Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified				9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Natural Gas contract 2 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Purity Ethane contract 1 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Purity Ethane contract 2 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Purity Ethane contract 3 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Purity Ethane contract 4 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Propane contract 1 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Propane contract 2 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Propane contract 3 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Propane contract 4 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Normal Butane contract 1 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Normal Butane contract 2 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Normal Butane contract 3 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Normal Butane contract 4 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Isobutane contract 1 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Isobutane contract 2 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Isobutane contract 3 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Isobutane contract 4 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Natural Gasoline contract 1 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Natural Gasoline contract 3 [Member]	Sep. 30, 2012 NGL's [Member] Open Swap Contract [Member] Natural Gasoline contract 4 [Member]
Open Swap Contracts For Natural Gas Liquid
Calculation Period For Natural Gas Liquid				10/01/2012 - 12/31/2012	10/01/2012 - 12/31/2012	10/01/2012 - 12/31/2012	01/01/2013 - 12/31/2013	01/01/2013 - 12/31/2013	10/01/2012 - 12/31/2012	10/01/2012 - 12/31/2012	01/01/2013 - 12/31/2013	01/01/2013 - 12/31/2013	10/01/2012 - 12/31/2012	10/01/2012 - 12/31/2012	10/01/2013 - 12/31/2013	01/01/2013 – 12/31/2013	10/01/2012 - 12/31/2012	10/01/2012 - 12/31/2012	01/01/2013 - 12/31/2013	01/01/2013 - 12/31/2013	10/01/2012 - 12/31/2012	01/01/2013 - 12/31/2013	01/01/2013 - 12/31/2013
Fair Value of Asset (Liability)	$ 8,133	$ 9,282	$ 45	$ 3			$ (41)	$ (15)	$ 1	$ 5	$ 7	$ 38		$ 3	$ (3)	$ 16	$ (2)	$ (1)	$ (7)	$ 3	$ 2	$ 17	$ 19
Notional Quantity				6,000	55,700	55,700	110,000	110,000	27,000	27,000	53,000	53,000	7,500	7,500	14,700	14,700	4,000	4,000	7,000	7,000	6,000	12,000	12,000
Fixed Price				2.150	0.333	0.337	0.335	0.355	0.945	0.992	0.953	1.001	1.465	1.580	1.455	1.560	1.535	1.675	1.515	1.625	2.095	2.085	2.102