Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 46,763	$ 47,010
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	25,443	24,874
Amortization	8,660	8,113
Provision for doubtful accounts	1,321	(380)
Deferred income taxes	(4,465)	(4,138)
Asset impairments	1,075	0
Gain on the sale of property, plant and equipment	(335)	(246)
Gain on assets held for sale	0	(393)
Stock-based compensation expense	12,331	13,282
Changes in operating assets and liabilities
Accounts receivable	12,937	(123,600)
Contract assets	(6,472)	(32,487)
Inventories	1,789	(228,501)
Prepaid expenses and other assets	(14,433)	(9,820)
Accounts payable	(24,420)	84,588
Advance payments from customers	(8,879)	93,476
Accrued liabilities	(14,201)	(2,043)
Operating leases	830	(638)
Income taxes	(730)	6,186
Net cash provided by (used in) operating activities	37,214	(124,717)
Cash flows from investing activities:
Additions to property, plant and equipment	(64,014)	(30,179)
Proceeds from the sale of property, plant and equipment	636	289
Proceeds from the sale of assets held for sale	0	5,372
Additions to capitalized purchased software	(2,699)	(3,415)
Other	(48)	5
Net cash used in investing activities	(66,125)	(27,928)
Cash flows from financing activities:
Debt issuance costs	(216)	(574)
Proceeds from stock options exercised	68	471
Employee taxes paid for with shares withheld	(5,804)	(3,184)
Dividends paid	(17,570)	(17,414)
Borrowings under credit agreement	614,500	593,000
Principal payments on credit agreement	(506,961)	(423,000)
Principal payments on finance leases	(129)	(123)
Share repurchases	0	(9,391)
Net cash provided by financing activities	83,888	139,785
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,647)	(9,552)
Net increase (decrease) in cash and cash equivalents and restricted cash	53,330	(22,412)
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	$ 260,760	$ 249,337