Predecessor's Unconsolidated Investment In Ute Energy, LLC (Schedule Of Operations From Equity Method Investment) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 21, 2010 Predecessor [Member]	Dec. 21, 2010 Predecessor [Member] Ute Energy L L C [Member]
Revenue	$ 8,986	$ 371,998	$ 360,904	$ 253,386	$ 37,818
Operating expenses	(7,141)	(301,657)	(269,128)	(221,091)	(27,071)
Operating income (loss)	1,845	70,341	91,776	32,295	10,747
Interest expense, net	(1,266)	(43,133)	(50,491)	(22,179)	(2,192)
Other income (expense)				(482)	(7,163)
Net income (loss)	$ (12,037)	$ 79,751	$ 88,295	$ 31,913	$ 15,718