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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 4,888 $ 5,665
Income tax benefit (1,655) (1,882)
Share-based compensation expense, net of tax 3,233 3,783
Cash awards 151 172
Stock Option and Stock Purchase Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1,873 2,301
Nonvested Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 3,015 $ 3,364