Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income	$ 99,873	$ 63,375	$ 158,350
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	91,085	87,656	99,059
(Gain) loss on disposition of property, plant and equipment	(1,027)	(94)	236
Stock compensation expense	11,470	10,300	13,306
Seeger divestiture charges	0	6,677	0
Non-cash impairment charge related to divestiture	0	0	5,600
Changes in assets and liabilities, net of the effects of divestitures:
Accounts receivable	(18,793)	107,381	29,212
Inventories	(7,350)	2,147	11,482
Prepaid expenses and other current assets	(5,208)	(5,721)	(10,640)
Accounts payable	22,909	(9,968)	(22,546)
Accrued liabilities	(1,630)	(37,430)	2,336
Deferred income taxes	(19,354)	(5,867)	(12,025)
Long-term retirement benefits	3,423	(1,418)	(16,233)
Long-term tax liability	(6,949)	(6,949)	(6,949)
Other	(643)	5,373	(2,887)
Net cash provided by operating activities	167,806	215,462	248,301
Investing activities:
Proceeds from disposition of property, plant and equipment	3,007	449	577
Proceeds from the sale of businesses, net of cash sold	0	36,062	0
Capital expenditures	(34,117)	(40,698)	(53,286)
Business acquisitions, net of cash acquired	0	0	(6,061)
Other	1,304	0	(3,450)
Net cash used in investing activities	(29,806)	(4,187)	(62,220)
Financing activities:
Net change in other borrowings	(173)	(5,855)	5,490
Payments on long-term debt	(115,507)	(266,424)	(341,419)
Proceeds from the issuance of long-term debt	48,300	98,107	236,552
Proceeds from the issuance of common stock	1,427	1,989	5,492
Common stock repurchases	(5,229)	(15,550)	(50,347)
Dividends paid	(32,402)	(32,402)	(32,544)
Withholding taxes paid on stock issuances	(1,421)	(3,368)	(6,059)
Other	(9,661)	3,837	(9,158)
Net cash used provided by financing activities	(114,666)	(219,666)	(191,993)
Effect of exchange rate changes on cash flows	(2,893)	6,054	(1,002)
Increase (decrease) in cash, cash equivalents and restricted cash	20,441	(2,337)	(6,914)
Cash, cash equivalents and restricted cash at beginning of year	91,468	93,805	100,719
Cash, cash equivalents and restricted cash at end of year	111,909	91,468	93,805
Cash and cash equivalents	102,860	79,145	93,805
Prepaid expenses and other current assets
Financing activities:
Restricted cash	(4,524)	(4,944)	0
Other assets
Financing activities:
Restricted cash	$ (4,525)	$ (7,379)	$ 0