CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010 Predecessor [Member]
Cash flows from operating activities:
Net income	$ 38,513	$ 50,981
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	25,043	45,149
Accretion of asset retirement obligations	865	2,648
Amortization of deferred financing costs	430	2,042
Recognition of unit-based awards	990	0
Loss on disposal of furniture, fixtures and equipment	0	575
General and administrative expense contributed by the Fund	9,544	0
Unrealized gains on derivative contracts (See Note 4)	(58,363)	(23,238)
Deferred income tax expense	361	0
Equity in earnings of Ute Energy, LLC	0	(1,490)
Gain on equity share issuance	0	(4,064)
Changes in operating assets and liabilities:
Accounts receivable and other assets	(16,415)	(32,698)
Accounts payable and other liabilities	2,520	10,857
Net cash provided by operating activities	3,488	50,762
Cash flows from investing activities:
Additions to oil and gas properties	(16,039)	(33,653)
Acquisition of oil and gas properties	0	(895,922)
Additions of furniture, equipment and other	0	(1,469)
Proceeds from the sale of oil and gas leases	1,327	0
Net cash used in investing activities	(14,712)	(931,044)
Cash flows from financing activities:
Proceeds from over-allotment (See Note 1)	41,963	0
Distribution to the Fund (See Note 1)	(42,000)	0
Contributions from general partner	715	453,054
Distributions to unitholders	(31,223)	(17,820)
Proceeds from bank borrowings	41,000	574,752
Repayments on bank borrowings	0	(113,534)
Deferred financing costs	(214)	(11,986)
Net cash provided by financing activities	10,241	884,466
(Decrease) increase in cash and cash equivalents	(983)	4,184
Cash and cash equivalents at beginning of period	2,195	17,156
Cash and cash equivalents at end of period	$ 1,212	$ 21,340