held-To-Maturity, Amortized Cost    
Securities not categorized by contractual maturity 158  
Amortized Cost 158 206
Held-To-Maturity, Fair Value    
Securities not categorized by contractual maturity 165  
Fair Value 165 215
Available-For-Sale, Amortized Cost    
Securities not categorized by contractual maturity 18,343  
Amortized Cost 18,343 22,034
Available-For-Sale, Fair Value    
Securities not categorized by contractual maturity 18,716  
Fair Value 18,716 22,066
Collateralized Mortgage Obligations [Member]
    
Held-To-Maturity, Amortized Cost    
Securities not categorized by contractual maturity 0  
Held-To-Maturity, Fair Value    
Securities not categorized by contractual maturity 0  
Available-For-Sale, Amortized Cost    
Securities not categorized by contractual maturity 325,551  
Amortized Cost 325,551 309,975
Available-For-Sale, Fair Value    
Securities not categorized by contractual maturity 320,071  
Fair Value 320,071 294,763
Fixed Maturities [Member]
    
Held-To-Maturity, Amortized Cost    
Amortized Cost 413 656
Held-To-Maturity, Fair Value    
Fair Value 421 669
Available-For-Sale, Amortized Cost    
Amortized Cost 2,764,358 2,733,557
Available-For-Sale, Fair Value    
Fair Value 2,826,643 2,751,256
Trading, Amortized Cost    
Amortized Cost 14,856  
Trading, Fair Value    
Fair Value $ 17,441