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Additional Balance Sheet Information (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Receivable:    
Joint interest billing $ 2,189 $ 2,347
Trade receivables 1,580 1,558
Oil and gas sales 9,362 9,876
Other 436 3,146
Accounts Receivable, Gross 13,567 16,927
Less: Allowance for doubtful accounts (355) (421)
Total 13,212 16,506
Accounts Payable:    
Trade 3,968 5,853
Royalty and other owners 9,652 13,645
Prepaid drilling deposits 306 779
Other 5,642 9,261
Total 19,568 29,538
Accrued Liabilities:    
Compensation and related expenses 2,517 2,137
Property costs 4,549 5,117
Income tax   362
Other 552 1,347
Total $ 7,618 $ 8,963