CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ (98,238)	$ 407	$ 5,301
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	22,927	24,033	26,747
Provision for credit losses	70	(182)	0
Deferred income taxes	(1,149)	1,377	(1,560)
Shares issued for employee benefit plan	1,293	1,199	1,092
Employee and director stock-based compensation	8,809	10,013	9,969
Performance-based common stock warrants	0	0	(686)
Impairment of goodwill	49,075	0	0
Impairment of long-lived assets	7,963	2,888	3,338
Loss on sale of Argentina subsidiary, net of cash transferred	0	0	5,960
Changes in operating assets and liabilities:
Accounts receivable and contract assets	5,040	12,765	2,007
Inventories	51,458	(9,913)	(14,985)
Prepaid expenses and other assets	2,860	(917)	(630)
Accounts payable and accrued liabilities	(21,379)	(28,670)	870
Accrued income taxes	(3,539)	(2,074)	2,860
Net cash provided by (used for) operating activities	25,190	10,926	40,283
Cash flows from investing activities:
Purchase of term deposit	0	(7,487)	0
Redemption of term deposit	0	7,803	0
Acquisition of the net assets of Qterics, Inc.	0	(939)	0
Acquisitions of property, plant and equipment	(8,116)	(14,006)	(12,586)
Acquisitions of intangible assets	(5,761)	(6,579)	(4,455)
Net cash provided by (used for) investing activities	(13,877)	(21,208)	(17,041)
Cash flows from financing activities:
Borrowings under line of credit	78,000	133,000	112,000
Repayments on line of credit	(111,000)	(101,000)	(76,000)
Proceeds from stock options exercised	0	1,536	1,638
Treasury stock purchased	(1,779)	(13,035)	(59,664)
Net cash provided by (used for) financing activities	(34,779)	20,501	(22,026)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(523)	(4,292)	2,444
Net increase (decrease) in cash and cash equivalents	(23,989)	5,927	3,660
Cash and cash equivalents at beginning of period	66,740	60,813	57,153
Cash and cash equivalents at end of period	42,751	66,740	60,813
Supplemental cash flow information:
Income taxes paid	13,176	10,922	10,093
Interest paid	$ 7,015	$ 2,214	$ 620