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Construction Contracts
 6 Months Ended
Jun. 30, 2013
Contractors [Abstract]  
Construction Contracts
Construction Contracts

Century Plant. As of December 31, 2012, the Company had substantially completed construction of a carbon dioxide (“CO2”) treatment plant in Pecos County, Texas (the “Century Plant”), and associated compression and pipeline facilities pursuant to an agreement with Occidental Petroleum Corporation (“Occidental”). The Company constructed the Century Plant for a contract price of $796.3 million, which included agreed upon change orders and scope revisions, that Occidental paid to the Company through periodic cost reimbursements based upon the percentage of the project completed. Upon substantial completion of construction in late 2012, Occidental took ownership and began operating the Century Plant for the purpose of separating and removing CO2 from the delivered natural gas stream. The Company recorded additions totaling $180.0 million to its oil and natural gas properties for costs incurred in excess of contract amounts during the construction period. Costs in excess of billings and contract loss of $2.8 million at June 30, 2013, representing costs incurred in the final stages of construction, are reported as a current asset in the accompanying unaudited condensed consolidated balance sheets. Billings and contract loss in excess of costs incurred of $15.5 million at December 31, 2012 are reported as a current liability in the accompanying unaudited condensed consolidated balance sheets.

Pursuant to a 30-year treating agreement executed simultaneously with the construction agreement, Occidental will remove CO2 from the Company’s delivered natural gas production volumes. Under this agreement, the Company is required to deliver certain minimum CO2 volumes annually and is required to compensate Occidental to the extent such requirements are not met. See Note 11 for additional discussion of this contract. The Company retains all methane gas from the natural gas it delivers to the Century Plant.

    
Transmission Expansion Projects. As of June 30, 2013, the Company had substantially completed the construction of a series of electrical transmission expansion and upgrade projects in northern Oklahoma. The Company constructed these projects for a contract price of $23.3 million, which included agreed upon change orders. With substantial completion of the contract in the second quarter of 2013, the Company recognized construction contract revenue and costs equal to the revised contract price of $23.3 million, which are included in the accompanying unaudited condensed consolidated statements of operations. Costs in excess of billings on these projects of approximately $2.3 million, representing costs incurred in the final stages of construction, and $11.2 million at June 30, 2013 and December 31, 2012, respectively, are included in current assets in the accompanying unaudited condensed consolidated balance sheets.