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Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Estimated expected maturity:    
Due in 1 year or less, Amortized Cost $ 268,346  
Due in 1 year or less, Fair Value 288,311  
Due in 1 year or less, Percent of Total Fair Value 4.20% 4.10%
Due after 1 year through 5 years, Amortized Cost 1,513,450  
Due after 1 year through 5 years, Fair Value 1,626,049  
Due after 1 year through 5 years, Percent of Total Fair Value 23.90% 20.90%
Due after 5 years through 10 years, Amortized Cost 2,530,472  
Due after 5 years through 10 years, Fair Value 2,718,736  
Due after 5 years through 10 years, Percent of Total Fair Value 40.10% 38.40%
Due after 10 years through 20 years, Amortized Cost 1,201,781  
Due after 10 years through 20 years, Fair Value 1,291,192  
Due after 10 years through 20 years, Percent of Total Fair Value 19.00% 20.80%
Due after 20 years, Amortized Cost 808,993  
Due after 20 years, Fair Value 869,181  
Due after 20 years, Percent of Total Fair Value 12.80% 15.80%
Total, Amortized Cost 6,323,042 5,784,205
Fair Value $ 6,793,469 $ 6,009,573
Total, Percent of Total Fair Value 100.00% 100.00%
Average option-adjusted duration, in years 5 years 10 months 24 days 6 years 3 months 18 days