Long-Term Equity Compensation (Summary of Options Outstanding and Exercisable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
$11.19 - 20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 11.19
Range of Exercise Prices, maximum	$ 20.00
Options Outstanding, Number of Options	171,466
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 10 months 2 days
Options Outstanding, Weighted Average Exercise Price	$ 15.03
Options Exercisable, Number of Options	167,716
Options Exercisable, Weighted Average Exercise Price	$ 15.01
$20.01 - 25.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 20.01
Range of Exercise Prices, maximum	$ 25.00
Options Outstanding, Number of Options	1,795,752
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 23.43
Options Exercisable, Number of Options	893,916
Options Exercisable, Weighted Average Exercise Price	$ 23.81
$25.01 - 30.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 25.01
Range of Exercise Prices, maximum	$ 30.00
Options Outstanding, Number of Options	599,947
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 6 months 10 days
Options Outstanding, Weighted Average Exercise Price	$ 28.70
Options Exercisable, Number of Options	583,335
Options Exercisable, Weighted Average Exercise Price	$ 28.75
$30.01 - 40.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 30.01
Range of Exercise Prices, maximum	$ 40.00
Options Outstanding, Number of Options	924,225
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price	$ 31.77
Options Exercisable, Number of Options	519,737
Options Exercisable, Weighted Average Exercise Price	$ 32.53
$40.01 - 50.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 40.01
Range of Exercise Prices, maximum	$ 50.00
Options Outstanding, Number of Options	630,630
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 4 months 13 days
Options Outstanding, Weighted Average Exercise Price	$ 46.62
Options Exercisable, Number of Options	630,630
Options Exercisable, Weighted Average Exercise Price	$ 46.62
$50.01 - 58.07 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 50.01
Range of Exercise Prices, maximum	$ 58.07
Options Outstanding, Number of Options	159,713
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 3 months 3 days
Options Outstanding, Weighted Average Exercise Price	$ 54.00
Options Exercisable, Number of Options	159,713
Options Exercisable, Weighted Average Exercise Price	$ 54.00
$11.19 - 58.07 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, minimum	$ 11.19
Range of Exercise Prices, maximum	$ 58.07
Options Outstanding, Number of Options	4,281,733
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price	$ 30.19
Options Exercisable, Number of Options	2,955,047
Options Exercisable, Weighted Average Exercise Price	$ 32.32