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Additional Balance Sheet Information (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts Receivable:    
Joint interest billing $ 5,845 $ 2,347
Trade receivables 1,771 1,558
Oil and gas sales 10,535 9,876
Other 393 3,146
Accounts Receivable, Gross 18,544 16,927
Less: Allowance for doubtful accounts (386) (421)
Total 18,158 16,506
Accounts Payable:    
Trade 4,940 5,853
Royalty and other owners 11,168 13,645
Prepaid drilling deposits 698 779
Other 8,801 9,261
Total 25,607 29,538
Accrued Liabilities:    
Compensation and related expenses 4,451 2,137
Property costs 3,003 5,117
Income tax   362
Other 810 1,347
Total $ 8,264 $ 8,963