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Divestitures and Discontinued Operations Additional Information (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Oct. 15, 2014
PDCM Divestiture
Jul. 29, 2014
PDCM Divestiture
Dec. 31, 2013
Shallow Upper Devonian Sale
Dec. 31, 2013
Piceance and NECO Asset Group
Dec. 31, 2013
Shallow Upper Devonian Sale
PDCE proportionate share
Dec. 31, 2013
Shallow Upper Devonian Letter of Credit
Additional Disclosures            
Oil and gas assets sale price before adjustments   $ 250.0 $ 20.6   $ 5.1  
Divestiture Sale Price After Adjustment 190          
Cash received from PDCM divestiture ($ million) 150          
Promissory note from PDCM divestiture ($ million) 40          
Proceeds from Sale of Oil and Gas Property and Equipment       177.6    
Letters of Credit Novated           6.7
Ownership interest in PDCM   50.00%        
Proceeds To Non-Affiliated Investor Partners       $ 17.0