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Income Taxes (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income taxes      
Valuation allowance $ 28,350 $ 40,148 $ 9,958
Unrecognized tax benefits that would impact effective tax rate 200    
Interest and penalties 0 0  
Interest and penalties accrued 0 0  
Income Taxes Paid, Net $ 32,914 $ 2,592 $ 10,069
Minimum      
Income taxes      
Open Tax Year 2013