CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net income (loss)	$ (3,505)	$ 16,600
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	14,653	10,724
Equity compensation expense	2,053	3,202
Deferred income taxes	(7,356)	(2,013)
Equity in undistributed income of unconsolidated joint ventures	(76)	(1,275)
Dividends received from unconsolidated joint ventures	1,457	1,509
Pension and other postretirement benefits	0	29
(Gain) loss on sale or disposal of property, plant and equipment	18	(15)
UTIS fire fixed asset and inventory write-offs	0	201
Provision (benefit) for credit losses	90	(142)
Changes in assets and liabilities:
Accounts receivable	2,566	(14,384)
Proceeds from insurance/government subsidies related to operations	500	334
Contract assets	(7,934)	(3,121)
Inventories	3,933	(19,935)
Pension and postretirement benefit contributions	(3)	(24)
Other current assets	5,445	(11,099)
Accounts payable and other accrued expenses	(8,766)	(4,809)
Other, net	(1,240)	10,495
Net cash provided by (used in) operating activities	1,835	(13,723)
Investing Activities:
Disposition of business	989	0
Capital expenditures	(16,410)	(28,249)
Proceeds from insurance claims	0	2,262
Net cash used in investing activities	(15,421)	(25,987)
Financing Activities:
Repayment of debt principal and finance lease obligations	(25,118)	(146)
Line of credit issuance costs	(1,742)	0
Payments of taxes related to net share settlement of equity awards	(2,506)	(10,498)
Proceeds from issuance of shares to employee stock purchase plan	0	950
Net cash used in financing activities	(29,366)	(9,694)
Effect of exchange rate fluctuations on cash	826	(748)
Net decrease in cash and cash equivalents	(42,126)	(50,152)
Cash and cash equivalents at beginning of period	235,850	232,296
Cash and cash equivalents at end of period	193,724	182,144
Supplemental Disclosures:
Accrued capital additions	2,064	14,021
Interest, net of amounts capitalized	3,547	1,068
Income taxes	$ 4,002	$ 7,600