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General - Investments by Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Investments amortized cost maturity dates 2017 $ 98,136  
Investments amortized cost maturity dates 2018 216,697  
Investment amortized cost maturity dates 2019 8,886  
Amortized Cost 323,719 $ 305,540
Estimated Fair Value    
Investments fair value maturity dates 2017 98,105  
Investments fair value maturity dates 2018 216,498  
Investments fair value maturity dates 2019 8,874  
Estimated Fair Value $ 323,477 $ 305,253