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Investments - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Amortized cost, Due in less than one year $ 30,111  
Amortized cost, Due after one year but within five years 182,277  
Amortized cost, Due after five years but within ten years 90,785  
Amortized cost, Due after ten years 83,966  
Amortized cost, Common stocks 178  
Amortized cost, Total 387,317 $ 387,733
Estimated fair value, Due in less than one year 30,139  
Estimated fair value, Due after one year but within five years 182,573  
Estimated fair value, Due after five years but within ten years 92,095  
Estimated fair value, Due after ten years 84,676  
Estimated fair value, Common stocks 359  
Estimated fair value, Total $ 389,842 $ 385,563