Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 5,231	$ 9,400
Trade accounts receivable, net of allowance of $546 and $297	37,444	35,212
Accrued revenues	86,682	74,017
Related party receivables	34,750	32,342
Derivative assets	4,504	2,650
Other current assets	25,222	7,384
Total current assets	193,833	161,005
Property, Plant and Equipment:
Gathering and transmission systems	610,562	543,286
Compression equipment	839,606	812,428
Gas plants and buildings	189,251	185,741
Other property, plant and equipment	115,411	81,295
Construction-in-progress	227,527	97,439
Total property, plant and equipment	1,982,357	1,720,189
Less accumulated depreciation	(157,767)	(59,971)
Property, plant and equipment, net	1,824,590	1,660,218
Other Assets:
Investment in unconsolidated affiliates	1,924,183	1,351,256
Long-term derivative assets	3,696	23
Other, net of accumulated amortization of debt issuance costs of $8,393 and $3,326	41,447	37,758
Total other assets	1,969,326	1,389,037
Intangible Assets and Goodwill:
Intangible assets, net of accumulated amortization of $37,538 and $15,584	748,201	770,155
Goodwill	789,789	789,789
Total intangible assets and goodwill	1,537,990	1,559,944
TOTAL ASSETS	5,525,739	4,770,204
Current Liabilities:
Trade accounts payable	64,955	50,208
Accrued cost of gas and liquids	92,468	80,756
Related party payables	11,633	3,338
Deferred revenues, including related party amounts of $41 and $8,765	16,838	25,257
Derivative liabilities	12,435	13,172
Other current liabilities	48,252	23,419
Total current liabilities	246,581	196,150
Long-term derivative liabilities	36,633	61,127
Other long-term liabilities	6,167	6,521
Long-term debt, net	1,800,380	1,141,061
Commitments and contingencies
Series A Preferred Units, redemption amount of $84,659 and $83,891	71,091	70,943
Partners' capital and noncontrolling interest:
Common units	3,003,341	2,940,732
General partner interest	330,783	333,077
Accumulated other comprehensive loss	(2,002)	(11,099)
Total partners' capital	3,332,122	3,262,710
Noncontrolling interest	32,765	31,692
Total partners' capital and noncontrolling interest	3,364,887	3,294,402
TOTAL LIABILITIES AND PARTNERS' CAPITAL AND NONCONTROLLING INTEREST	$ 5,525,739	$ 4,770,204