Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Feb. 25, 2014 MMBTU	Dec. 31, 2013 MMBTU
Nymex Henry Hub [Member] | January To March 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume	100,000	50,000
Average Price	4.39	4.38
Fair Value		$ 458
Nymex Henry Hub [Member] | Summer 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume		480,000
Average Price		3.9
Fair Value		(24,383)
Nymex Henry Hub [Member] | December 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume		50,000
Average Price		4.39
Fair Value		121
Nymex Henry Hub [Member] | November To December 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume	60,164
Average Price	4.34
Nymex WTI [Member] | Calendar 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume		2,458
Average Price		93.23
Fair Value		$ (2,072)
Swap | Nymex WTI [Member] | February To December 2014 [Member]
Schedule Of Derivative Instruments [Line Items]
Volume	1,000
Average Price	90.03