CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 9,070	$ 8,454
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion of discount on available-for-sale debt securities	(29)	(27)
Amortization of deferred offering costs	102	103
Depreciation, depletion and amortization	21,337	12,978
Change in fair value of derivative financial instruments	(1,642)	(3,362)
Gain on sale of US treasury bonds - available for sale	(4)
Stock option expense	848	720
Deferred tax expense	(11)	(7)
Change in assets and liabilities:
(Increase) decrease in accounts receivable-trade	726	(1,049)
Decrease in other assets	(43)	(408)
Increase in accounts payable and accruals	2,713	2,740
Decrease in other long-term liabilities	(858)	(186)
Net cash provided by operating activities	32,209	19,956
Cash flows from investing activities:
Purchase, exploration and development of oil and gas properties	(43,920)	(15,548)
Purchase of property and equipment	(731)	(5,183)
Proceeds from US treasury bonds - available for sale	13
Net cash used in investing activities	(44,638)	(20,731)
Cash flows from financing activities:
Proceeds from line of credit	10,000
Payments on debt and debentures	(91)	(1,469)
Issuance of common stock, net	37	83
Net cash provided by (used in) financing activities	9,946	(1,386)
Net decrease in cash and cash equivalents	(2,483)	(2,161)
Cash and cash equivalents at beginning of period	10,614	11,092
Cash and cash equivalents at end of period	8,131	8,931
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized	1,632	1,248
Noncash investing and financing activities
Accrued preferred stock dividend	$ 5	$ 5