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Share-Based Compensation Plans - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based compensation expense and income tax benefits recognized during the periods      
Share-based compensation expense $ 25,828 $ 24,952 $ 18,967
Income tax benefit (4,667) (4,615) (6,628)
Share-based compensation expense, net of tax 21,161 20,337 12,339
Stock option and stock purchase plans      
Share-based compensation expense and income tax benefits recognized during the periods      
Share-based compensation expense 6,575 7,703 7,869
Unvested stock awards      
Share-based compensation expense and income tax benefits recognized during the periods      
Share-based compensation expense $ 19,253 $ 17,249 $ 11,098