Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 68,229	$ 35,770	$ 14,055
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	33,339	35,003	37,739
Amortization	10,913	9,149	11,053
Provision for doubtful accounts	489	0	2,160
Deferred income taxes	(7,248)	(6,883)	(7,312)
Asset impairments	0	4,357	6,950
Loss (gain) on the sale of property, plant and equipment	(289)	148	(155)
Gain on assets held for sale	(393)	0	0
Stock-based compensation expense	18,485	15,262	10,398
Changes in operating assets and liabilities:
Accounts receivable	(136,455)	(46,967)	13,586
Contract assets	(28,370)	(12,464)	18,282
Inventories	(206,247)	(197,867)	(10,799)
Prepaid expenses and other assets	(6,467)	(12,201)	4,080
Accounts payable	(16,656)	139,952	(15,553)
Advance payments from customers	79,813	34,002	46,611
Accrued liabilities	6,303	(508)	(9,826)
Operating leases	441	(167)	724
Income taxes	6,646	792	(1,555)
Net cash (used in) provided by operations	(177,467)	(2,622)	120,438
Cash flows from investing activities:
Additions to property, plant and equipment	(43,357)	(38,794)	(34,584)
Proceeds from the sale of property, plant and equipment	321	239	368
Proceeds from the sale of assets held for sale	5,372	0	0
Additions to purchased software	(3,417)	(3,383)	(4,935)
Cash received from business divestitures	0	0	4,714
Other	(93)	63	54
Net cash used in investing activities	(41,174)	(41,875)	(34,383)
Cash flows from financing activities:
Debt issuance costs	(574)	(1,150)	0
Proceeds from stock options exercised	716	346	958
Employee taxes paid for with shares withheld	(3,201)	(3,174)	(2,236)
Dividends paid	(23,156)	(23,260)	(23,041)
Borrowings under credit agreement	828,000	150,000	110,000
Borrowings under finance leases	0	0	864
Principal payments on credit agreement	(633,000)	(155,625)	(117,500)
Principal payments on finance leases	(165)	(873)	(1,351)
Share repurchases	(9,391)	(40,216)	(25,220)
Net cash provided by (used in) financing activities	159,229	(73,952)	(57,526)
Effect of exchange rate changes	(4,907)	(5,792)	3,505
Net (decrease) increase in cash and cash equivalents and restricted cash	(64,319)	(124,241)	32,034
Cash and cash equivalents and restricted cash at beginning of year	271,749	395,990	363,956
Cash and cash equivalents and restricted cash at end of period	$ 207,430	$ 271,749	$ 395,990