Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commodity Derivatives [Abstract]
Realized (loss) gain on commodity derivatives - natural gas	$ (33,729)	$ (19,764)	$ (40,843)	$ (19,764)
Realized (loss) gain on commodity derivatives - crude oil	(3,562)	0	(5,402)	0
Unrealized Gain (Loss) on Derivatives	22,189	41,855	(14,130)	(2,860)
Gain loss on commodity derivatives	(15,102)	22,091	(60,375)	(22,624)
N W Rockies [Member] | July 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume per day	30,000		30,000
Fair Value	(107)		(107)
Average Basis Differential	(0.105)		(0.105)
Swap [Member] | Nymex WTI [Member] | Calendar 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume per day	4,000		4,000
Average Price	93.19		93.19
Fair Value	(7,343)		(7,343)
Swap [Member] | Nymex Henry Hub [Member] | Fall 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume per day	85,000		85,000
Average Price	4.35		4.35
Fair Value	(803)		(803)
Swap [Member] | Nymex Henry Hub [Member] | Summer 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume per day	480,000		480,000
Average Price	3.9		3.9
Fair Value	$ (31,754)		$ (31,754)