CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net income	$ 16,600	$ 31,218
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	10,724	10,325
Equity compensation expense	3,202	4,006
Deferred income taxes	(2,013)	1,570
Equity in undistributed income of unconsolidated joint ventures	(1,275)	(2,181)
Dividends received from unconsolidated joint ventures	1,509	1,754
Pension and other postretirement benefits	29	(79)
(Gain) loss on sale or disposal of property, plant and equipment	(15)	(89)
UTIS fire fixed asset and inventory write-offs	201	1,171
Provision (benefit) for credit losses	(142)	(345)
Changes in assets and liabilities:
Accounts receivable	(14,384)	(11,397)
Proceeds from insurance/government subsidies related to operations	334	0
Contract assets	(3,121)	(4,361)
Inventories	(19,935)	(6,894)
Pension and postretirement benefit contributions	(24)	(147)
Other current assets	(11,099)	(6,132)
Accounts payable and other accrued expenses	(4,809)	17,967
Other, net	10,495	135
Net cash (used in) provided by operating activities	(13,723)	36,521
Investing Activities:
Capital expenditures	(28,249)	(3,602)
Proceeds from insurance claims	2,262	0
Net cash used in investing activities	(25,987)	(3,602)
Financing Activities:
Repayment of debt principal and finance lease obligations	(146)	(21,253)
Payments of taxes related to net share settlement of equity awards	(10,498)	(2,632)
Proceeds from issuance of shares to employee stock purchase plan	950	704
Net cash used in financing activities	(9,694)	(23,181)
Effect of exchange rate fluctuations on cash	(748)	(2,414)
Net (decrease) increase in cash and cash equivalents	(50,152)	7,324
Cash and cash equivalents at beginning of period	232,296	191,785
Cash and cash equivalents at end of period	182,144	199,109
Supplemental Disclosures:
Accrued capital additions	14,021	2,814
Interest, net of amounts capitalized	1,068	607
Income taxes	$ 7,600	$ 9,337