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Stock-Based Compensation (Summary of Restricted Stock Unit Activity) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Stock-Based Compensation [Abstract]  
Number of Shares, Outstanding at December 31, 2018 | shares 324
Number of Shares, Granted | shares 134
Number of Shares, Vested | shares (130)
Number of Shares, Forfeited/canceled | shares (15)
Number of Shares, Outstanding at December 31, 2019 | shares 313
Weighted-Average Grant Date Fair Value per Share, Outstanding at December 31, 2018 | $ / shares $ 128.69
Weighted-Average Grant Date Fair Value per Share, Granted | $ / shares 185.32
Weighted-Average Grant Date Fair Value per Share, Vested | $ / shares 125.75
Weighted-Average Grant Date Fair Value per Share, Forfeited/canceled | $ / shares 155.40
Weighted-Average Grant Date Fair Value per Share, Outstanding at December 31, 2019 | $ / shares $ 152.98