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Stock-Based Compensation (Summary of Activity of Options Outstanding not yet Vested) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation [Abstract]      
Number of Shares, Unvested as of December 31, 2018 2,654    
Number of Shares, Granted 1,068 941 1,171
Number of Shares, Vested (1,072)    
Number of Shares, Forfeited (60)    
Number of Shares, Unvested as of December 31, 2019 2,590 2,654  
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2018 $ 26.05    
Weighted-Average Fair Value Per Share, Granted 33.99 $ 33.01 $ 23.88
Weighted-Average Fair Value Per Share, Vested 24.68    
Weighted-Average Fair Value Per Share, Forfeited 28.65    
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2019 $ 29.82 $ 26.05