Long-Term Equity Compensation (Summary of Stock Options) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Oustanding beginning balance, Number of Options	1,952,211
Granted, Number of Options	0	0	0
Exercised, Number of Options	(517,351)
Forfeited or expired, Number of Options	(2,675)
Oustanding ending balance, Number of Options	1,432,185	1,952,211
Outstanding beginning balance, Weighted Average Exercise Price	$ 33.01
Granted, Weighted Average Exercise Price	0.00
Exercised, Weighted Average Exercise Price	36.18
Forfeited or expired, Weighted Average Exercise Price	54.85
Outstanding ending balance, Weighted Average Exercise Price	$ 31.82	$ 33.01
Outstanding balance, Weighted Average Remaining Contractual Term (Years)	1 year 2 months 9 days
Oustanding balance, Agregate Intrinsic Value	$ 52,474,895
Vested or expected to vest, Number of Options	1,432,185
Vested or expected to vest, Weighted Average Exercise Price	$ 31.82
Vested or expected to vest, Weighted Average Remaining Contractual Term (Years)	1 year 2 months 9 days
Vested or expected to vest, Aggregate Intrinsic Value	$ 52,474,895
Exercisable, Number of Options	1,432,185
Exercisable, Weighted Average Exercise Price	$ 31.82
Exercisable, Weighted Average Remaining Contractual Term (Years)	1 year 2 months 9 days
Exercisable, Aggregate Intrinsic Value	$ 52,474,895