Derivative Financial Instruments Derivative Financial Instruments (Schedule of NGL Derivative Contracts Volume and Weighted Average Prices) (Details) - Derivative, Name [Domain]	Aug. 04, 2015 bbl / d $ / bbl	Jun. 30, 2015 bbl / d $ / bbl
Propane [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		11,000
Propane [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		4,500
Propane [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl		21.62
Propane [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl		22.12
Propane [Member] | Subsequent Event [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,000
Propane [Member] | Subsequent Event [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl	20.76
Ethane [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		6,000
Ethane [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		4,000
Ethane [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl		7.80
Ethane [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl		12.29
Ethane [Member] | Subsequent Event [Member] | NGL contract, in BBLS [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	1,000
Ethane [Member] | Subsequent Event [Member] | NGL contracts, price per BBL [Member] | Swap Contracts for Current Year [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / bbl	8.93