CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 48,408	$ 39,978
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	35,849	34,934
Amortization	1,398	1,237
Stock based compensation	8,396	6,534
Provision/(Recovery) for doubtful accounts	716	(311)
Deferred income taxes	(2,048)	(4,668)
Defined benefit plan expense	4,226	5,123
Equity in results of affiliates in excess of cash distributions received	1,546	262
Changes in balance sheet items, excluding effects from foreign currency adjustments:
Accounts receivable	(67,150)	(52,022)
Inventories	(6,007)	(9,720)
Prepaid and other current assets	(5,666)	(8,947)
Accounts payable and accrued liabilities	6,320	5,528
Income taxes payable	(5,097)	4,509
Retirement and deferred compensation plans	(3,174)	(3,118)
Other changes, net	14,329	6,790
Net Cash Provided by Operations	32,046	26,109
Cash Flows from Investing Activities:
Capital expenditures	(42,914)	(34,832)
Disposition of property and equipment	2,378	2,162
Net Cash Used by Investing Activities	(40,536)	(32,670)
Cash Flows from Financing Activities:
Proceeds from notes payable	35,609	14,754
Repayments of long-term obligations	(293)	(585)
Dividends paid	(16,366)	(16,493)
Credit facility costs	(299)	(497)
Proceeds from stock option exercises	7,770	19,540
Purchase of treasury stock	(12,999)	(10,768)
Excess tax benefit from exercise of stock options	1,590	2,403
Net Cash Provided by Financing Activities	15,012	8,354
Effect of Exchange Rate Changes on Cash	794	(6,444)
Net Increase/(Decrease) in Cash and Equivalents	7,316	(4,651)
Cash and Equivalents at Beginning of Period	309,861	229,755
Cash and Equivalents at End of Period	$ 317,177	$ 225,104