CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (13,279)	$ (19,452)
Adjustments to reconcile net loss to net cash provided (used) by operating activities:
Deferred income taxes	327	(374)
Depreciation and amortization of property, plant and equipment	16,762	17,592
Amortization of intangible and other assets	315	315
Other	(1,058)	1,373
Cash provided (used) by changes in assets and liabilities:
Accounts receivable	(17,321)	(7,512)
Inventories	625	(2,996)
Prepaid insurance	2,265	3,115
Accounts payable	8,598	(3,171)
Accrued interest	10,412	11,805
Other assets and other liabilities	5,065	(2,873)
Net cash provided (used) by operating activities	12,711	(2,178)
Cash flows from investing activities
Expenditures for property, plant and equipment	(6,133)	(10,737)
Other investing activities	198	179
Net cash used by investing activities	(5,935)	(10,558)
Cash flows from financing activities
Proceeds from revolving debt facility		30,000
Proceeds from other long-term debt		2,570
Payments on other long-term debt	(3,353)	(2,042)
Payments on short-term financing	(5,419)	(3,036)
Other financing activities	(36)	(64)
Net cash provided (used) by financing activities	(8,808)	27,428
Net increase (decrease) in cash and cash equivalents	(2,032)	14,692
Cash and cash equivalents at beginning of period	16,264	22,791
Cash and cash equivalents at end of period	$ 14,232	$ 37,483