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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 5,504 $ 5,131 $ 11,169 $ 9,989
Income tax benefit (1,860) (1,713) (3,743) (3,389)
Share-based compensation expense, net of tax 3,644 3,418 7,426 6,600
Cash awards 281 743 464 1,266
Stock Option and Stock Purchase Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,956 2,241 4,257 4,478
Nonvested Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 3,548 $ 2,890 $ 6,912 $ 5,511