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General (Details 7) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost    
Investments amortized cost maturity dates 2015 $ 110,723  
Investments amortized cost maturity dates 2016 258,579  
Investments amortized cost maturity dates 2017 1,686  
Amortized Cost 370,988 $ 267,891
Estimated Fair Value    
Investments fair value maturity dates 2015 110,679  
Investments fair value maturity dates 2016 258,439  
Investments fair value maturity dates 2017 1,687  
Estimated Fair Value $ 370,805 $ 267,654