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Share-Based Compensation Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based compensation expense and income tax benefits recognized during the periods      
Non-operating pension costs and share-based compensation expense $ 24,952 $ 18,967 $ 18,664
Income tax benefit (4,615) (6,628) (6,644)
Share-based compensation expense, net of tax 20,337 12,339 12,020
Stock option and stock purchase plans      
Share-based compensation expense and income tax benefits recognized during the periods      
Stock option and stock purchase plans and unvested stock awards 7,703 7,869 7,244
Unvested stock awards      
Share-based compensation expense and income tax benefits recognized during the periods      
Stock option and stock purchase plans and unvested stock awards $ 17,249 $ 11,098 $ 11,420