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STOCK-BASED COMPENSATION - Total Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Pre-tax stock-based compensation expense $ 1,251 $ 2,691 $ 3,610 $ 5,127
Less: income tax effect (275) (592) (794) (1,128)
Net stock-based compensation expense 976 2,099 2,816 3,999
Unrecognized compensation cost related to non-vested stock-based compensation arrangements 9,600   $ 9,600  
Period for recognition for which unrecognized compensation costs are expected to be recognized     1 year 9 months 18 days  
Costs of sales        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Pre-tax stock-based compensation expense 250 516 $ 778 1,047
Operating expenses        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Pre-tax stock-based compensation expense $ 1,001 $ 2,175 $ 2,832 $ 4,080