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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net income $ 162,420 $ 183,630 $ 173,589
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation 133,845 132,048 129,339
Amortization 3,177 2,195 3,620
Stock option based compensation 12,695 13,753 11,215
Provision for/(recoveries of) bad debts (595) 1,642 (252)
Deferred income taxes (9,015) 2,004 503
Defined benefit plan expense 14,611 10,908 8,622
Equity in results of affiliates in excess of cash distributions received 457 17 (15)
Changes in balance sheet items, excluding effects from foreign currency adjustments and impact of acquisition:      
Accounts and other receivables 16,689 (44,997) (50,143)
Inventories (19,712) (22,332) (47,388)
Prepaid and other current assets 10,124 (34,252) 4,390
Accounts payable and accrued liabilities (824) 5,271 59,147
Income taxes payable 2,969 (9,615) 9,306
Retirement and deferred compensation plan liabilities 9,985 9,747 (5,657)
Other changes, net (22,934) 11,023 (17,581)
Net cash provided by operations 313,892 261,042 278,695
Cash Flows from Investing Activities:      
Capital expenditures (174,053) (179,692) (118,804)
Disposition of property and equipment 2,629 1,838 1,398
Intangible assets     (459)
Acquisition of business, net of cash acquired (187,840) (14,883) (3,014)
Investment in unconsolidated affiliate (279) (3,145)  
Notes receivable, net 84 59 (120)
Net cash used by investing activities (359,459) (195,823) (120,999)
Cash Flows from Financing Activities:      
Proceeds from notes payable   134,563  
Repayments of notes payable (134,034)   (57,860)
Proceeds from long-term obligations 125,000 10,773 101,618
Repayments of long-term obligations (3,042) (50,490) (26,766)
Dividends paid (58,442) (53,308) (44,485)
Credit facility costs (1,518)    
Proceeds from stock option exercises 44,637 26,078 28,820
Purchase of treasury stock (79,793) (102,595) (86,473)
Excess tax benefit from exercise of stock options 7,809 6,433 5,555
Net cash used by financing activities (99,383) (28,546) (79,591)
Effect of Exchange Rate Changes on Cash (2,911) (35,484) (34,642)
Net (decrease)/increase in Cash and Equivalents (147,861) 1,189 43,463
Cash and Equivalents at Beginning of Period 377,616 376,427 332,964
Cash and Equivalents at End of Period 229,755 377,616 376,427
Supplemental Cash Flow Disclosure:      
Interest paid 17,464 17,120 15,701
Income taxes paid $ 64,523 $ 79,367 $ 77,101