Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 173,420	$ 291,776
Accounts receivable, net	287,781	200,018
Contract assets, net	182,281	148,695
Inventories	169,567	139,050
Income taxes prepaid and receivable	11,043	7,938
Prepaid expenses and other current assets	53,872	50,962
Total current assets	877,964	838,439
Property, plant and equipment, net	601,989	445,658
Intangibles, net	44,646	33,811
Goodwill	180,181	178,217
Deferred income taxes	22,941	15,196
Noncurrent receivables, net	4,392	27,913
Other assets	102,901	103,021
Total assets	1,835,014	1,642,255
Current liabilities:
Accounts payable	87,104	69,707
Accrued liabilities	142,988	126,385
Current maturities of long-term debt	4,218	0
Income taxes payable	14,369	15,224
Total current liabilities	248,679	211,316
Long-term debt	452,667	439,000
Other noncurrent liabilities	139,385	108,758
Deferred taxes and other liabilities	26,963	15,638
Total liabilities	867,694	774,712
Commitments and Contingencies (Note 21)
Shareholders’ Equity:
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued	0	0
Additional paid-in capital	448,218	441,540
Retained earnings	1,010,942	931,318
Accumulated items of other comprehensive income:
Translation adjustments	(124,901)	(146,851)
Pension and postretirement liability adjustments	(17,346)	(15,783)
Derivative valuation adjustment	9,079	17,707
Treasury stock (Class A), at cost; 9,661,845 shares in 2023 and 9,674,542 in 2022	(364,665)	(364,923)
Total Company shareholders’ equity	961,368	863,049
Noncontrolling interest	5,952	4,494
Total shareholders' equity	967,320	867,543
Total liabilities and shareholders’ equity	$ 1,835,014	$ 1,642,255
Treasury stock, common shares (in shares)	9,661,845	9,674,542
Common Class A
Shareholders’ Equity:
Class A Common Stock, par value $0.001 per share; authorized 100,000,000 shares; issued 40,856,910 in 2023 and 40,785,434 in 2022	$ 41	$ 41