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Stock-Based Compensation (Information Regarding Stock Options Outstanding) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
$5.91 - $40.89  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit $ 5.91
Range of Exercise Prices, Upper Limit $ 40.89
Options Outstanding, Options | shares 874
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 2 years 4 months 5 days
Options Outstanding, Weighted-Average Exercise Price $ 34.25
Options Exercisable, Options | shares 868
Options Exercisable, Weighted-Average Exercise Price $ 34.39
$41.33 - $58.67  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 41.33
Range of Exercise Prices, Upper Limit $ 58.67
Options Outstanding, Options | shares 1,175
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 4 years 3 months 1 day
Options Outstanding, Weighted-Average Exercise Price $ 54.02
Options Exercisable, Options | shares 1,175
Options Exercisable, Weighted-Average Exercise Price $ 54.02
$61.68 - $69.70  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 61.68
Range of Exercise Prices, Upper Limit $ 69.7
Options Outstanding, Options | shares 641
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 5 years 8 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 67.38
Options Exercisable, Options | shares 641
Options Exercisable, Weighted-Average Exercise Price $ 67.38
$73.45 - $95.09  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 73.45
Range of Exercise Prices, Upper Limit $ 95.09
Options Outstanding, Options | shares 446
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 8 years 5 months 20 days
Options Outstanding, Weighted-Average Exercise Price $ 90.11
Options Exercisable, Options | shares 78
Options Exercisable, Weighted-Average Exercise Price $ 83.78