UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net (losses) earnings	$ (1,142)	$ 4,834
Adjustments to reconcile net (losses) earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	7,532	9,871
Gains on sale of property	(129)	(1,275)
Impairment of oil and natural gas properties	3	87
Provision for doubtful accounts	(8)	93
Deferred income taxes	(926)	(1,965)
Net change in fair value contracts	(700)	(124)
Losses from equity investment	0	400
Loss on deconsolidation of subsidiary (Note 3)	1,635	0
Changes in assets and liabilities:
Accounts receivable	13,581	(10,073)
Accounts receivable/payable, affiliates	(151)	0
Inventories	(2,887)	(5,191)
Income tax receivable	(336)	2,587
Prepayments and other current assets	887	(1,683)
Accounts payable	3,357	7,043
Accrued liabilities	(483)	1,570
Other	(461)	(22)
Net cash provided by operating activities	19,772	6,152
Investing activities:
Property and equipment additions	(2,108)	(4,812)
Proceeds from property sales	190	2,860
Investments in unconsolidated affiliates	0	(4,700)
Insurance and state collateral (deposits) refunds	347	1,250
Net cash used in investing activities	(1,571)	(5,402)
Financing activities:
Dividends paid on common stock	(1,856)	(1,856)
Net cash used in financing activities	(1,856)	(1,856)
Increase (decrease) in cash and cash equivalents	16,345	(1,106)
Cash and cash equivalents at beginning of period	87,342	91,877
Cash and cash equivalents at end of period	$ 103,687	$ 90,771