CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS
Transactions with affiliates - Transportation, compression and processing fees	$ 17,874	$ 2,091	$ 11
Transactions with affiliates - Cost of natural gas and natural gas liquids	171,138	19,290	518
Transactions with affiliates - Transportation	$ 9,514	$ 6,846	$ 5,478