UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
CASH PROVIDED BY OPERATIONS:
Net earnings	$ 9,172	$ 3,479
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	7,320	5,550
Property sale (gains)	(3,368)	(119)
Dry hole costs incurred	511	303
Impairment of oil and gas properties	562	789
Provision for doubtful accounts	287	2
Deferred income taxes	4,761	361
Net change in fair value contracts	(508)	158
Decrease (increase) in accounts receivable	(22,866)	11,171
Decrease (increase) in inventories	(5,802)	3,710
Decrease (increase) in income tax receivable	1,909	967
Decrease (increase) in prepayments	(376)	4,396
Increase (decrease) in accounts payable	36,681	(1,851)
Increase (decrease) in accrued liabilities	2,379	421
Other changes, net	91	32
Net cash provided by operating activities	30,571	29,369
INVESTING ACTIVITIES:
Property and equipment additions	(30,262)	(8,025)
Insurance and state collateral (deposits) refunds	0	(93)
Proceeds from property sales	7,296	123
Investment in marketable securities	(11,098)	0
Redemption of marketable securities	2,400	0
Net cash (used in) investing activities	(31,664)	(7,995)
Increase (decrease) in cash and cash equivalents	(1,093)	21,374
Cash and cash equivalents at beginning of period	29,032	16,806
Cash and cash equivalents at end of period	$ 27,939	$ 38,180

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).