CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (122,661)	$ (88,098)	$ (176,431)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation	148,329	138,956	129,712
Amortization	31,471	32,408	34,137
(Gain) loss on early extinguishment of debt	0	0	(2,254)
Deferred income tax expense (benefit)	(12,798)	2,965	(13,561)
Equity (income) loss of unconsolidated entities, net	10	761	178
Dividends from unconsolidated entities	321	0	526
Goodwill and other intangible asset impairment charges	15,866	0	119,580
Remeasurement of long-lived assets	10,695	0	0
Gain (Loss) on Disposition of Business	(10,478)	0	0
Stock-based compensation	16,650	12,916	10,796
Other, net	(13,924)	(2,749)	(11,223)
Changes in assets and liabilities:
Accounts receivable	45,864	(38,487)	94,364
Income tax refunds receivable from acquisition, reimbursable to seller	0	0	7,687
Inventories	(7,534)	(3,410)	(16,798)
Contract assets	(11,412)	3,475	11,543
Increase (Decrease) In Right-Of_Use Assets	31,546	32,479	29,171
Property, plant and equipment impairment charge	23,444	14,099	0
Accounts payable	(15,038)	(5,090)	19,264
Accrued interest payable	(413)	221	(643)
Accrued compensation	(12,477)	33,871	(3,945)
Advances on contracts and other customer advances	(13,210)	(14,160)	(11,347)
Operating lease liabilities	(30,945)	(30,698)	(28,374)
Retirement plan liabilities, net	(6,140)	(3,968)	(34,136)
Other assets and liabilities	10,897	28,957	(7,719)
Net cash provided (used) by operating activities	78,063	114,448	150,527
Cash flows from investing activities:
Purchases of property, plant and equipment	(136,591)	(139,025)	(137,160)
Proceeds from sale of businesses	57,633	0	0
Proceeds from sales of assets	17,057	6,991	10,759
Expenditures for intangible assets	(1,309)	(503)	(184)
Proceeds from notes receivable	17,023	11,238	8,605
Payments for settlement of interest rate swaps	0	0	(2,304)
Net proceeds (payments) from settlement of foreign currency forward exchange contracts	12,114	4,251	20,950
Other investing activities, net	0	463	273
Net cash used by investing activities	(34,073)	(116,585)	(99,061)
Cash flows from financing activities:
Short-term borrowings, net	(6,198)	7,027	884
Current maturities and long-term debt:
Additions	240,544	201,997	224,445
Reductions	(274,153)	(164,475)	(256,310)
Dividends paid to noncontrolling interests	(17,095)	(5)	(4,841)
Sale of noncontrolling interests	0	0	1,901
Payments to Acquire Additional Interest in Subsidiaries	(1,197)	0	0
Contributions from noncontrolling interests	874	1,654	0
Stock-based compensation - Employee taxes paid	(1,885)	(1,426)	(1,949)
Payment of contingent consideration	0	0	(6,915)
Deferred financing costs	(4,290)	0	0
Net cash (used) provided by financing activities	(63,400)	44,772	(42,785)
Effect of exchange rate changes on cash, including restricted cash	(15,046)	(3,115)	(10,715)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(34,456)	39,520	(2,034)
Cash and cash equivalents, including restricted cash, at beginning of period	124,614	85,094	87,128
Cash and cash equivalents, including restricted cash, at end of period	90,158	124,614	85,094
Supplemental Cash Flow Information [Abstract]
Change in accrual for purchases of property, plant and equipment included in accounts payable	$ 1,660	$ (7,579)	$ 10,845