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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Stock-based compensation expense $ 27,014 $ 24,582 $ 23,805
Less: Deferred tax benefit (5,182) (4,814) (5,078)
Stock-based compensation expense, net of tax $ 21,832 $ 19,768 $ 18,727