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Investments (Details 3) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Estimated expected maturity:    
Due in 1 year or less, Amortized Cost $ 199,830  
Due in 1 year or less, Fair Value $ 211,874  
Due in 1 year or less, Percent of Total Fair Value 3.10% 4.00%
Due after 1 year through 5 years, Amortized Cost $ 1,532,701  
Due after 1 year through 5 years, Fair Value $ 1,625,073  
Due after 1 year through 5 years, Percent of Total Fair Value 23.60% 23.40%
Due after 5 years through 10 years, Amortized Cost $ 2,545,277  
Due after 5 years through 10 years, Fair Value $ 2,698,675  
Due after 5 years through 10 years, Percent of Total Fair Value 39.10% 40.10%
Due after 10 years through 20 years, Amortized Cost $ 1,387,929  
Due after 10 years through 20 years, Fair Value $ 1,471,576  
Due after 10 years through 20 years, Percent of Total Fair Value 21.30% 20.10%
Due after 20 years, Amortized Cost $ 839,279  
Due after 20 years, Fair Value $ 889,860  
Due after 20 years, Percent of Total Fair Value 12.90% 12.40%
Total, Amortized Cost [1] $ 6,505,016 $ 6,375,237
Fair Value [1] $ 6,897,058 $ 6,893,090
Total, Percent of Total Fair Value 100.00% 100.00%
Average option-adjusted duration, in years 5 years 10 months 24 days 5 years 9 months 18 days
[1] Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $252,549 and $302,222; Federal Home Loan Mortgage Corporation (“FHLMC”) of $435,304 and $432,432; and Government National Mortgage Association (“GNMA”) of $136,356 and $137,867 as of June 30, 2015 and December 31, 2014, respectively.