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Stock-Based Compensation (Information Regarding Stock Options Outstanding) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$11.99 - $48.97  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit $ 11.99
Range of Exercise Prices, Upper Limit $ 48.97
Options Outstanding, Options | shares 181
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 1 year 3 days
Options Outstanding, Weighted-Average Exercise Price $ 43.29
Options Exercisable, Options | shares 181
Options Exercisable, Weighted-Average Remaining Contractual Life (years) 1 year 3 days
Options Exercisable, Weighted-Average Exercise Price $ 43.29
Options Unvested, Options | shares 0
Options Unvested, Weighted-Average Remaining Contractual Life (years) 0 years
Options Unvested, Weighted-Average Exercise Price $ 0
$58.67  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 58.67
Range of Exercise Prices, Upper Limit $ 58.67
Options Outstanding, Options | shares 267
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 1 year 10 months 13 days
Options Outstanding, Weighted-Average Exercise Price $ 58.67
Options Exercisable, Options | shares 267
Options Exercisable, Weighted-Average Remaining Contractual Life (years) 1 year 10 months 13 days
Options Exercisable, Weighted-Average Exercise Price $ 58.67
Options Unvested, Options | shares 0
Options Unvested, Weighted-Average Remaining Contractual Life (years) 0 years
Options Unvested, Weighted-Average Exercise Price $ 0
$67.44  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 67.44
Range of Exercise Prices, Upper Limit $ 67.44
Options Outstanding, Options | shares 280
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 2 years 10 months 13 days
Options Outstanding, Weighted-Average Exercise Price $ 67.44
Options Exercisable, Options | shares 280
Options Exercisable, Weighted-Average Remaining Contractual Life (years) 2 years 10 months 13 days
Options Exercisable, Weighted-Average Exercise Price $ 67.44
Options Unvested, Options | shares 0
Options Unvested, Weighted-Average Remaining Contractual Life (years) 0 years
Options Unvested, Weighted-Average Exercise Price $ 0
$76.31 - $95.09  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 76.31
Range of Exercise Prices, Upper Limit $ 95.09
Options Outstanding, Options | shares 256
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 6 years 5 months 8 days
Options Outstanding, Weighted-Average Exercise Price $ 93.89
Options Exercisable, Options | shares 196
Options Exercisable, Weighted-Average Remaining Contractual Life (years) 6 years 4 months 9 days
Options Exercisable, Weighted-Average Exercise Price $ 93.62
Options Unvested, Options | shares 60
Options Unvested, Weighted-Average Remaining Contractual Life (years) 6 years 8 months 15 days
Options Unvested, Weighted-Average Exercise Price $ 94.77