Supplemental Oil and Gas Information (Unaudited) Prices used for Standardized Measure (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Natural Gas [Member] | Henry Hub [Member]
Supplemental Oil and Gas Information [Line Items]
Representative prices	3.67	2.76	4.12
Natural Gas [Member] | AECO [Member]
Supplemental Oil and Gas Information [Line Items]
Representative prices	2.90	2.35	3.65
Oil [Member] | WTI Cushing [Member]
Supplemental Oil and Gas Information [Line Items]
Representative prices	97.18	94.71	95.71