Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 15,996	$ 13,479	$ 99,873
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	115,818	92,150	91,085
Gain on disposition of property, plant and equipment	(1,197)	(821)	(1,027)
Stock compensation expense	10,201	12,804	11,470
Non-cash goodwill impairment charge	0	68,194	0
Changes in assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(6,073)	(39,484)	(18,793)
Inventories	622	(48,591)	(7,350)
Prepaid expenses and other current assets	1,321	(9,257)	(5,208)
Accounts payable	(5,493)	15,998	22,909
Accrued liabilities	22,673	(25,659)	(1,630)
Deferred income taxes	(16,058)	2,645	(19,354)
Long-term retirement benefits	(17,256)	(1,474)	3,423
Long-term tax liability	(13,029)	(6,948)	(6,949)
Other	4,890	2,523	(643)
Net cash provided by operating activities	112,415	75,559	167,806
Investing activities:
Proceeds from disposition of property, plant and equipment	7,921	1,825	3,007
Capital expenditures	(55,739)	(35,082)	(34,117)
Business acquisitions, net of cash acquired	718,782	0	0
Other	(921)	(2,729)	1,304
Net cash used in investing activities	(767,521)	(35,986)	(29,806)
Financing activities:
Net change in other borrowings	(257)	(1,333)	(173)
Payments on long-term debt	(314,167)	(108,415)	(115,507)
Proceeds from the issuance of long-term debt	1,019,708	98,285	48,300
Payments of debt issuance costs	(11,341)	0	0
Proceeds from the issuance of common stock	353	513	1,427
Common stock repurchases	0	(6,721)	(5,229)
Dividends paid	(32,412)	(32,376)	(32,402)
Withholding taxes paid on stock issuances	(908)	(1,144)	(1,421)
Other	5,586	(13,638)	(9,661)
Net cash used provided by financing activities	666,562	(64,829)	(114,666)
Effect of exchange rate changes on cash flows	(545)	(5,525)	(2,893)
Increase (decrease) in cash, cash equivalents and restricted cash	10,911	(30,781)	20,441
Cash, cash equivalents and restricted cash at beginning of year	81,128	111,909	91,468
Cash, cash equivalents and restricted cash at end of year	92,039	81,128	111,909
Less: Restricted cash, included in Prepaid expenses and other current assets	(2,212)	(2,135)	(4,524)
Less: Restricted cash, included in Other assets	0	(2,135)	(4,525)
Cash and cash equivalents	$ 89,827	$ 76,858	$ 102,860