Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 125,412	$ 173,420
Accounts receivable, net	305,495	287,781
Contract assets, net	179,223	182,281
Inventories	166,025	169,567
Income taxes prepaid and receivable	11,686	11,043
Prepaid expenses and other current assets	57,331	53,872
Total current assets	845,172	877,964
Property, plant and equipment, net	589,970	601,989
Intangibles, net	42,839	44,646
Goodwill	178,704	180,181
Deferred income taxes	24,153	22,941
Noncurrent receivables, net	0	4,392
Other assets	117,342	102,901
Total assets	1,798,180	1,835,014
Liabilities and Shareholders' Equity
Accounts payable	80,778	87,104
Accrued liabilities	118,181	142,988
Current maturities of long-term debt	4,445	4,218
Income taxes payable	8,586	14,369
Total current liabilities	211,990	248,679
Long-term debt	434,689	452,667
Other noncurrent liabilities	151,121	139,385
Deferred taxes and other liabilities	26,815	26,963
Total liabilities	824,615	867,694
Commitments and Contingencies (Note 16)
Shareholders' Equity:
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued	0	0
Additional paid in capital	449,028	448,218
Retained earnings	1,030,111	1,010,942
Accumulated items of other comprehensive income:
Translation adjustments	(137,017)	(124,901)
Pension and postretirement liability adjustments	(16,964)	(17,346)
Derivative valuation adjustment	6,955	9,079
Treasury stock (Class A), at cost; 9,661,845 shares in 2024 and 2023	(364,665)	(364,665)
Total shareholders' equity	967,489	961,368
Noncontrolling interest	6,076	5,952
Total equity	973,565	967,320
Total liabilities and shareholders' equity	1,798,180	1,835,014
Common Class A
Shareholders' Equity:
Class A Common Stock, par value $0.001 per share; authorized 100,000,000 shares; 40,898,219 issued in 2024 and 40,856,910 in 2023	$ 41	$ 41