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Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current $ 10,805 $ 4,601
Held-to-maturity Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current 10,805 4,601
Amortized Cost, Due from one through five years 10,602 12,133
Amortized Cost, Due from six through ten years 6,365 7,705
Amortized Cost, Due from eleven through twenty years 2,269 1,223
Amortized Cost, Total 30,041 25,662
Market Value, Current 10,820 4,610
Market Value, Due from one through five years 10,975 12,486
Market Value, Due from six through ten years 6,635 7,804
Market Value, Due from eleven through twenty years 2,347 1,222
Market Value, Total $ 30,777 $ 26,122