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General - Investments by Matuirity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortized Cost    
Investments amortized cost maturity dates 2016 $ 215,467  
Investments amortized cost maturity dates 2017 69,737  
Investment amortized cost maturity dates 2018 2,495  
Amortized Cost 287,699 $ 326,589
Estimated Fair Value    
Investments fair value maturity dates 2016 215,426  
Investments fair value maturity dates 2017 69,730  
Investments fair value maturity dates 2018 2,502  
Estimated Fair Value $ 287,658 $ 326,165