Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (162)	$ 23,046
Adjustments to reconcile net income (loss) to net cash from operating activities:
Accretion of asset retirement obligations	428	383
Depreciation and amortization	15,601	14,291
Amortization of debt issuance costs	43	43
Stock-based compensation	3,119	3,058
Other income - PPP Loan	(8,444)
Deferred income taxes	(37)	4,561
Changes in operating assets and liabilities:
Accounts receivable	(2,030)	(19,325)
Prepaid expenses and other current assets	630	625
Inventories	(8,027)	1,541
Other assets and liabilities	(1,154)	429
Accounts payable	3,409	(5,291)
Accrued expenses	(2,429)	3,062
Net cash from operating activities	947	26,423
Cash flow from investing activities:
Purchases of property, plant and equipment	(20,515)	(34,043)
Cash flows from financing activities
Proceeds from PPP Loan	8,444
Proceeds from borrowings	45,543	58,050
Repayment of borrowings	(32,597)	(50,801)
Repayments of financed insurance payable	(656)	(287)
Restricted stock surrendered for withholding taxes payable	(193)
Net cash from financing activities	20,541	6,962
Net change in cash and cash equivalents and restricted cash	973	(658)
Cash and cash equivalents and restricted cash, beginning of period	6,865	7,380
Cash and cash equivalents and restricted cash, end of period	7,838	6,722
Supplemental cash flow information:
Cash paid for interest	820	821
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued expenses	633	4,068
Additional asset retirement obligations incurred	$ 172	$ 239