Properties and Equipment Acreage exchange (Details)	Sep. 30, 2016 a
PDC acres transferred to Noble [Member]
Gas and Oil Acreage [Line Items]
Gas and Oil Area, Developed, Gross	11,700
Noble acres transferred to PDC [Member]
Gas and Oil Acreage [Line Items]
Gas and Oil Area, Developed, Gross	13,500
Oil and Gas Properties [Member]
Gas and Oil Acreage [Line Items]
Gas and Oil Area, Developed, Gross	57,000