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Schedule of Pre-Tax Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense $ 21,336 $ 22,021 $ 22,036
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense 21,058 18,965 17,299
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense 278 2,917 4,529
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense $ 0 $ 139 $ 208