Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	$ 46,992
NGL | Open Swap Contract
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	1,398
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	04/01/2015 - 12/31/2015
Notional Quantity	150,000
Fixed Price	1.000
Fair Value of Asset (Liability)	626
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	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Fixed Price	1.03
Fair Value of Asset (Liability)	444
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	04/01/2015 - 12/31/2015
Notional Quantity	68,000
Fixed Price	1.073
Fair Value of Asset (Liability)	$ 328