CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH PROVIDED BY OPERATIONS:
Net earnings (loss)	$ (1,275)	$ 6,523	$ 21,610
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	23,717	24,615	22,275
Property sales (gains) oil and gas	0	(2,528)	0
Property sale (gains) other	(535)	(1,028)	(683)
Dry hole costs incurred	817	1,034	233
Impairment of oil and natural gas properties	12,082	8,009	2,630
Provision for doubtful accounts	27	(73)	46
Deferred income taxes	(4,843)	(6,151)	3,161
Net change in fair value contracts	188	402	(389)
Decrease (increase) in accounts receivable	72,594	99,749	(4,770)
Decrease (increase) in inventories	5,810	14,135	606
Decrease (increase) in income tax receivable	(1,617)	1,127	(898)
Decrease (increase) in prepayments	8,351	5,839	(8,687)
Increase (decrease) in accounts payable	(87,404)	(104,887)	7,809
Increase (decrease) in accrued and other liabilities	(166)	448	(516)
Other changes, net	(2,269)	(81)	1,549
Net cash provided by operating activities	25,477	47,133	43,976
INVESTING ACTIVITIES:
Property and equipment additions	(11,074)	(30,523)	(27,602)
Insurance and state collateral (deposits) refunds	283	(493)	(1,179)
Proceeds from property sales	719	7,045	1,082
Net cash (used in) investing activities	(10,072)	(23,971)	(27,699)
FINANCING ACTIVITIES:
Dividend payments	(3,712)	(3,711)	(2,783)
Net cash (used in) financing activities	(3,712)	(3,711)	(2,783)
Increase (decrease) in cash and cash equivalents	11,693	19,451	13,494
Cash and cash equivalents at beginning of year	80,184	60,733	47,239
Cash and cash equivalents at end of year	$ 91,877	$ 80,184	$ 60,733