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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Income tax expense $ 311 $ 1,824 $ 2,233 $ 2,945  
Effective tax rate 24.50% 51.40% 8.80% 31.10%  
Unrecognized tax benefits $ 4,600   $ 4,600    
Unrecognized tax benefits that would impact effective rate 4,300   4,300    
Accrued interest and penalties $ 600   $ 600   $ 500