Derivative Financial Instruments (Details 1) - Jun. 30, 2015 $ in Thousands	USD ($) gal / mo $ / Gallons
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	$ 23,460
NGL | Open Swap Contract
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	$ 1,027
NGL | Open Swap Contract | NGL Propane Swap Contract, 150,000 Notional Amount, 1.000 Fixed Price
Open swap contracts for natural gas liquid
Calculation Period	07/01/2015 - 12/31/2015
Notional Quantity | gal / mo	150,000
Fixed Price | $ / Gallons	1.000
Fair Value of Asset (Liability)	$ 462
NGL | Open Swap Contract | NGL Propane Swap Contract, 100,000 Notional Amount, 1.030 Fixed Price
Open swap contracts for natural gas liquid
Calculation Period	07/01/2015 - 12/31/2015
Notional Quantity | gal / mo	100,000
Fixed Price | $ / Gallons	1.03
Fair Value of Asset (Liability)	$ 326
NGL | Open Swap Contract | NGL Propane Swap Contract, 68,000 Notional Amount, 1.073 Fixed Price
Open swap contracts for natural gas liquid
Calculation Period	07/01/2015 - 12/31/2015
Notional Quantity | gal / mo	68,000
Fixed Price | $ / Gallons	1.073
Fair Value of Asset (Liability)	$ 239