CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 51,805	$ 43,866
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	34,902	34,401
Amortization	2,429	1,486
Stock based compensation	7,748	10,104
Provision for doubtful accounts	147	13
Deferred income taxes	(2,492)	(867)
Defined benefit plan expense	4,239	4,194
Equity in results of affiliates	48	121
Changes in balance sheet items, excluding effects from foreign currency adjustments:
Accounts and other receivables	(35,865)	(70,863)
Inventories	(7,913)	(1,792)
Prepaid and other current assets	(13,320)	(14,646)
Accounts payable and accrued liabilities	26,269	11,362
Income taxes payable	1,981	(737)
Retirement and deferred compensation plan liabilities	(21,272)	(15,151)
Other changes, net	(7,733)	10,386
Net Cash Provided by Operations	40,973	11,877
Cash Flows from Investing Activities:
Capital expenditures	(34,848)	(24,218)
Proceeds from sale of property and equipment, including insurance proceeds	989	1,234
Maturity of short-term investments		29,485
Acquisition of business, net of cash acquired		(202,985)
Acquisition of intangible assets		(2,514)
Investment in unconsolidated affiliate	(5,000)
Notes receivable, net	445	319
Net Cash Used by Investing Activities	(38,414)	(198,679)
Cash Flows from Financing Activities:
Proceeds from (repayments of) notes payable	(163,665)	75,180
Proceeds from long-term obligations		101
Repayments of long-term obligations	(2,268)	(1,047)
Dividends paid	(19,937)	(18,770)
Proceeds from stock option exercises	15,908	20,960
Common stock repurchased and retired	(16,019)	(8,641)
Excess tax benefit from exercise of stock options		3,764
Net Cash (Used) Provided by Financing Activities	(185,981)	71,547
Effect of Exchange Rate Changes on Cash	1,862	11,326
Net (Decrease) Increase in Cash and Equivalents	(181,560)	(103,929)
Cash and Equivalents at Beginning of Period	466,287	489,901
Cash and Equivalents at End of Period	$ 284,727	$ 385,972

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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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the 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. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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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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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

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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) of financing activities, excluding 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) of investing activities, excluding 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, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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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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The cash inflow from sales, maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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