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)	$ (1,343)	$ 13,254
Adjustments to reconcile net (loss) income to cash provided by (used in) operating activities:
Deferred income taxes	(54)	(401)
Depreciation	5,320	5,540
Amortization	2,909	3,391
Asset impairments	3,847	0
Equity in income of nonconsolidated investments	0	(21)
Loss (gain) on sales and disposals of property, plant, and equipment	236	(7)
Stock-based compensation	1,238	2,034
Change in operating assets and liabilities:
Accounts receivable	(4,493)	(12,402)
Inventories	3,400	(9,842)
Other current assets	(2,486)	(612)
Prepaid income tax	(958)	(3,077)
Other noncurrent assets	(4,421)	(490)
Accounts payable	8,061	895
Deferred revenue	151	1,940
Accrued payroll and employee benefits	(4,182)	(2,487)
Accrued settlement	(2,000)	(4,000)
Other current liabilities	(3,069)	(1,933)
Other long-term liabilities	3,992	(1,211)
Net cash provided by (used in) operating activities	6,148	(9,429)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	11	76
Capital expenditures on property, plant, and equipment	(7,433)	(3,848)
Net cash used in investing activities	(7,422)	(3,772)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(86,359)	(97,269)
Proceeds from debt	83,748	113,402
Debt issuance costs	(418)	(836)
Treasury stock acquisitions	(1,660)	(591)
Net cash (used in) provided by financing activities	(4,689)	14,706
Effect of exchange rate changes on cash and cash equivalents	(828)	214
Net (decrease) increase in cash and cash equivalents	(6,791)	1,719
Cash and cash equivalents at beginning of period	14,178	10,282
Cash and cash equivalents at end of period	7,387	12,001
Supplemental disclosure of cash flow information:
Interest paid	1,504	2,492
Income taxes paid	$ 1,327	$ 5,395