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				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Net income (loss)	$ 99,125		$ 28,988		$ 91,890		$ (17,561)
Net income (loss) attributable to predecessor operations			(13,057)				4,144
Distribution on Class C convertible preferred units	(3,500)				(7,000)
Amortization of preferred unit discount	(3,713)				(7,389)
Net income (loss) available to other unitholders	91,912		15,931		77,501		(13,417)
Less: general partner's interest in net income (loss)	(703)		16		2,455		(13)
Limited partners' interest in net income (loss)	92,615		15,915		75,046		(13,404)
Common unitholders' interest in net income (loss)	77,478		12,744		62,454		(10,694)
Subordinated unitholders' interest in net income (loss)	$ 15,137		$ 3,171		$ 12,592		$ (2,710)
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				16,666,667
Limited Partners-Affiliated - Common [Member]
Unitholders' (basic) (in dollars per unit)	$ 2.15		$ 0.44		$ 1.92		$ (0.38)
Unitholders' (diluted) (in dollars per unit)	$ 1.67		$ 0.44		$ 1.60		$ (0.38)
Common units (basic) (in units)	36,114,000	[1]	28,723,000	[1]	32,486,000	[1]	28,518,000	[1]
Common units (diluted) (in units)	52,780,000	[1]	28,723,000	[1]	49,153,000	[1]	28,518,000	[1]
Limited Partners-Affiliated - Subordinated [Member]
Unitholders' (basic) (in dollars per unit)	$ 2.12		$ 0.44		$ 1.76		$ (0.38)
Unitholders' (diluted) (in dollars per unit)	$ 1.65		$ 0.44		$ 1.50		$ (0.38)

[1] For the three and six months ended June 30, 2012, we had weighted average preferred units outstanding of 16,666,667, which are contingently convertible. These units have a dilutive effect on earnings per unit and have been included in the earnings per share calculation for the three and six months ended June 30, 2012.