Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (38,392)	$ 5,588
Adjustments to reconcile net income (loss) to net cash provided by operations:
Inventory impairments	8,996	0
Depreciation and amortization	22,915	23,070
Stock-based compensation expense	3,077	6,874
Provision for deferred income taxes	(11,418)	(1,514)
Credit loss expense	726	789
Gain on sale of assets	(2,163)	(5,128)
Gain on extinguishment of debt	(419)	0
Amortization of original issue discount and debt issuance costs	2,801	2,973
Change in assets and liabilities:
Decrease in receivables	66,510	6,583
Decrease in inventories	7,512	3,868
Increase in other assets	(5,294)	(5,058)
Increase (decrease) in accounts payable	(26,577)	6,207
Decrease in accrued liabilities and other	(3,261)	(10,012)
Net cash provided by operating activities	25,013	34,240
Cash flows from investing activities:
Capital expenditures	(10,655)	(23,866)
Proceeds from sale of property, plant and equipment	7,963	5,708
Net cash used in investing activities	(2,692)	(18,158)
Cash flows from financing activities:
Borrowings on lines of credit	117,068	135,952
Payments on lines of credit	(116,207)	(141,317)
Purchases of Convertible Notes	(29,124)	0
Debt issuance costs	0	(917)
Proceeds from employee stock plans	0	1,090
Purchases of treasury stock	(326)	(17,365)
Other financing activities	2,480	2,758
Net cash used in financing activities	(26,109)	(19,799)
Effect of exchange rate changes on cash	(2,713)	(125)
Net decrease in cash, cash equivalents, and restricted cash	(6,501)	(3,842)
Cash, cash equivalents, and restricted cash at beginning of period	56,863	64,266
Cash, cash equivalents, and restricted cash at end of period	$ 50,362	$ 60,424