Net Income/(Loss) Per Limited Partner Unit (Calculation Of Net Loss Per Limited Partner Unit) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Schedule Of Earnings Per Partner Unit [Line Items]
Net income (loss)	$ (45,007)		$ 105,165		$ 46,883		$ 87,604
Net income	(45,007)		105,165		46,883		87,604
Net income (loss) attributable to predecessor operations			(53,235)				(49,091)
Distribution on Class C convertible preferred units	(3,500)				(10,500)
Amortization of preferred unit discount	(3,751)				(11,140)
Net income (loss) available to other unitholders	(52,258)		51,930		25,243		38,513
Less: general partner's interest in net income (loss)	3,705		52		6,150		39
Limited partners' interest in net income (loss)	(55,963)		51,878		19,093		38,474
Common unitholders' interest in net income (loss)	(46,930)		41,540		16,717		30,829
Subordinated unitholders' interest in net income (loss)	$ (9,033)		$ 10,338		$ 2,376		$ 7,644
Subordinated units (basic and diluted) (in units)	7,146,000	[1]	7,146,000	[1]	7,146,000	[1]	7,146,000	[1]
Weighted average preferred units outstanding					16,666,667
Limited Partners-Affiliated - Common [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Unitholders' (basic) (in dollars per unit)	$ (1.25)		$ 1.45		$ 0.49		$ 1.07
Unitholders' (diluted) (in dollars per unit)	$ (1.25)		$ 1.45		$ 0.49		$ 1.07
Common units (basic) (in units)	37,425,000	[1]	28,713,000	[1]	34,347,000	[1]	28,698,000	[1]
Common units (diluted) (in units)	37,425,000	[1]	28,713,000	[1]	34,347,000	[1]	28,698,000	[1]
Limited Partners-Affiliated - Subordinated [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Unitholders' (basic) (in dollars per unit)	$ (1.26)		$ 1.45		$ 0.33		$ 1.07
Unitholders' (diluted) (in dollars per unit)	$ (1.26)		$ 1.45		$ 0.33		$ 1.07

[1] For the three and nine months ended September 30, 2012, we had weighted average preferred units outstanding of 16,666,667, which are contingently convertible. These units could potentially dilute earnings per unit in the future and have not been included in the earnings per unit calculation for the three and nine months ended September 30, 2012, as they were anti-dilutive for the periods.