Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 12,360	$ 10,960
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	8,320	8,294
Amortization	2,780	2,603
Provision for doubtful accounts	0	120
Deferred income taxes	(1,010)	(1,201)
Loss on the sale of property, plant and equipment	11	41
Loss on assets held for sale	0	1,983
Stock-based compensation expense	4,790	4,206
Changes in operating assets and liabilities
Accounts receivable	30,398	(26,356)
Contract assets	(10,521)	(13,431)
Inventories	(49,864)	(85,751)
Prepaid expenses and other assets	(3,712)	(8,742)
Accounts payable	15,375	35,869
Advance payments from customers	(12,129)	11,475
Accrued liabilities	(21,348)	(7,960)
Operating leases	9	(398)
Income taxes	(365)	263
Net cash used in operations	(24,906)	(68,025)
Cash flows from investing activities:
Additions to property, plant and equipment	(35,926)	(17,203)
Proceeds from the sale of property, plant and equipment	19	0
Proceeds from the sale of assets held for sale	0	1,325
Additions to capitalized purchased software	(2,805)	(772)
Other	0	5
Net cash used in investing activities	(38,712)	(16,645)
Cash flows from financing activities:
Proceeds from stock options exercised	68	459
Employee taxes paid for with shares withheld	(5,554)	(2,997)
Dividends paid	(5,806)	(5,805)
Borrowings under credit agreement	230,000	203,000
Principal payments on credit agreement	(151,641)	(130,000)
Principal payments on finance leases	(43)	(41)
Share repurchases	0	(5,482)
Net cash provided by financing activities	67,024	(59,134)
Effect of exchange rate changes	854	(1,278)
Net increase (decrease) in cash and cash equivalents and restricted cash	4,260	(26,814)
Cash and cash equivalents and restricted cash at beginning of year	207,430	271,749
Cash and cash equivalents and restricted cash at end of period	$ 211,690	$ 244,935