CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows provided by operating activities:
Net income (loss)	$ 34,041	$ 30,473	$ (18,853)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	8,316	6,576	6,506
Amortization of purchased intangible assets	1,544	2,944	4,060
Amortization and write-off of deferred debt issuance costs	178	314	390
Stock-based compensation	5,204	3,580	2,975
Deferred income tax benefit	4,289	(3,653)	(556)
Loss on disposal of property, plant and equipment	530	78	125
Restructuring and asset impairment expenses	19,503	1,114	4,283
Goodwill impairment charge	0	0	17,584
Transition tax liability	0	(679)	946
Change in:
Accounts receivable, net	(1,221)	(11,409)	(14,425)
Inventories	(2,671)	(16,610)	(5,294)
Prepaid expenses and other	(5,724)	491	(440)
Accounts payable	10,145	2,197	5,216
Contract liabilities	1,603	(4,721)	3,207
Accrued anti-dumping duties and penalties	(8,000)	4,391	(2,941)
Accrued expenses and other liabilities	(3,143)	12,552	3,964
Net cash provided by operating activities	64,594	27,638	6,747
Cash flows used in investing activities:
Acquisition of property, plant and equipment	(27,210)	(45,095)	(6,186)
Proceeds on sale of property, plant and equipment	1,263	0	2
Net cash used in investing activities	(25,947)	(45,095)	(6,184)
Cash flows provided by (used in) financing activities:
(Payments) borrowings on revolving loans, net	(17,129)	(1,628)
(Payments) borrowings on revolving loans, net			2,000
(Payments) borrowings on capital expenditure facility	(10,125)
(Payments) borrowings on capital expenditure facility		25,000	0
Payment of dividends	(2,762)	(1,189)	(1,174)
Payment of deferred debt issuance costs	0	(314)	(138)
Net proceeds from issuance of common stock to employees and directors	557	442	296
Treasury stock purchases	(1,103)	(453)	(337)
Net cash provided by (used in) financing activities	(30,562)	21,858	647
Effects of exchange rates on cash	(1,107)	(9)	1,354
Net increase in cash and cash equivalents	6,978	4,392	2,564
Cash and cash equivalents, beginning of the period	13,375	8,983	6,419
Cash and cash equivalents, end of the period	20,353	13,375	8,983
Supplemental disclosure of cash flow information:
Non-cash lease liabilities arising from obtaining right-of-use assets	8,821
Cash paid during the period for -
Interest	1,445	1,383	1,150
Income taxes, net	$ 20,995	$ 1,284	$ 124