CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH PROVIDED BY OPERATIONS:
Net earnings	$ 27,791	$ 22,931	$ 8,631
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	20,714	16,260	11,817
Property sale (gains) losses	(6,298)	(4,394)	94
Dry hole costs incurred	43	1,212	1,894
Impairment of oil and natural gas properties	5,555	14,749	2,224
Provision for doubtful accounts	(51)	1,141	29
Deferred income taxes	5,378	7,308	3,699
Net change in fair value contracts	1,377	(97)	(1,036)
Decrease (increase) in accounts receivable	(4,820)	(45,487)	(34,257)
Decrease (increase) in inventories	(9,579)	(5,598)	669
Decrease (increase) in income tax receivable	(719)	1,836	(145)
Decrease (increase) in prepayments	2,559	(2,547)	2,700
Increase (decrease) in accounts payable	10,474	47,662	40,521
Increase (decrease) in accrued and other liabilities	1,227	1,378	(406)
Other changes, net	843	(539)	494
Net cash provided by operating activities	54,494	55,815	36,928
INVESTING ACTIVITIES:
Property and equipment additions	(51,012)	(53,276)	(22,421)
Insurance and state collateral (deposits) refunds	(582)	(495)	(151)
Proceeds from property sales	6,342	8,394	147
Proceeds from the sale of discontinued operations	3,546	0	0
Redemption of short-term investments	0	11,098	0
Investment in short-term investments	0	(11,098)	0
Net cash (used in) investing activities	(41,706)	(45,377)	(22,425)
FINANCING ACTIVITIES:
Dividend payments	(2,615)	(2,404)	(2,277)
Net cash (used in) financing activities	(2,615)	(2,404)	(2,277)
Increase (decrease) in cash and cash equivalents	10,173	8,034	12,226
Cash and cash equivalents at beginning of year	37,066	29,032	16,806
Cash and cash equivalents at end of year	$ 47,239	$ 37,066	$ 29,032