Condensed Consolidated Statements Of Operations (Parenthetical) (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Gas sales, related party amounts	$ 4,507	$ 3,840	$ 13,788	$ 15,479
NGL sales, related party amounts	(773)	103,892	22,195	253,933
Gathering, transportation and other fees, related party amounts	9,024	6,141	23,024	17,611
Other, related party amounts	1	2,665	1,479	7,455
Costs of sales, related party amounts	4,391	5,049	12,965	16,070
General and administrative, related party amounts	$ 4,300	$ 4,225	$ 12,900	$ 12,354