XML 41 R29.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investments - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Amortized cost, Due in less than one year $ 28,765  
Amortized cost, Due after one year but within five years 176,397  
Amortized cost, Due after five years but within ten years 97,814  
Amortized cost, Due after ten years 84,737  
Amortized cost, Common stocks 162  
Amortized cost, Total 387,875 $ 387,733
Estimated fair value, Due in less than one year 28,794  
Estimated fair value, Due after one year but within five years 176,366  
Estimated fair value, Due after five years but within ten years 98,668  
Estimated fair value, Due after ten years 85,237  
Estimated fair value, Common stocks 323  
Estimated fair value, Total $ 389,388 $ 385,563