Condensed Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gas sales, related party amounts	$ 3,801	$ 6,161	$ 9,281	$ 11,639
NGL sales, related party amounts	679	77,048	22,968	150,041
Gathering, transportation and other fees, related party amounts	7,349	5,254	14,000	11,470
Other revenues, related party amounts	0	2,924	1,478	4,790
Cost of sales, related party amounts	2,697	7,807	8,574	11,021
General and administrative, related party amounts	$ 4,300	$ 4,224	$ 8,600	$ 8,129