CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH PROVIDED BY OPERATIONS:
Net earnings	$ 21,610	$ 27,791	$ 22,931
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	22,275	20,714	16,260
Property sale (gains)	(683)	(6,298)	(4,394)
Dry hole costs incurred	233	43	1,212
Impairment of oil and natural gas properties	2,630	5,555	14,749
Provision for doubtful accounts	46	(51)	1,141
Deferred income taxes	3,161	5,378	7,308
Net change in fair value contracts	(389)	1,377	(97)
Decrease (increase) in accounts receivable	(4,770)	(4,820)	(45,487)
Decrease (increase) in inventories	606	(9,579)	(5,598)
Decrease (increase) in income tax receivable	(898)	(719)	1,836
Decrease (increase) in prepayments	(8,687)	2,559	(2,547)
Increase (decrease) in accounts payable	7,809	10,474	47,662
Increase (decrease) in accrued and other liabilities	(516)	1,227	1,378
Other changes, net	1,549	843	(539)
Net cash provided by operating activities	43,976	54,494	55,815
INVESTING ACTIVITIES:
Property and equipment additions	(27,602)	(51,012)	(53,276)
Insurance and state collateral (deposits) refunds	(1,179)	(582)	(495)
Proceeds from property sales	1,082	6,342	8,394
Proceeds from the sale of discontinued operations	0	3,546	0
Redemption of short-term investments	0	0	11,098
Investment in short-term investments	0	0	(11,098)
Net cash (used in) investing activities	(27,699)	(41,706)	(45,377)
FINANCING ACTIVITIES:
Dividend payments	(2,783)	(2,615)	(2,404)
Net cash (used in) financing activities	(2,783)	(2,615)	(2,404)
Increase (decrease) in cash and cash equivalents	13,494	10,173	8,034
Cash and cash equivalents at beginning of year	47,239	37,066	29,032
Cash and cash equivalents at end of year	$ 60,733	$ 47,239	$ 37,066