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Asset Retirement Obligations	3 Months Ended
Asset Retirement Obligations	Mar. 31, 2015
Asset Retirement Obligations
Asset Retirement Obligations	9. Asset Retirement Obligations Asset Retirement Obligations (“AROs”) represent the future abandonment costs of tangible assets, such as wells, service assets and other facilities. The fair value of the ARO at inception is capitalized as part of the carrying amount of the related long-lived assets. AROs approximated $22.0 million and $21.6 million as of March 31, 2015 and December 31, 2014, respectively, and the liability has been accreted to its present value as of March 31, 2015 and December 31, 2014.