Equity-Based Compensation Plans And Employee Benefit Plans (Summary Of Service-Based And Performance-Based Awards) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at December 31, 2010, Number of Phantom Units	62,927,000
Granted, Number of Phantom Units	47,680,000
Forfeited, Number of Phantom Units	(845,000)
Unvested at December 31, 2011, Number of Phantom Units	109,762,000	62,927,000
Unvested at December 31, 2010, Average Grant Date Fair Value	$ 20.64
Granted, Average Grant Date Fair Value	$ 27.03
Forfeited, Average Grant Date Fair Value	$ 28.19
Unvested at December 31, 2011, Average Grant Date Fair Value	$ 23.36	$ 20.64
Unvested at December 31, 2010, Total Value	$ 2,564	$ 1,299
Granted, Total Value	1,289
Forfeited, Total Value	(24)
Unvested at December 31, 2011, Total Value	2,564	1,299
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Phantom Units	104,236,000
Forfeited, Number of Phantom Units	(1,266,000)
Unvested at December 31, 2011, Number of Phantom Units	102,970,000
Granted, Average Grant Date Fair Value	$ 28.19
Forfeited, Average Grant Date Fair Value	$ 28.19
Unvested at December 31, 2011, Average Grant Date Fair Value	$ 28.19
Unvested at December 31, 2010, Total Value	2,902
Granted, Total Value	2,938
Forfeited, Total Value	(36)
Unvested at December 31, 2011, Total Value	$ 2,902