Long-Term Equity Compensation (Summary of Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Oustanding beginning balance, Number of Options	4,281,733
Granted, Number of Options	0	0	661,950
Exercised, Number of Options	(818,527)
Forfeited or expired, Number of Options	(149,850)
Oustanding ending balance, Number of Options	3,313,356	4,281,733
Outstanding beginning balance, Weighted Average Exercise Price	$ 30.19
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 24.52
Forfeited or expired, Weighted Average Exercise Price	$ 35.93
Outstanding ending balance, Weighted Average Exercise Price	$ 31.33	$ 30.19
Outstanding balance, Weighted Average Remaining Contractual Term (Years)	2 years 7 months 28 days
Oustanding balance, Agregate Intrinsic Value	$ 9,891,298
Vested or expected to vest, Number of Options	3,292,080
Vested or expected to vest, Weighted Average Exercise Price	$ 31.34
Vested or expected to vest, Weighted Average Remaining Contractual Term (Years)	2 years 7 months 24 days
Vested or expected to vest, Aggregate Intrinsic Value	9,881,448
Exercisable, Number of Options	3,102,963
Exercisable, Weighted Average Exercise Price	$ 31.39
Exercisable, Weighted Average Remaining Contractual Term (Years)	2 years 6 months 22 days
Exercisable, Aggregate Intrinsic Value	$ 9,846,565