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Investments (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost, Due in less than one year $ 25,963  
Amortized cost, Due after one year but within five years 182,604  
Amortized cost, Due after five years but within ten years 89,280  
Amortized cost, Due after ten years 68,182  
Amortized cost 366,487 $ 350,029
Amortized cost, Total 366,487  
Estimated fair value, Due in less than one year 26,067  
Estimated fair value, Due after one year but within five years 184,791  
Estimated fair value, Due after five years but within ten years 92,434  
Estimated fair value, Due after ten years 70,132  
Estimated fair value, Total 374,426 353,438
Common Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 458 580
Estimated fair value, Total $ 1,002 $ 1,486