Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (11,360)	$ (38,392)
Adjustments to reconcile net loss to net cash provided by operations:
Inventory impairments	0	8,996
Depreciation and amortization	21,493	22,915
Stock-based compensation expense	3,273	3,077
Provision for deferred income taxes	402	(11,418)
Credit loss expense	230	726
Gain on sale of assets	(5,358)	(2,163)
(Gain) loss on extinguishment of debt	790	(419)
Amortization of original issue discount and debt issuance costs	2,068	2,801
Change in assets and liabilities:
(Increase) decrease in receivables	(5,594)	66,510
(Increase) decrease in inventories	(209)	7,512
Increase in other assets	(2,236)	(5,294)
Increase (decrease) in accounts payable	21,344	(26,577)
Increase (decrease) in accrued liabilities and other	994	(3,261)
Net cash provided by operating activities	25,837	25,013
Cash flows from investing activities:
Capital expenditures	(10,477)	(10,655)
Proceeds from sale of property, plant and equipment	9,208	7,963
Net cash used in investing activities	(1,269)	(2,692)
Cash flows from financing activities:
Borrowings on lines of credit	97,746	117,068
Payments on lines of credit	(100,469)	(116,207)
Purchases of Convertible Notes	(18,107)	(29,124)
Proceeds from term loan	8,258	0
Debt issuance costs	(196)	0
Purchases of treasury stock	(1,350)	(326)
Other financing activities	808	2,480
Net cash used in financing activities	(13,310)	(26,109)
Effect of exchange rate changes on cash	(591)	(2,713)
Net increase (decrease) in cash, cash equivalents, and restricted cash	10,667	(6,501)
Cash, cash equivalents, and restricted cash at beginning of period	30,348	56,863
Cash, cash equivalents, and restricted cash at end of period	$ 41,015	$ 50,362