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Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current $ 11,354 $ 4,601
Held-to-maturity Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current 11,354 4,601
Amortized Cost, Due from one through five years 9,819 12,133
Amortized Cost, Due from six through ten years 5,789 7,705
Amortized Cost, Due from eleven through twenty years 2,665 1,223
Amortized Cost, Total 29,627 25,662
Market Value, Current 11,380 4,610
Market Value, Due from one through five years 10,157 12,486
Market Value, Due from six through ten years 6,050 7,804
Market Value, Due from eleven through twenty years 2,763 1,222
Market Value, Total $ 30,350 $ 26,122