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Income Taxes (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total Income Tax Expenses [Line Items]      
Income from continuing operations $ 4,520 $ 10,671 $ 11,405
Other comprehensive income (loss) (25) 6 (168)
Excess tax benefits allocated to additional paid-in capital from share-based compensation     (771)
Retained earnings for previously unrecognized excess tax benefits   (141)  
Total income tax expense $ 4,495 $ 10,536 $ 10,466