Transactions With Related Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Y Unit	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships	16
Number of oil and gas limited partnerships for third party investment	3
Number of oil and gas limited partnerships for employee investment	13
Minimum salary for employees to participate in the oil and gas partnership		$ 36,000	$ 36,000
Contract drilling	246,000	352,000	529,000
Well supervision and other fees	434,000	396,000	386,000
General and administrative expense reimbursement	39,000	610,000	536,000
Number of natural gas wells selling	23
Term of agreement period	5
Superior Pipeline Company, L.L.C. [Member]
Related Party Transaction [Line Items]
Proceeds from sales of volumes gathered and processed under the agreement percentage	10.00%
Minimum [Member]
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	1.00%
Maximum [Member]
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	15.00%
Sullivan And Company, L.L.C. [Member]
Related Party Transaction [Line Items]
Proceeds from sales of volumes gathered and processed under the agreement percentage	90.00%
Upland Resources [Member]
Related Party Transaction [Line Items]
Number of wells drilled	3.0
Revenue from Related Parties	1,600,000
Payments for Royalties	$ 1,200,000