Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES
Net income	$ 10,823	$ 30,942	$ 78,267	$ 89,992
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	15,588	15,925	46,864	48,485
Amortization	1,446	2,289	5,044	6,862
Change in deferred taxes and other liabilities	(18,178)	1,606	(15,582)	7,022
Impairment of property, plant, equipment, and inventory	(52)	25	2,610	563
Non-cash interest expense	279	283	840	593
Non-cash portion of pension settlement expense	42,657	0	42,657	0
Compensation and benefits paid or payable in Class A Common Stock	835	606	3,282	2,232
Provision/(recovery) for credit losses from uncollected receivables and contract assets	(441)	(1,075)	885	(1,158)
Foreign currency remeasurement (gain)/loss on intercompany loans	(5,369)	480	(6,629)	(551)
Fair value adjustment on foreign currency options	(28)	29	(409)	169
Changes in operating assets and liabilities that provided/(used) cash:
Accounts receivable	(5,853)	(10,927)	(20,260)	(14,292)
Contract assets	(13,333)	(3,473)	(37,201)	22,170
Inventories	(3,760)	546	(24,895)	(9,838)
Prepaid expenses and other current assets	1,741	3,949	(2,733)	2,444
Income taxes prepaid and receivable	(2,119)	2,717	(2,179)	2,408
Accounts payable	(2,395)	(296)	5,081	4,312
Accrued liabilities	(879)	5,112	(12,624)	(12,311)
Income taxes payable	10,378	2,871	2,639	(1,085)
Noncurrent receivables	1,112	1,245	2,976	2,832
Other noncurrent liabilities	(2,708)	(1,319)	(5,960)	(5,582)
Other, net	(150)	1,324	4,634	3,232
Net cash provided by operating activities	29,594	52,859	67,307	148,499
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(15,289)	(8,918)	(50,948)	(31,754)
Purchased software	(1,518)	(106)	(1,884)	(394)
Net cash used in investing activities	(16,807)	(9,024)	(52,832)	(32,148)
FINANCING ACTIVITIES
Proceeds from borrowings	10,000	0	145,000	8,000
Principal payments on debt	(48,000)	0	(48,000)	(56,009)
Principal payments on finance lease liabilities	0	(363)	(654)	(1,067)
Purchase of Treasury shares	0	0	(84,780)	0
Taxes paid in lieu of share issuance	0	0	(770)	(998)
Proceeds from options exercised	10	4	17	153
Dividends paid	(6,533)	(6,476)	(19,932)	(19,418)
Net cash used in financing activities	(44,523)	(6,835)	(9,119)	(69,339)
Effect of exchange rate changes on cash and cash equivalents	(12,652)	(4,113)	(30,910)	(2,111)
(Decrease)/increase in cash and cash equivalents	(44,388)	32,887	(25,554)	44,901
Cash and cash equivalents at beginning of period	320,870	253,330	302,036	241,316
Cash and cash equivalents at end of period	$ 276,482	$ 286,217	$ 276,482	$ 286,217