Related Party Transactions (Schedule Of Reimbursement Of Administrative And Technical Services) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011
TGGT [Member]
Gathering, treating, and well connect fees	$ 54.1	[1]	$ 41.9	[1]
Natural gas purchases	5.1		10.0
General and administrative services	6.0		3.4
Purchase of gathering and other assets	0		3.4
Other	0.7		0.1
Total	11.8		16.9
Amounts due to EXCO	3.7				8.2
Amounts due from EXCO	20.1	[2]			39.4	[2]
OPCO [Member]
Advances to operator	4.9		20.4
General and administrative services	12.7		11.8
Total	12.7		11.8
Amounts due to EXCO	7.9				8.2
Amounts due from EXCO	$ 3.8	[2]			$ 0	[2]

[1] Represents the gross billings from TGGT.

[2] Due to the relationship of OPCO being the operator of our wells, we advance funds on an as needed basis, which we include in other current assets on our Condensed Consolidated Balance Sheets. Any amounts we owe are netted against the advance until the advances are utilized. If the advances are fully utilized, we record amounts owed in Accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets.