Accrued And Other Liabilities (Schedule Of Accrued And Other Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 MMcf		Dec. 31, 2011 MMcf
Accrued And Other Liabilities [Line Items]
Distributions payable	$ 3,500	[1]	$ 20,545	[1]
Accrued capital spending	6,109		9,590
Accrued lease operating expenses	11,173		8,412
Accrued production taxes	7,401		4,460
Senior notes accrued interest	11,563
Gas imbalance liability	5,351	[2]	4,010	[2]
Other	1,187		3,010
Accrued and other liabilities	46,284		50,027
Underproduced [Member]
Accrued And Other Liabilities [Line Items]
Gas imbalance liability	(1,200)		(1,100)
Gas imbalance, volume	1.5		1.6
Gross natural gas position per MCF	3.46		3.01
Overproduced [Member]
Accrued And Other Liabilities [Line Items]
Gas imbalance liability	(5,400)		(4,000)
Gas imbalance, volume	2.1		2.3
Gross natural gas position per MCF	3.41		2.96
Preferred [Member]
Accrued And Other Liabilities [Line Items]
Distributions payable	3,500		3,400
General And Limited Partners [Member]
Accrued And Other Liabilities [Line Items]
Distributions payable			$ 17,100

[1] For the year ended December 31, 2012, balance includes preferred distributions payable to affiliates of $3.5 million.

[2] For the year ended December 31, 2011, balance includes distributions payable to our general partner and limited partners of $17.1 million and preferred distributions payable of $3.4 million.