Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets (Liabilities)
Lease and well equipment inventory	$ 1,212	$ 785
Fair value on a non-recurring basis [Member]
Assets (Liabilities)
Asset retirement obligations	(3,985)	(1,470)
Total	(3,985)	(1,470)
Fair value on a non-recurring basis [Member] | Level 1 [Member]
Assets (Liabilities)
Asset retirement obligations	0	0
Total	0	0
Fair value on a non-recurring basis [Member] | Level 2 [Member]
Assets (Liabilities)
Asset retirement obligations	0	0
Total	0	0
Fair value on a non-recurring basis [Member] | Level 3 [Member]
Assets (Liabilities)
Asset retirement obligations	(3,985)	(1,470)
Total	$ (3,985)	$ (1,470)