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Additional Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable:
Joint interest billing	$ 2,516	$ 2,189
Trade receivables	1,764	1,580
Oil and gas sales	9,528	9,362
Other	97	436
Accounts Receivable, Gross	13,905	13,567
Less: Allowance for doubtful accounts	(339)	(355)
Total	13,566	13,212
Accounts Payable:
Trade	2,636	3,968
Royalty and other owners	12,139	9,652
Prepaid drilling deposits	343	306
Other	6,545	5,642
Total	21,663	19,568
Accrued Liabilities:
Compensation and related expenses	2,918	2,517
Property costs	1,927	4,549
Other	384	552
Total	$ 5,229	$ 7,618

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