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Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current $ 3,281 $ 4,522
Municipal Bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost, Current 3,281 4,522
Amortized Cost, Due from one through five years 13,726 12,395
Amortized Cost, Due from six through ten years 6,966 6,929
Amortized Cost, Due from eleven through twenty years 770 1,361
Amortized Cost, Total 24,743 25,207
Market Value, Current 3,300 4,546
Market Value, Due from one through five years 14,466 13,057
Market Value, Due from six through ten years 7,468 7,217
Market Value, Due from eleven through twenty years 807 1,391
Market Value, Total $ 26,041 $ 26,211