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Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current $ 2,778 $ 4,522
Municipal Bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current 2,778 4,522
Amortized Cost, Due from one through five years 13,808 12,395
Amortized Cost, Due from six through ten years 7,501 6,929
Amortized Cost, Due from eleven through twenty years 474 1,361
Amortized Cost, Total 24,561 25,207
Market Value, Current 2,797 4,546
Market Value, Due from one through five years 14,412 13,057
Market Value, Due from six through ten years 7,970 7,217
Market Value, Due from eleven through twenty years 486 1,391
Market Value, Total $ 25,665 $ 26,211