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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 4,943 $ 5,457 $ 16,112 $ 15,446
Income tax benefit (1,652) (1,864) (5,395) (5,253)
Share-based compensation expense, net of tax 3,291 3,593 10,717 10,193
Cash awards 197 389 661 1,655
Stock Option and Stock Purchase Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,948 2,353 6,205 6,831
Nonvested Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,995 $ 3,104 $ 9,907 $ 8,615