Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	4 Months Ended	9 Months Ended	4 Months Ended
	Sep. 30, 2010 Successor [Member]	Sep. 30, 2011 Successor [Member]	May 25, 2010 Predecessor [Member]
OPERATING ACTIVITIES:
Net income (loss)	$ 2,951	$ 59,991	$ (4,946)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Depreciation and amortization, including debt issuance cost, amortization and bond premium amortization	44,767	127,079	49,363
Write-off of debt issuance costs	0	0	1,780
Amortization of excess fair value of unconsoildated affilaites	0	4,385	0
Equity in earnings of unconsolidated affiliates	(29,875)	(91,306)	(15,872)
Derivative valuation changes	14,837	(21,660)	12,004
Loss on asset sales, net	190	50	303
Unit-based compensation expenses	440	2,444	12,070
Cash flow changes in current assets and liabilities:
Trade accounts receivable, accrued revenues and related party receivables	13,307	(13,298)	(11,272)
Other current assets	903	186	2,516
Trade accounts payable, accrued cost of gas and liquids, related party payables and deferred revenues	(30,026)	20,467	8,649
Other current liabilities	(8,186)	24,833	22,614
Distributions received from unconsolidated affiliates	29,875	91,306	12,446
Cash flow changes in other assets and liabilities	(701)	(61)	(234)
Net cash flows provided by operating activities	38,482	204,416	89,421
INVESTING ACTIVITIES:
Capital expenditures	(88,202)	(290,889)	(63,787)
Capital contributions to unconsolidated affiliates	(38,922)	(23,646)	(20,210)
Distribution in excess of earnings of unconsolidated affiliates	50,262	40,354	0
Acquisitions of investments in unconsolidated affiliates, net of cash received	12,848	(593,843)	(75,114)
Acquisition of Zephyr, net of $1,983 cash received	(191,313)	0	0
Proceeds from asset sales	70,302	10,232	10,661
Net cash flows used in investing activities	(185,025)	(857,792)	(148,450)
FINANCING ACTIVITIES:
Net borrowings (repayments) under revolving credit facility	(243,651)	160,000	199,008
Proceeds from issuance of senior notes	0	500,000	0
Debt issuance costs	(148)	(9,955)	(15,728)
Drafts payable	8,848	0	0
Partner contributions	19,724	0	0
Partner distributions	(55,251)	(199,640)	(86,078)
Disposition of assets between entities under common control in excess of historical cost	0	66	(16,973)
Distributions to noncontrolling interest	0	0	(1,135)
Proceeds from issuance of common units under LTIP, net of tax withholding	145	655	(4,874)
Proceeds from common unit issuances, net of issuance costs	399,872	203,917	(89)
Distributions to Series A Preferred Units	(1,945)	(5,836)	(1,945)
Net cash flows provided by financing activities	127,594	649,207	72,186
Net change in cash and cash equivalents	(18,949)	(4,169)	13,157
Cash and cash equivalents at beginning of period	22,984	9,400	9,827
Cash and cash equivalents at end of period	4,035	5,231	22,984
Supplemental cash flow information:
Non-cash capital expenditures	28,821	25,504	18,051
Issuance of common units for an acquisition	584,436	0	0
Deemed contribution from acquisition of assets between entities under common control	17,152	177	0
Release of escrow payable from restricted cash	1,011	0	500
Interest paid, net of amounts capitalized	32,425	47,303	5,410
Income taxes paid	$ 634	$ 0	$ 378