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Stock Based Compensation Table of Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Income tax benefit $ (2,316) $ (912) $ (154)
Net stock-based compensation expense 4,244 1,672 283
Payroll and employee commissions      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Allocated Share-based Compensation Expense 6,560 2,441 304
Professional fees expense      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Allocated Share-based Compensation Expense [1] $ 0 $ 143 $ 133
[1] Professional fees consist of the value of restricted stock units and options granted to our Executive Chairman providing services to the Company under the TSA. See (21) Related Party Transactions.