CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 116,994	$ 102,917
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	69,638	72,042
Amortization	4,935	4,235
Stock based compensation	11,719	14,405
Provision for doubtful accounts	49	245
Deferred income taxes	1,091	35
Defined benefit plan expense	8,547	8,423
Equity in results of affiliates	70	172
Changes in balance sheet items, excluding effects from foreign currency adjustments:
Accounts and other receivables	(45,760)	(80,728)
Inventories	(5,971)	(16,757)
Prepaid and other current assets	(10,602)	(18,541)
Accounts payable and accrued liabilities	29,147	7,698
Income taxes payable	(2,150)	(683)
Retirement and deferred compensation plan liabilities	(22,331)	(15,141)
Other changes, net	(6,454)	5,894
Net Cash Provided by Operations	148,922	84,216
Cash Flows from Investing Activities:
Capital expenditures	(66,705)	(56,942)
Proceeds from sale of property and equipment, including insurance proceeds	978	1,446
Maturity of short-term investments		29,485
Acquisition of business, net of cash acquired		(202,985)
Acquisition of intangible assets		(2,493)
Investment in unconsolidated affiliate	(5,000)
Notes receivable, net	396	324
Net Cash Used by Investing Activities	(70,331)	(231,165)
Cash Flows from Financing Activities:
Proceeds from (repayments of) notes payable	(167,014)	59,330
Proceeds from long-term obligations	2,535	78
Repayments of long-term obligations	(4,727)	(2,343)
Dividends paid	(39,932)	(37,717)
Proceeds from stock option exercises	60,484	38,947
Purchase of treasury stock	(26,728)
Common stock repurchased and retired	(40,994)	(48,683)
Excess tax benefit from exercise of stock options		6,884
Net Cash (Used) Provided by Financing Activities	(216,376)	16,496
Effect of Exchange Rate Changes on Cash	8,413	2,216
Net (Decrease) Increase in Cash and Equivalents	(129,372)	(128,237)
Cash and Equivalents at Beginning of Period	466,287	489,901
Cash and Equivalents at End of Period	$ 336,915	$ 361,664

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

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

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Amount of increase (decrease) in prepaid expenses, and assets classified as other.

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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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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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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