Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenue:
Natural gas sales	$ 120,815		$ 87,524		$ 348,538		$ 292,559
Natural gas liquids sales	191,370		118,999		521,129		353,119
Transportation, compression and processing fees	30,337		17,909		82,706		47,539
Condensate and other	11,169		13,272		37,299		41,204
Total revenue	353,691		237,704		989,672		734,421
Costs and expenses:
Cost of natural gas and natural gas liquids	281,858	[1]	174,461	[1]	779,986	[1]	551,939	[1]
Transportation	6,991	[1]	5,340	[1]	19,202	[1]	16,619	[1]
Operations and maintenance	16,091		13,004		46,953		38,337
Depreciation, amortization and impairment	21,911		15,218		56,143		46,002
General and administrative	10,031		9,869		34,530		31,311
Taxes other than income	1,502		1,315		4,029		3,658
Equity in loss (earnings) from unconsolidated affiliates	161,589		(2,049)		158,581		19,788
Total costs and expenses	499,973		217,158		1,099,424		707,654
Operating (loss) income	(146,282)		20,546		(109,752)		26,767
Other income (expense):
Interest and other income	16		15		31		59
Loss on refinancing of unsecured debt					(18,233)
Interest and other financing costs	(11,080)		(12,943)		(34,450)		(41,239)
(Loss) income before income taxes	(157,346)		7,618		(162,404)		(14,413)
Provision for income taxes	(390)		(320)		(1,161)		(660)
Net (loss) income	(157,736)		7,298		(163,565)		(15,073)
Preferred unit distributions	(8,279)		(7,500)		(24,235)		(7,500)
Net loss to common units	$ (166,015)		$ (202)		$ (187,800)		$ (22,573)
Basic and diluted net loss per common unit	$ (2.51)				$ (2.84)		$ (0.36)
Weighted average number of common units	66,246		65,658		66,125		63,193
Distributions declared per common unit	$ 0.575		$ 0.575		$ 1.725		$ 1.725

[1] Exclusive of operations and maintenance and depreciation, amortization and impairment shown separately below.