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	0 Months Ended		12 Months Ended
	Dec. 31, 2010		Dec. 31, 2012		Dec. 31, 2011
Schedule Of Earnings Per Partner Unit [Line Items]
Net income (loss)	$ (12,037)		$ 79,751		$ 88,295
Net income (loss) attributable to predecessor operations	4,938		(37,350)		(76,249)
Distribution on Class C convertible preferred units			(14,000)		(3,424)
Amortization of preferred unit discount			(14,930)		(3,638)
Net income (loss) available to other unitholders	(7,099)		13,471		4,984
Less: general partner's interest in net income (loss)	(7)		6,149		1,575
Limited partners' interest in net income (loss)	(7,092)		7,322		3,409
Common unitholders' interest in net income (loss)	(5,577)		6,570		2,730
Subordinated unitholders' interest in net income (loss)	(1,515)		753		679
Unitholders' (basic) (in dollars per unit)	(0.21)		0.19		0.10
Unitholders' (diluted) (in dollars per unit)	(0.21)		0.19		0.10
Subordinated units (basic and diluted) (in dollars per unit)	(0.21)		0.11		0.10
Common units (basic) (in units)	26,298,000		35,132,000		28,728,000
Common units (diluted) (in units)	26,298,000		35,282,000		28,728,000
Subordinated units (basic and diluted) (in units)	7,146,000		6,970,000		7,146,000
Limited Partners-Affiliated - Common [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Net income (loss)	(2,396)		(6,333)		1,079
Unitholders' (basic) (in dollars per unit)	(0.21)		0.19		0.10
Unitholders' (diluted) (in dollars per unit)	(0.21)		0.19		0.10
Common units (basic) (in units)	26,298,000	[1],[2]	35,132,000	[1],[2]	28,728,000	[1],[2]
Common units (diluted) (in units)	26,298,000	[1],[2]	35,282,000	[1],[2]	28,728,000	[1],[2]
Limited Partners-Affiliated - Subordinated [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Net income (loss)	$ (1,515)		$ 2,369		$ 682
Subordinated units (basic and diluted) (in dollars per unit)	(0.21)		0.11		0.10
Subordinated units (basic and diluted) (in units)	7,146,000	[1],[2]	6,970,000	[1],[2]	7,146,000	[1],[2]
Class B Units [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Common units (diluted) (in units)			150,896
Class C Convertible Preferred [Member]
Schedule Of Earnings Per Partner Unit [Line Items]
Weighted average preferred units outstanding			16,666,667		4,109,589

[1] In 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 2012 earnings per unit calculation as they were antidilutive for the period. In 2011, we had weighted average preferred units outstanding of 4,109,589, which are contingently convertible. These units could potentially dilute earnings per unit in the future and have not been included in the 2011 earnings per unit calculation as they were antidilutive for the period

[2] In connection with the expiration of the subordination period on December 22, 2012, the General Partner has the right to convert all or a portion of the fourth quarter management incentive fee into Class B common units. In 2012, we had weighted average Class B units of 150,896 which were contingently convertible. The Class B units were included in the 2012 diluted earnings per unit calculation as they were dilutive to the period