Commitments and Contingencies (Details 3) (USD $)	6 Months Ended	0 Months Ended	3 Months Ended	1 Months Ended		12 Months Ended
	Jun. 30, 2013	Dec. 11, 2012 Hitch Enterprises, Inc., et al. v. Cimarex Energy Co., et al.	Dec. 31, 2012 Hitch Enterprises, Inc., et al. v. Cimarex Energy Co., et al.	Aug. 31, 2011 H.B. Krug, et al versus H&P	Jan. 31, 2009 H.B. Krug, et al versus H&P	Dec. 31, 2008 H.B. Krug, et al versus H&P
Loss Contingencies
Preliminary resolution amount		$ 16,400,000
Accrued litigation expense			16,400,000			119,600,000
Award to plaintiff, damages and disgorgement					119,600,000
Initial award to plaintiff, disgorgement				112,700,000
Award to plaintiff, damages				6,845,000
Changes in accrued liabilities
Accrued liabilities related to lawsuit at beginning of period	155,374,000
Accrued post-judgment interest and costs	4,692,000
Accrued liabilities related to lawsuit at ending of period	$ 160,066,000