CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net income	$ 89,858	$ 85,465
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	72,303	64,485
Amortization	2,482	666
Stock option based compensation	9,324	8,689
Recovery of doubtful accounts	(723)	(605)
Deferred income taxes	(6,756)	(478)
Defined benefit plan expense	9,668	7,154
Equity in results of affiliates in excess of cash distributions received	323	289
Changes in balance sheet items, excluding effects from foreign currency adjustments:
Accounts receivable	(67,815)	(40,455)
Inventories	(22,591)	(20,793)
Prepaid and other current assets	(9,670)	5,163
Accounts payable and accrued liabilities	19,745	10,447
Income taxes payable	9,258	796
Retirement and deferred compensation plans	(7,752)	(20,978)
Other changes, net	11,954	(15,680)
Net Cash Provided by Operations	109,608	84,165
Cash Flows from Investing Activities:
Capital expenditures	(71,741)	(95,351)
Disposition of property and equipment	2,946	1,229
Investment in unconsolidated affiliate	(13)	(279)
Notes receivable, net	(159)	95
Net Cash Used by Investing Activities	(68,967)	(94,306)
Cash Flows from Financing Activities:
Repayments of notes payable	(37,407)	(53,792)
Proceeds from long-term obligations		539
Repayments of long-term obligations	(1,537)
Dividends paid	(33,103)	(29,175)
Credit facility costs	(498)	(1,121)
Proceeds from stock option exercises	31,100	25,003
Purchase of treasury stock	(44,588)	(10,096)
Excess tax benefit from exercise of stock options	3,912	4,380
Net Cash Used by Financing Activities	(82,121)	(64,262)
Effect of Exchange Rate Changes on Cash	1,715	(2,340)
Net Decrease in Cash and Equivalents	(39,765)	(76,743)
Cash and Equivalents at Beginning of Period	229,755	377,616
Cash and Equivalents at End of Period	$ 189,990	$ 300,873