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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Operating Activities:      
Net income $ 199,295 $ 191,624 $ 171,926
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation 134,647 146,893 144,923
Amortization 4,246 5,325 5,033
Stock based compensation 20,612 19,749 14,392
(Recovery of) provision for doubtful accounts (813) 741 (385)
Deferred income taxes (7,141) (18,973) 6,844
Defined benefit plan expense 20,685 16,699 19,408
Equity in results of affiliates in excess of cash distributions received 718 1,917 883
Changes in balance sheet items, excluding effects from foreign currency adjustments:      
Accounts and other receivable (27,759) (16,322) (32,806)
Inventories (18,925) 5,205 (29,918)
Prepaid and other current assets (6,982) (6,496) (6,394)
Accounts payable and accrued liabilities 39,330 (24,319) 1,144
Income taxes payable 3,397 (10,949) 16,712
Retirement and deferred compensation plan liabilities (29,576) (370) (19,441)
Other changes, net (7,219) 5,605 (6,221)
Net Cash Provided by Operations 324,515 316,329 286,100
Cash Flows from Investing Activities:      
Capital expenditures (149,323) (161,940) (151,510)
Proceeds from sale of property and equipment 827 5,106 436
Insurance proceeds on property claim 3,739    
Purchase of short-term investments (32,769)    
Intangible assets   (9) (725)
Investment in unconsolidated affiliate     (5,256)
Notes receivable, net 1,296 (2,357) (65)
Net Cash Used by Investing Activities (176,230) (159,200) (157,120)
Cash Flows from Financing Activities:      
Proceeds from Notes Payable   95,816 94,184
Repayments of notes payable (227,362)    
Proceeds from long-term obligations 209,236 253,520 2,994
Repayments of long-term obligations (981) (778) (28,320)
Dividends paid (71,247) (71,072) (66,133)
Credit facility costs (1,216) (720) (498)
Proceeds from stock option exercises 64,003 36,015 42,684
Purchase of treasury stock   (340,517) (118,813)
Common stock repurchased and retired (13,887)    
Excess tax benefit from exercise of stock options 8,388 6,998 6,104
Net Cash Used by Financing Activities (33,066) (20,738) (67,798)
Effect of Exchange Rate Changes on Cash (25,080) (46,490) 18,924
Net increase in Cash and Equivalents 90,139 89,901 80,106
Cash and Equivalents at Beginning of Period 399,762 309,861 229,755
Cash and Equivalents at End of Period 489,901 399,762 309,861
Supplemental Cash Flow Disclosure:      
Interest paid 31,664 20,352 20,679
Income taxes paid $ 79,502 $ 94,578 $ 47,445