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Stock-Based Incentive Plans (Summary of Performance-Based Restricted Stock and Restricted Stock Unit Activity) (Details) - Operating performance-based restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of performance and market-based restricted share units granted during the year (in dollars per share) $ 89.29 $ 41.70 $ 98.50
Aggregate fair value of performance and market-based restricted share units that vested during the year (in thousands) $ 8,268 $ 4,106 $ 6,697