CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 21, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]
Cash flows from operating activities:
Net Income (loss)	$ (12,067)	$ 61,137	$ 31,913	$ (115,414)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	2,130	78,354	66,482	16,993
Accretion of asset retirement obligations	77	2,702	3,674	3,585
Amortization of deferred financing costs	45	1,520	2,681	627
Recognition of unit-based awards	20	1,351	3,470	0
(Gain) loss on disposal of furniture, fixtures and equipment	0	0	(482)	723
General and administrative expense contributed by the Fund	666	29,072	0	0
Impairment of oil and gas properties	0	0	0	28,338
Amortization of costs of derivative contracts	0	0	0	1,219
Unrealized (gains) losses on commodity derivative contracts (See Note X)	12,662	(95,564)	(5,598)	108,164
Unrealized (gains) losses on investment in marketable equity securities	0	0	0	(5,640)
Realized losses on investment in marketable equity securities	0	0	0	5,246
Deferred income tax expense	(71)	849	0	0
Bargain purchase gain	0	0	0	(1,200)
Equity in earnings of Ute Energy, LLC	0	0	(3,782)	(2,675)
Gain on equity share issuance	0	0	(4,064)	0
Accounts receivable and other assets	(4,278)	(29,029)	(39,727)	15,052
Accounts payable and other liabilities	2,580	9,682	41,378	9,889
Net cash provided by (used in) operating activities	1,764	60,074	95,945	64,907
Cash flows from investing activities:
Additions to oil and gas properties	(318)	(55,480)	(56,133)	(31,278)
Acquisition of oil and gas properties	(77,763)	0	(891,870)	(43,300)
Additions to furniture, equipment and other	0	0	(1,934)	(1,456)
Proceeds from sale of gas processing assets	0	0	890	0
Proceeds from sale of other assets	0	0	170	0
Increase in property reclamation deposit	0	0	0	(19)
Investment in Ute Energy, LLC	0	0	0	(1,925)
Proceeds from sales of marketable equity securities	0	0	0	6,233
Property acquisition deposit	0	0	(8,000)	0
Proceeds from sale of properties	0	1,327	0	16,287
Net cash used in investing activities	(78,081)	(54,153)	(956,877)	(55,458)
Cash flows from financing activities:
Proceeds from underwriters' exercise of overallotment option	0	41,963
Net proceeds from initial public offering (See Note 1)	279,750	0	0	0
Distributions to the Fund (See Note 1)	(300,000)	(42,000)	0	0
Contributions from the General Partner	0	715
Distributions to unitholders	0	(46,026)
Intercompany financing from the Fund (See Note 15)	387	0	0	0
Contributions by partners and non-controlling interest owners	0	0	474,864	15,991
Distributions to partners and non-controlling interest owners	0	0	(30,000)	(27,019)
Contributions from the Predecessor	53,034	8,986	0	0
Proceeds from bank borrowings (See Note 8)	248,000	275,000	584,383	33,000
Repayment of debt assumed from the Fund (See Note 8)	(200,000)	(227,000)	0	0
Repayments on bank borrowings	0	0	(113,752)	(35,300)
Deferred financing costs	(2,659)	(2,321)	(12,047)	0
Net cash provided by (used in) financing activities	78,512	9,317	903,448	(13,328)
Increase (decrease) in cash and cash equivalents	2,195	15,238	42,516	(3,879)
Cash and cash equivalents at beginning of period		2,195	17,156	21,035
Cash and cash equivalents at end of period	$ 2,195	$ 17,433	$ 59,672	$ 17,156