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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
State $ 5,010 $ 486 $ 2,700
Foreign 1,303 1,171 482
Current provision for income taxes 6,313 1,657 3,182
Deferred:      
State 111 (805)  
Foreign (570)    
Deferred provision for income taxes (459) (805)  
Provision (benefit) for income taxes $ 5,854 $ 852 $ 3,182