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Stock-Based Compensation (Summary of Restricted Stock Unit Activity) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Stock-Based Compensation [Abstract]  
Number of Shares, Outstanding at December 31, | shares 328
Number of Shares, Granted | shares 138
Number of Shares, Vested | shares (129)
Number of Shares, Forfeited/canceled | shares (13)
Number of Shares, Outstanding at December 31, | shares 324
Weighted-Average Grant Date Fair Value per Share, Outstanding at December 31, | $ / shares $ 110.20
Weighted-Average Grant Date Fair Value per Share, Granted | $ / shares 156.61
Weighted-Average Grant Date Fair Value per Share, Vested | $ / shares 110.93
Weighted-Average Grant Date Fair Value per Share, Forfeited/canceled | $ / shares 135.22
Weighted-Average Grant Date Fair Value per Share, Outstanding at December 31, | $ / shares $ 128.69