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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	(15) Subsequent Events On October 27, 2011, the Company paid the third of three installments payable related to its February 2008 acquisition of leasehold interests in the Piceance Basin from EnCana Oil & Gas (USA) Inc. The $100.0 million payment was funded with restricted cash on hand and the related letter of credit was released in conjunction with the final payment. On October 31, 2011, Delta sold its stock in DHS to DHS’s lender, LCPI, for $500,000. Delta expects to recognize a gain of approximately $6.1 million in connection with the divestiture of DHS during the three months ended December 31, 2011.