Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets (Liabilities)
Lease and well equipment inventory	$ 1,478	$ 1,343
Fair value on a non-recurring basis [Member]
Assets (Liabilities)
Lease and well equipment inventory		1,343
Total	(459)	1,156
Fair value on a non-recurring basis [Member] | Asset retirement obligations [Member]
Assets (Liabilities)
Asset retirement obligations	(459)	(187)
Fair value on a non-recurring basis [Member] | Level 1 [Member]
Assets (Liabilities)
Lease and well equipment inventory
Total
Fair value on a non-recurring basis [Member] | Level 1 [Member] | Asset retirement obligations [Member]
Assets (Liabilities)
Asset retirement obligations
Fair value on a non-recurring basis [Member] | Level 2 [Member]
Assets (Liabilities)
Lease and well equipment inventory
Total
Fair value on a non-recurring basis [Member] | Level 2 [Member] | Asset retirement obligations [Member]
Assets (Liabilities)
Asset retirement obligations
Fair value on a non-recurring basis [Member] | Level 3 [Member]
Assets (Liabilities)
Lease and well equipment inventory		1,343
Total	(459)	1,156
Fair value on a non-recurring basis [Member] | Level 3 [Member] | Asset retirement obligations [Member]
Assets (Liabilities)
Asset retirement obligations	$ (459)	$ (187)