Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES
Net income	$ 81,066	$ 78,267
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	50,164	46,864
Amortization	4,614	5,044
Change in deferred taxes and other liabilities	(1,264)	(15,582)
Impairment of property, plant, equipment, and inventory	577	2,610
Non-cash interest expense	1,148	840
Non-cash portion of pension settlement expense	0	42,657
Compensation and benefits paid or payable in Class A Common Stock	5,189	3,282
Provision for credit losses from uncollected receivables and contract assets	641	885
Foreign currency remeasurement (gain) on intercompany loans	(4,704)	(6,629)
Fair value adjustment on foreign currency options	581	(409)
Changes in operating assets and liabilities that provided/(used) cash, net of impact of business acquisition:
Accounts receivable	(18,172)	(20,260)
Contract assets	(16,550)	(37,201)
Inventories	(293)	(24,895)
Prepaid expenses and other current assets	(3,030)	(2,733)
Income taxes prepaid and receivable	1,597	(2,179)
Accounts payable	(6,661)	5,081
Accrued liabilities	(16,454)	(12,624)
Income taxes payable	(5,810)	2,639
Noncurrent receivables	2,276	2,976
Other noncurrent liabilities	(3,602)	(5,960)
Other, net	2,499	4,634
Net cash provided by operating activities	73,812	67,307
INVESTING ACTIVITIES
Purchase of business, net of cash acquired	(133,470)	0
Purchases of property, plant and equipment	(48,850)	(50,948)
Purchased software	(276)	(1,884)
Net cash used in investing activities	(182,596)	(52,832)
FINANCING ACTIVITIES
Proceeds from borrowings	71,249	145,000
Principal payments on debt	(51,479)	(48,000)
Principal payments on finance lease liabilities	0	(654)
Debt acquisition costs	(4,108)	0
Purchase of Treasury shares	0	(84,780)
Taxes paid in lieu of share issuance	(3,136)	(770)
Proceeds from options exercised	0	17
Dividends paid	(23,365)	(19,932)
Net cash used in financing activities	(10,839)	(9,119)
Effect of exchange rate changes on cash and cash equivalents	(647)	(30,910)
Decrease in cash and cash equivalents	(120,270)	(25,554)
Cash and cash equivalents at beginning of period	291,776	302,036
Cash and cash equivalents at end of period	$ 171,506	$ 276,482