Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	$ (346)
NGL's [Member] | Open Swap Contract [Member]
Open swap contracts for natural gas liquid
Fair Value of Asset (Liability)	640
NGL's [Member] | Open Swap Contract [Member] | Purity Ethane contract 1 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	110,000
Fixed Price	0.335
Fair Value of Asset (Liability)	29
NGL's [Member] | Open Swap Contract [Member] | Purity Ethane contract 2 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	110,000
Fixed Price	0.355
Fair Value of Asset (Liability)	49
NGL's [Member] | Open Swap Contract [Member] | Propane contract 1 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	53,000
Fixed Price	0.953
Fair Value of Asset (Liability)	(5)
NGL's [Member] | Open Swap Contract [Member] | Propane contract 2 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	106,000
Fixed Price	0.960
Fair Value of Asset (Liability)	(5)
NGL's [Member] | Open Swap Contract [Member] | Propane contract 3 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	53,000
Fixed Price	1.001
Fair Value of Asset (Liability)	17
NGL's [Member] | Open Swap Contract [Member] | Propane contract 4 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	116,000
Fixed Price	0.950
Fair Value of Asset (Liability)	(4)
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 1 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	14,700
Fixed Price	1.455
Fair Value of Asset (Liability)	2
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 2 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	14,700
Fixed Price	1.560
Fair Value of Asset (Liability)	16
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 3 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	21,000
Fixed Price	1.575
Fair Value of Asset (Liability)	26
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 4 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	117,000
Fixed Price	1.575
Fair Value of Asset (Liability)	146
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 5 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	17,500
Fixed Price	1.540
Fair Value of Asset (Liability)	25
NGL's [Member] | Open Swap Contract [Member] | Normal Butane contract 6 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	45,500
Fixed Price	1.550
Fair Value of Asset (Liability)	70
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 1 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	7,000
Fixed Price	1.515
Fair Value of Asset (Liability)	1
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 2 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	7,000
Fixed Price	1.625
Fair Value of Asset (Liability)	8
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 3 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	43,500
Fixed Price	1.675
Fair Value of Asset (Liability)	71
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 4 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	23,000
Fixed Price	1.675
Fair Value of Asset (Liability)	35
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 5 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	22,000
Fixed Price	1.640
Fair Value of Asset (Liability)	35
NGL's [Member] | Open Swap Contract [Member] | Isobutane contract 6 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	37,000
Fixed Price	1.640
Fair Value of Asset (Liability)	62
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 1 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	12,000
Fixed Price	2.025
Fair Value of Asset (Liability)	(6)
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 2 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	12,000
Fixed Price	2.085
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 3 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	12,000
Fixed Price	2.102
Fair Value of Asset (Liability)	2
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 4 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	36,000
Fixed Price	2.105
Fair Value of Asset (Liability)	6
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 5 [Member]
Open swap contracts for natural gas liquid
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	90,500
Fixed Price	2.148
Fair Value of Asset (Liability)	45
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 6 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	30,000
Fixed Price	1.970
Fair Value of Asset (Liability)	1
NGL's [Member] | Open Swap Contract [Member] | Natural Gasoline contract 7 [Member]
Open swap contracts for natural gas liquid
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	41,000
Fixed Price	2.000
Fair Value of Asset (Liability)	$ 14