CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010
Operating Activities:
Consolidated net income	$ 33,846	$ 35,735
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	29,179	33,291
Payments relating to restructuring activities	(1,756)	(2,812)
Other non-cash items	3,271	3,693
Tax benefits related to stock incentive programs	407	43
Net changes in operating assets and liabilities	(8,256)	5,516
Net cash provided by operating activities	56,691	75,466
Investing Activities:
Purchases of property, plant and equipment	(21,943)	(16,036)
Proceeds from sale of short-term investments	5,251	1,381
Purchases of short-term investments	(4,336)	(3,008)
Net cash used in investing activities	(21,028)	(17,663)
Financing Activities:
Proceeds from issuance of long-term debt	1,596	0
Net issuance (repayment) of short-term debt	320	(2,128)
Purchase of common shares for treasury	(23,292)	(10,429)
Proceeds from issuance of stock under option plan	4,821	238
Cash dividends paid	(1,823)	(1,872)
Excess tax benefits related to stock incentive programs	153	19
Net cash used in financing activities	(18,225)	(14,172)
Effect of exchange rate changes on cash and cash equivalents	10,841	(17,800)
Net increase in cash and cash equivalents	28,279	25,831
Cash and cash equivalents at beginning of period	367,827	310,946
Cash and cash equivalents at end of period	396,106	336,777
Supplemental disclosure of cash flow information:
Interest paid	1,634	1,578
Income taxes paid	15,832	11,317
Non-cash financing activities:
Treasury stock purchases settled after period-end	$ 345	$ 422