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Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Income Tax Expense (Benefit)      
Federal $ 622 $ 0 $ 0
State 1,221 1,297 770
Foreign 662 697 515
Current Income Tax Expense (Benefit) 2,505 1,994 1,285
Deferred Income Tax Expense (Benefit)      
Federal 6,432 9,779 8,249
State 425 1,324 2,315
Foreign 845 (698) (274)
Deferred Income Tax Expense (Benefit) 7,702 10,405 10,290
Income tax provision $ 10,207 $ 12,399 $ 11,575