Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income	$ (59,854)	$ 7,621
Deferred income taxes	(21,822)	(2,287)
Equity (income) loss	527	187
DD&A	48,572	44,167
Asset impairment	77,882
Loss (gain) on sale of assets	(90)	561
Unrealized (gain) loss on marketable securities	(593)	226
Gain on sale of royalty interests in oil properties	(2,949)
Change in fair value of interest rate swaps	2,186	2,182
Amortization and write off of deferred financing costs	2,095	2,024
Accretion of ARO	1,272	1,167
Stock-based compensation	1,833	3,170
Allowance for parts and supplies inventory obsolescence		800
Change in current assets and liabilities:
Accounts receivable	(7,312)	(1,666)
Inventory	(8,603)	(7,703)
Parts and supplies	(2,130)	(402)
Prepaid income taxes	1,044	293
Prepaid expenses	2,577	(4,853)
Accounts payable and accrued liabilities	3,608	5,701
Other		382
Cash provided by operating activities	38,243	51,570
Investing activities:
Capital expenditures	(35,533)	(35,091)
Proceeds from sale of royalty interests in oil properties	2,949
Proceeds from sale of equipment	134	77
Proceeds from sale of marketable securities	2,007
Proceeds from maturities of certificates of deposit	245	1,007
Proceeds from sale of business		8,000
Cash used in investing activities	(30,198)	(26,007)
Financing activities:
Payments of bank debt	(42,063)	(38,793)
Borrowings of bank debt	33,750	19,000
Deferred financing costs	(1,192)	(730)
Proceeds from noncontrolling interests (Note 13)		4,000
Taxes paid on vesting of RSUs	(358)	(298)
Dividends	(4,965)	(4,942)
Cash used in financing activities	(14,828)	(21,763)
Increase (decrease) in cash ,cash equivalents, and restricted cash	(6,783)	3,800
Cash, cash equivalents, and restricted cash beginning of year	20,094	16,294
Cash, cash equivalents, and restricted cash end of year	13,311	20,094
Cash, cash equivalents, and restricted cash:
Cash, cash equivalents, and restricted cash, Total	13,311	20,094
Supplemental cash flow information:
Cash paid for interest	11,639	11,433
Cash received for income taxes, net	1,569	2,081
Capital expenditures included in accounts payable and prepaid expense	5,849	$ (4,837)
Right-to-use asset due to adoption of ASU 2016-02	$ 800