CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 191,624us-gaap_ProfitLoss	$ 171,926us-gaap_ProfitLoss	$ 162,420us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	146,893us-gaap_Depreciation	144,923us-gaap_Depreciation	133,845us-gaap_Depreciation
Amortization	5,325us-gaap_AdjustmentForAmortization	5,033us-gaap_AdjustmentForAmortization	3,177us-gaap_AdjustmentForAmortization
Stock option based compensation	17,971us-gaap_ShareBasedCompensation	13,728us-gaap_ShareBasedCompensation	12,695us-gaap_ShareBasedCompensation
Provisions for / (recoveries of) bad debts	741us-gaap_ProvisionForDoubtfulAccounts	(385)us-gaap_ProvisionForDoubtfulAccounts	(595)us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	(18,973)us-gaap_DeferredIncomeTaxExpenseBenefit	6,844us-gaap_DeferredIncomeTaxExpenseBenefit	(9,015)us-gaap_DeferredIncomeTaxExpenseBenefit
Defined benefit plan expense	16,699	19,408	14,611
Equity in results of affiliates	1,917	883	457
Changes in balance sheet items, excluding effects from foreign currency adjustments and impact of acquisition:
Accounts and other receivables	(16,322)	(32,806)	16,689
Inventories	5,205us-gaap_IncreaseDecreaseInInventories	(29,918)us-gaap_IncreaseDecreaseInInventories	(19,712)us-gaap_IncreaseDecreaseInInventories
Prepaid and other current assets	(6,496)	(6,394)	10,124
Accounts payable and accrued liabilities	(24,319)	1,144	(824)
Income taxes payable	(10,949)	16,712	2,969
Retirement and deferred compensation plan liabilities	(370)	(19,441)	(2,073)
Other changes, net	5,605	(6,221)	(10,876)
Net cash provided by operations	314,551	285,436	313,892
Cash Flows from Investing Activities:
Capital expenditures	(161,940)	(151,510)	(174,053)
Disposition of property and equipment	5,106	436	2,629
Intangible assets	(9)	(725)
Acquisition of business, net of cash acquired			(187,840)
Investment in unconsolidated affiliate		(5,256)	(279)
Notes receivable, net	(2,357)	(65)	84
Net cash used by investing activities	(159,200)	(157,120)	(359,459)
Cash Flows from Financing Activities:
Proceeds from notes payable	95,816us-gaap_ProceedsFromNotesPayable	94,184us-gaap_ProceedsFromNotesPayable
Repayments of notes payable			(134,034)us-gaap_RepaymentsOfNotesPayable
Proceeds from long-term obligations	253,520	2,994	125,000
Repayments of long-term obligations	(778)us-gaap_RepaymentsOfLongTermDebt	(28,320)us-gaap_RepaymentsOfLongTermDebt	(3,042)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(71,072)us-gaap_PaymentsOfDividendsCommonStock	(66,133)us-gaap_PaymentsOfDividendsCommonStock	(58,442)us-gaap_PaymentsOfDividendsCommonStock
Credit facility costs	(720)us-gaap_PaymentsOfDebtIssuanceCosts	(498)us-gaap_PaymentsOfDebtIssuanceCosts	(1,518)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from stock option exercises	37,793	43,348	44,637
Purchase of treasury stock	(340,517)	(118,813)	(79,793)
Excess tax benefit from exercise of stock options	6,998	6,104	7,809
Net cash used by financing activities	(18,960)	(67,134)	(99,383)
Effect of Exchange Rate Changes on Cash	(46,490)	18,924	(2,911)
Net increase/(decrease) in Cash and Equivalents	89,901	80,106	(147,861)
Cash and Equivalents at Beginning of Period	309,861	229,755	377,616
Cash and Equivalents at End of Period	399,762	309,861	229,755
Supplemental Cash Flow Disclosure:
Interest paid	20,352us-gaap_InterestPaid	20,679us-gaap_InterestPaid	17,464us-gaap_InterestPaid
Income taxes paid	$ 94,578us-gaap_IncomeTaxesPaid	$ 47,445us-gaap_IncomeTaxesPaid	$ 64,523us-gaap_IncomeTaxesPaid

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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