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
	Mar. 31, 2013		Mar. 31, 2012
Schedule Of Earnings Per Partner Unit [Line Items]
Net income (loss)	$ (8,174)		$ (8,226)
Net income (loss) attributable to predecessor operations			991
Distribution on Class C convertible preferred units	(3,500)		(3,500)
Amortization of preferred unit discount	(3,829)		(3,676)
Distribution on Class B units	(2,990)
Net income (loss) available to other unitholders	(18,493)		(14,411)
General partner's interest in net income (loss)	734		3,137
Limited partners' interest in net income (loss)	(19,227)		(17,548)
Common unitholders' interest in net income (loss)	(19,227)		(14,039)
Subordinated unitholders' interest in net income (loss)			$ (3,509)
Weighted average preferred units outstanding	16,666,667
Weighted average Class B units outstanding	1,860,742
Limited Partners - Public And Affiliated Common Units [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Unitholders' (basic and diluted) (in dollars per unit)	(0.33)		(0.49)
Unitholders' (basic and diluted) (in units)	58,445,000	[1]	28,591,000	[1]
Limited Partners-Affiliated - Subordinated [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Unitholders' (basic and diluted) (in dollars per unit)			(0.49)
Unitholders' (basic and diluted) (in units)			7,146,000	[1]

[1] For the three months ended March 31, 2013 and 2012, we had weighted average preferred units outstanding of 16,666,667. For the three months ended March 31, 2013 we had 1,860,742 Class B units outstanding. For the three months ended March 31, 2012 we had no Class B units outstanding. The preferred and Class B units are contingently convertible into common units and could potentially dilute earnings per unit in the future and have not been included in the earnings per unit calculation for the three months ended March 31, 2013 and 2012, as they were anti-dilutive for the periods.