Stock-Based Compensation (Information Regarding Stock Options Outstanding) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
$5.91 - $28.40
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	$ 28.4
Options Outstanding, Options	1,022
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 6 months 9 days
Options Outstanding, Weighted Average Exercise Price	$ 24.51
Options Exercisable, Options	998
Options Exercisable, Weighted Average Exercise Price	$ 24.54
$30.02 - $40.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 30.02
Range of Exercise Prices, Upper Limit	$ 40.89
Options Outstanding, Options	1,029
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 9 months 22 days
Options Outstanding, Weighted Average Exercise Price	$ 39.60
Options Exercisable, Options	1,029
Options Exercisable, Weighted Average Exercise Price	$ 39.60
$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	1,703
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price	$ 53.92
Options Exercisable, Options	1,460
Options Exercisable, Weighted Average Exercise Price	$ 53.15
$60.49 - $88.35
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 60.49
Range of Exercise Prices, Upper Limit	$ 88.35
Options Outstanding, Options	1,178
Options Outstanding, Weighted Average Remaining Contractual Life (years)	7 years 9 months 22 days
Options Outstanding, Weighted Average Exercise Price	$ 70.37
Options Exercisable, Options	471
Options Exercisable, Weighted Average Exercise Price	$ 68.34