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Stock-Based Compensation (Information Regarding Stock Options Outstanding) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
$5.91 - $38.75  
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 $ 38.75
Options Outstanding, Options | shares 1,030
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 2 years 5 months 28 days
Options Outstanding, Weighted-Average Exercise Price $ 29.68
Options Exercisable, Options | shares 1,019
Options Exercisable, Weighted-Average Exercise Price $ 29.81
$38.86 - $48.97  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 38.86
Range of Exercise Prices, Upper Limit $ 48.97
Options Outstanding, Options | shares 1,077
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 4 years 3 months 8 days
Options Outstanding, Weighted-Average Exercise Price $ 45.39
Options Exercisable, Options | shares 1,077
Options Exercisable, Weighted-Average Exercise Price $ 45.39
$51.52 - $65.72  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 51.52
Range of Exercise Prices, Upper Limit $ 65.72
Options Outstanding, Options | shares 802
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 5 years 7 months 20 days
Options Outstanding, Weighted-Average Exercise Price $ 58.68
Options Exercisable, Options | shares 794
Options Exercisable, Weighted-Average Exercise Price $ 58.64
$67.34 - $94.15  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit 67.34
Range of Exercise Prices, Upper Limit $ 94.15
Options Outstanding, Options | shares 1,077
Options Outstanding, Weighted-Average Remaining Contractual Life (years) 7 years 28 days
Options Outstanding, Weighted-Average Exercise Price $ 71.55
Options Exercisable, Options | shares 649
Options Exercisable, Weighted-Average Exercise Price $ 69.43