CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH PROVIDED BY OPERATIONS:
Net earnings	$ 22,931	$ 8,631	$ 4,149
Adjustments to reconcile net earnings to net cash from operating activities-
Depreciation, depletion and amortization	16,260	11,817	10,320
Property sale (gains) losses	(4,394)	94	(177)
Dry hole costs incurred	1,212	1,894	661
Impairment of oil and natural gas properties	14,749	2,224	3,773
Provision for doubtful accounts	1,141	29	430
Deferred income taxes	7,308	3,699	1,072
Net change in fair value contracts	(97)	(1,036)	251
Decrease (increase) in accounts receivable	(45,487)	(34,257)	(36,515)
Decrease (increase) in inventories	(5,598)	669	(1,053)
Decrease (increase) in income tax receivable	1,836	(145)	1,458
Decrease (increase) in prepayments	(2,547)	2,700	(5,580)
Increase (decrease) in accounts payable	47,662	40,521	43,069
Increase (decrease) in accrued and other liabilities	1,378	(406)	(58)
Other changes, net	(539)	494	485
Net cash provided by operating activities	55,815	36,928	22,285
INVESTING ACTIVITIES:
Property and equipment additions	(53,276)	(22,421)	(22,390)
Insurance and state collateral (deposits) refunds	(495)	(151)	(192)
Proceeds from property sales	8,394	147	1,004
Redemption of short-term investments	11,098	0	0
Investment in short-term investments	(11,098)	0	0
Net cash (used in) investing activities	(45,377)	(22,425)	(21,578)
FINANCING ACTIVITIES:
Dividend payments	(2,404)	(2,277)	(2,109)
Net cash (used in) financing activities	(2,404)	(2,277)	(2,109)
Increase (decrease) in cash and cash equivalents	8,034	12,226	(1,402)
Cash and cash equivalents at beginning of year	29,032	16,806	18,208
Cash and cash equivalents at end of year	$ 37,066	$ 29,032	$ 16,806