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Schedule of Pre-Tax Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 5,139 $ 5,592 $ 17,582 $ 16,983
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense 5,139 5,546 17,576 16,871
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 0 $ 46 $ 6 $ 112