2.2.0.25falsefalse0209 - Disclosure - Commitments and Contingenciestruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $FROM_Jan01_2011_TO_Mar31_2011http://www.sec.gov/CIK0001297067duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170EPUDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0UnitsStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0cpno_CommitmentsAndContingenciesAbstractcpnofalsenadurationCommitments and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments and Contingencies.falsefalseCommitments and Contingencies [Abstract]3false0us-gaap_CommitmentsAndContingenciesDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00Note 9 — Commitments and Contingencies Commitments For the three months ended March 31, 2011 and 2010, rental expense for leased office space, vehicles, compressors and related field equipment used in our operations totaled $924,000 and $878,000, respectively.  We are party to firm transportation agreements with Wyoming Interstate Gas Company (“WIC”), under which we are obligated to pay for transportation capacity whether or not we use such capacity. Under these agreements, we are obligated to pay approximately $7,407,000 for the remainder of 2011, $9,867,000 in 2012, $8,978,000 in 2013, $5,509,000 in 2014, $4,093,000 in 2015 and $15,111,000 over the remainder of the contract term. The agreements expire on December 31, 2019. All of our obligations under these agreements are offset by capacity release agreements under which third party replacement shippers pay for the right to use our capacity. These capacity release agreements cover 100% of our total WIC capacity and continue through December 31, 2019. We have placed in escrow $1.9 million, classified as escrow cash on the consolidated balance sheets, as credit support for our obligations under the WIC agreements. Additionally, we have two firm gathering agreements with Fort Union, under which we are obligated to pay for gathering capacity on the Fort Union system whether or not we use such capacity. Under these agreements, we are obligated to pay approximately $4,599,000 for the remainder of 2011, $7,154,000 for 2012, $7,665,000 for 2013, $7,665,000 for 2014, $7,665,000 for 2015 and $14,700,000 over the remainder of the contract term. These commitments expire on November 30, 2017. We have fixed-quantity contractual commitments to Targa North Texas LP (“Targa”) in settlement of a dispute regarding what portion, if any, of natural gas we purchase from producers had been contractually dedicated for resale to Targa. As of March 31, 2011, we had fixed contractual commitments to provide Targa a total of 2.373 billion cubic feet of natural gas for each of 2011, 2012 and 2013. Under the terms of the agreement, we are obligated to pay annual fees ($1.10 per thousand cubic feet (“Mcf”), $1.15 per Mcf and $1.25 per Mcf for 2011, 2012 and 2013, respectively) to the extent our natural gas deliveries to Targa fall below the committed quantity. In February 2011, we paid $2,134,000 to Targa in settlement of our 2010 obligation. As of March 31, 2011, we have accrued $420,000 of our 2011 obligation. We have committed to deliver minimum quantities of mixed NGLs under a fractionation and product sales agreement with Formosa Hydrocarbons Company, Inc. (“Formosa”). Under this agreement, we have no payment obligations for the remainder of 2011 or for 2012, and we will be obligated to pay $8,085,000 for 2013, $10,731,000 for 2014, $10,731,000 for 2015 and $77,822,000 over the remainder of the contract term, to the extent our mixed NGL deliveries fall below the committed quantity. This commitment expires on November 30, 2025. Regulatory Compliance In the ordinary course of business, we are subject to various laws and regulations. In the opinion of our management, compliance with existing laws and regulations will not materially affect our financial position, results of operations or cash flows. Litigation As a result of our Rocky Mountains segment in October 2007, we acquired Cantera Gas Company LLC (“Cantera Gas Company,” formerly CMS Field Services, Inc. (“CMSFS”)). Cantera Gas Company is a party to a number of legal proceedings alleging (i) false reporting of natural gas prices by CMSFS and numerous other parties and (ii) other related claims. The claims made in these proceedings are based on events that occurred before Cantera Resources, Inc. acquired CMSFS in June 2003 (the “CMS Acquisition”). The amount of liability, if any, against Cantera Gas Company is not reasonably estimable. Pursuant to the CMS Acquisition purchase agreement, CMS Gas Transmission has assumed responsibility for the defense of these claims, and Cantera Gas Company is fully indemnified by CMS Gas Transmission and its parent, CMS Enterprises Company, against any losses that Cantera Gas Company may suffer as a result of these claims. We may, from time to time, be involved in other litigation and claims arising out of our operations in the normal course of business.Note 9 — Commitments and Contingencies Commitments For the three months ended March 31, 2011 and 2010, rental expense for leasedfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIncludes disclosure of commitments and contingencies. 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