Stock-Based Compensation (Additional Information Regarding Options Outstanding And Exercisable) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	4,447
Options Exercisable, Number of Shares | shares	1,633
$0.00 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit	$ 0.00
Exercise price range, upper limit	$ 40.00
Options Outstanding, Number of Shares | shares	92
Options Outstanding, Weighted Average Remaining Contractual Life	7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 35.06
Options Exercisable, Number of Shares | shares	92
Options Exercisable, Weighted Average Exercise Price	$ 35.06
$40.01 - $70.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit	40.01
Exercise price range, upper limit	$ 70.00
Options Outstanding, Number of Shares | shares	435
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 10 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 46.11
Options Exercisable, Number of Shares | shares	435
Options Exercisable, Weighted Average Exercise Price	$ 46.11
$70.01 - $100.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit	70.01
Exercise price range, upper limit	$ 100.00
Options Outstanding, Number of Shares | shares	2,897
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 91.00
Options Exercisable, Number of Shares | shares	851
Options Exercisable, Weighted Average Exercise Price	$ 84.18
$100.01 - $130.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit	100.01
Exercise price range, upper limit	$ 130.00
Options Outstanding, Number of Shares | shares	1,023
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 124.20
Options Exercisable, Number of Shares | shares	255
Options Exercisable, Weighted Average Exercise Price	$ 124.19