CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES
Net income	$ 88,055	$ 111,610	$ 96,508
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	82,452	70,374	62,480
Amortization	6,842	6,359	6,569
Change in deferred taxes and other liabilities	(15,331)	(2,046)	(8,496)
Impairment of property, plant, equipment, and inventory	2,038	1,773	1,808
Non-cash interest expense	1,025	1,404	1,118
Non-cash portion of pension settlement expense	0	0	42,657
Compensation and benefits paid or payable in Class A Common Stock	4,715	6,936	4,527
Provision/(recovery) for credit losses from uncollected receivables and contract assets	310	640	1,408
Foreign currency remeasurement (gain)/loss on intercompany loans	81	(2,831)	(4,434)
Fair value adjustment on foreign currency options	0	(139)	(509)
Gain on sale of assets	(513)	0	0
Changes in operating assets and liabilities that provided/(used) cash, net of impact of business acquisition:
Accounts receivable	31,764	(11,038)	(14,301)
Contract assets	12,289	(32,156)	(36,434)
Inventories	14,627	15,093	(24,541)
Prepaid expenses and other current assets	4,002	1,530	(4,134)
Income taxes prepaid and receivable	(8,574)	(2,897)	(6,005)
Accounts payable	(3,084)	(5,672)	8,572
Accrued liabilities	(1,275)	(10,441)	3,226
Income taxes payable	6,918	(1,988)	183
Noncurrent receivables	(780)	3,723	3,911
Other noncurrent liabilities	(7,702)	(9,783)	(10,133)
Other, net	582	7,605	4,234
Net cash provided by operating activities	218,441	148,056	128,214
INVESTING ACTIVITIES
Purchase of business, net of cash acquired	0	(133,470)	0
Purchases of property, plant and equipment	(80,249)	(83,560)	(93,675)
Purchased software	(958)	(869)	(2,673)
Proceeds received from sale of assets	1,027	0	0
Net cash used in investing activities	(80,180)	(217,899)	(96,348)
FINANCING ACTIVITIES
Proceeds from borrowings	145,595	78,040	162,000
Principal payments on debt	(279,838)	(92,274)	(73,000)
Principal payments on finance lease liabilities	0	0	(654)
Debt acquisition costs	0	(4,108)	0
Purchase of Treasury shares	(14,175)	0	(84,780)
Taxes paid in lieu of share issuance	(2,931)	(3,136)	(770)
Proceeds from options exercised	0	0	17
Dividends paid	(32,483)	(31,163)	(26,465)
Net cash used in financing activities	(183,832)	(52,641)	(23,652)
Effect of exchange rate changes on cash and cash equivalents	(12,566)	4,128	(18,474)
Increase/(decrease) in cash and cash equivalents	(58,137)	(118,356)	(10,260)
Cash and cash equivalents at beginning of period	173,420	291,776	302,036
Cash and cash equivalents at end of period	$ 115,283	$ 173,420	$ 291,776