Incentive Plan (Summary Of Long-Term Incentive Units) (Details) (Long-Term Incentive Units [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Long-Term Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Shares, beginning of period, Shares	440,951
Unvested Shares, Granted, Shares	181,801
Unvested Shares, Vested, Shares	(289,564)
Unvested Shares, Cancelled or expired, Shares	(18,773)
Unvested Shares, end of period, Shares	314,415
Unvested Shares, beginning of period, Weighted-Average Grant Date Fair Value	$ 62.42
Unvested Shares, Granted, Weighted-Average Grant Date Fair Value	$ 52.15
Unvested Shares, Vested, Weighted-Average Grant Date Fair Value	$ 59.13
Unvested Shares, Cancelled or expired, Weighted-Average Grant Date Fair Value	$ 65.21
Unvested Shares, end of period, Weighted-Average Grant Date Fair Value	$ 59.34