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Stock-Based Compensation Plans Compensation Costs from Equity Awards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Compensation costs from the Company's stock-based awards $ 17,634 $ 17,477 $ 17,888
Income tax benefit recognized 3,437 3,430 5,296
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 1,729 $ 3,136 $ 2,135
Compensation costs related to non-vested awards not yet recognized $ 19,900    
Period over which non-vested awards will be recognized 3 years    
Weighted average period over which non-vested awards will be recognized 1 year 4 months 29 days