CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 243,638	$ 214,090	$ 242,227
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	193,781	180,513	166,944
Amortization	41,072	39,787	27,608
Stock-based compensation	38,870	34,148	23,893
Provision for CECL in 2021 and 2020 and allowance for doubtful accounts in 2019	1,601	865	782
Loss on disposition of fixed assets	217	2,627	344
Net gain on remeasurement of equity securities	(4,709)	(64)	0
Deferred income taxes	(14,356)	(8,198)	8,746
Defined benefit plan expense	29,188	23,372	15,342
Equity in results of affiliates	692	1,443	(135)
Impairment loss	376	0	0
Change in fair value of contingent consideration	2,768	5,230	0
Changes in balance sheet items, excluding effects from foreign currency adjustments and acquisitions:
Accounts and other receivables	(123,251)	13,455	8,811
Inventories	(79,961)	13,722	605
Prepaid and other current assets	(5,538)	(3,078)	6,596
Accounts payable, accrued and other liabilities	52,305	65,592	9,997
Income taxes payable	(4,631)	(6,091)	5,658
Retirement and deferred compensation plan liabilities	(8,726)	(7,267)	(3,956)
Other changes, net	107	7	995
Net Cash Provided by Operations	363,443	570,153	514,457
Cash Flows from Investing Activities:
Capital expenditures	(307,935)	(245,954)	(242,276)
Proceeds from government grants	2,003	0	0
Proceeds from sale of property, plant and equipment	5,231	5,261	4,301
Purchase of short-term investments	(497)	(243)	0
Acquisition of business, net of cash acquired	(148,420)	(164,181)	(106,328)
Acquisition of intangible assets	0	(6,092)	(4,806)
Investment in equity securities	(6,870)	(39,628)	(3,530)
Proceeds from sale of investment in equity securities	2,434	0	16,487
Notes receivable, net	(3,185)	(1,141)	(116)
Net Cash Used by Investing Activities	(457,239)	(451,978)	(336,268)
Cash Flows from Financing Activities:
Proceeds from notes payable and overdrafts	14,931	22,342	50,854
Repayments of notes payable and overdrafts	(13,701)	(36,314)	(53,269)
Proceeds and repayments of short term revolving credit facility, net	92,863	27,000	(52,096)
Proceeds from long-term obligations	11,703	4,852	10,523
Repayments of long-term obligations	(68,845)	(64,735)	(67,276)
Payment of contingent consideration obligation	0	(2,765)	0
Dividends paid	(98,509)	(92,658)	(90,208)
Credit facility costs	(1,718)	0	0
Proceeds from stock option exercises	59,906	68,555	90,834
Purchase of treasury stock	(78,148)	0	(86,497)
Net Cash Used by Financing Activities	(81,518)	(73,723)	(197,135)
Effect of Exchange Rate Changes on Cash	(6,731)	13,545	(904)
Net (Decrease) Increase in Cash and Equivalents and Restricted Cash	(182,045)	57,997	(19,850)
Cash and Equivalents and Restricted Cash at Beginning of Period	304,970	246,973	266,823
Cash and Equivalents and Restricted Cash at End of Period	122,925	304,970	246,973
Supplemental Cash Flow Disclosure:
Interest paid	29,070	33,317	34,422
Income taxes paid	$ 94,968	$ 93,575	$ 86,097