Related Party Transactions (Schedule Of Cash Contributions From The Predecessor) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012
Related Party Transactions [Abstract]
Cash receipts	$ (204,898)	$ (109,274)
Production expenses paid	80,889	41,528
Derivative buyup payment	42,653
Interest paid	9,981	4,050
Capital expenditures paid	45,868	28,723
Contributions from (distributions to) the Predecessor	$ (25,507)	$ (34,973)