Derivative Financial Instruments Derivative Financial Instruments (Schedule of NGL Derivative Contracts Volume and Weighted Average Prices) (Details)	Sep. 30, 2014 NGL contract, in BBLS [Member] Collar Contracts With Short Puts for Current Year [Member]		Sep. 30, 2014 NGL contract, in BBLS [Member] Collar Contracts With Short Puts for Year 2 [Member]		Sep. 30, 2014 NGL contract, in BBLS [Member] Collar Contracts With Short Puts for Year 3 [Member]		Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Current Year [Member]	Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Current Year [Member] Short Put [Member]	Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Year 2 [Member]	Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Year 2 [Member] Short Put [Member]	Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Year 3 [Member]	Sep. 30, 2014 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Year 3 [Member] Short Put [Member]	Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Collar Contracts for Current Year [Member]		Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Collar Contracts for Year 2 [Member]		Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Collar Contracts for Year 3 [Member]		Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Swap Contracts for Current Year [Member]		Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Swap Contracts for Year 2 [Member]		Sep. 30, 2014 Ethane [Member] NGL contract, in BBLS [Member] Swap Contracts for Year 3 [Member]		Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Collar Contracts for Current Year [Member]	Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Collar Contracts for Year 2 [Member]	Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Collar Contracts for Year 3 [Member]	Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Current Year [Member]	Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Year 2 [Member]	Sep. 30, 2014 Ethane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Year 3 [Member]	Oct. 30, 2014 Ethane [Member] Subsequent Event [Member] NGL contract, in BBLS [Member] Swap Contracts for Year 3 [Member]		Oct. 30, 2014 Ethane [Member] Subsequent Event [Member] NGL contracts, price per BBL [Member] Swap Contracts for Year 3 [Member]	Sep. 30, 2014 Propane [Member] NGL contract, in BBLS [Member] Swap Contracts for Current Year [Member]		Sep. 30, 2014 Propane [Member] NGL contract, in BBLS [Member] Swap Contracts for Year 2 [Member]		Sep. 30, 2014 Propane [Member] NGL contract, in BBLS [Member] Swap Contracts for Year 3 [Member]		Sep. 30, 2014 Propane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Current Year [Member]	Sep. 30, 2014 Propane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Year 2 [Member]	Sep. 30, 2014 Propane [Member] NGL contracts, price per BBL [Member] Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,500	[1]	0	[1]	0	[1]							3,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	3,000	[1],[2]							1,000	[1],[2]		1,674	[1]	0	[1]	0	[1],[2]
Derivative, Average Cap Price							97.93		0.00		0.00														13.72	0.00	0.00
Derivative, Average Floor Price							90.14		0.00		0.00														10.78	0.00	0.00
Derivative, Notional Amount, Price Per Unit								81.36		0.00		0.00
Derivative, Swap Type, Average Fixed Price																												0.00	0.00	12.39			11.97							47.95	0.00	0.00

[1] (a)Represent derivative contracts that reduce the price volatility of natural gasoline, ethane or propane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

[2] (b) During the period from October 1, 2014 through October 30, 2014, the Company entered into an additional 1,000 BBL per day of 2016 swap contracts for ethane with a fixed price of $11.97 per BBL.