UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH PROVIDED BY OPERATIONS:
Net earnings	$ 8,015	$ 6,575
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	5,529	4,163
Property sale (gains)	(35)	(2,901)
Dry hole costs incurred	0	11
Impairment of oil and gas properties	52	265
Provision for doubtful accounts	0	(49)
Deferred income taxes	864	(27)
Net change in fair value contracts	(254)	2,882
Decrease (increase) in accounts receivable	(15,041)	(18,930)
Decrease (increase) in inventories	(2,310)	(10,507)
Decrease (increase) in income tax receivable	1,199	417
Decrease (increase) in prepayments	1,050	3,218
Increase (decrease) in accounts payable	(13,991)	19,102
Increase (decrease) in accrued liabilities	4,026	4,931
Other changes, net	28	61
Net cash provided by (used in) operating activities	(10,868)	9,211
INVESTING ACTIVITIES:
Property and equipment additions	(3,903)	(15,222)
Insurance and state collateral (deposits) refunds	0	42
Proceeds from property sales	35	1,346
Proceeds from the sale of discontinued operations	0	3,546
Net cash (used in) investing activities	(3,868)	(10,288)
Increase (decrease) in cash and cash equivalents	(14,736)	(1,077)
Cash and cash equivalents at beginning of period	47,239	37,066
Cash and cash equivalents at end of period	$ 32,503	$ 35,989