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General - Investments by Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amortized Cost    
Investments amortized cost maturity dates 2017 $ 180,496  
Investments amortized cost maturity dates 2018 123,956  
Investment amortized cost maturity dates 2019 4,664  
Amortized Cost 309,116 $ 305,540
Estimated Fair Value    
Investments fair value maturity dates 2017 180,389  
Investments fair value maturity dates 2018 123,780  
Investments fair value maturity dates 2019 4,662  
Estimated Fair Value $ 308,831 $ 305,253