CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 59,288	$ 51,805
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	38,357	34,902
Amortization	2,818	2,429
Stock based compensation	7,511	7,748
Provision for (recovery of) doubtful accounts	94	147
Deferred income taxes	(2,733)	(2,492)
Defined benefit plan expense	4,872	4,239
Equity in results of affiliates	65	48
Changes in balance sheet items, excluding effects from foreign currency adjustments:
Accounts and other receivables	(67,484)	(35,865)
Inventories	(18,575)	(7,913)
Prepaid and other current assets	129	(13,320)
Accounts payable and accrued liabilities	26,744	26,269
Income taxes payable	3,255	1,981
Retirement and deferred compensation plan liabilities	(5,381)	(24,069)
Other changes, net	2,059	(7,733)
Net Cash Provided by Operations	51,019	38,176
Cash Flows from Investing Activities:
Capital expenditures	(40,019)	(34,848)
Proceeds from sale of property and equipment	2,848	989
Insurance proceeds	10,631
Acquisition of intangible assets	(124)
Investment in unconsolidated affiliate		(5,000)
Notes receivable, net	208	445
Net Cash Used by Investing Activities	(26,456)	(38,414)
Cash Flows from Financing Activities:
Proceeds from notes payable	8,564
Repayments of notes payable	(3,956)
Proceeds and repayments of short term credit facility, net		(163,665)
Proceeds from long-term obligations	2,524
Repayments of long-term obligations	(3,855)	(2,268)
Dividends paid	(19,830)	(19,937)
Proceeds from stock option exercises	34,880	18,705
Purchase of treasury stock	(3,905)
Common stock repurchased and retired	(12,797)	(16,019)
Net Cash Provided (Used) by Financing Activities	1,625	(183,184)
Effect of Exchange Rate Changes on Cash	5,930	1,862
Net Increase (Decrease) in Cash and Equivalents and Restricted Cash	32,118	(181,560)
Cash and Equivalents and Restricted Cash at Beginning of Period	712,640	466,287
Cash and Equivalents and Restricted Cash at End of Period	$ 744,758	$ 284,727

The amount of the payments for the repurchase and retirement of common stock.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow to reacquire common stock during the period.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration