CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010
Operating Activities:
Consolidated net income	$ 50,190	$ 53,204
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	43,724	49,479
Payments relating to restructuring activities	(2,360)	(4,439)
Other non-cash items	5,799	4,649
Tax benefits related to stock incentive programs	428	56
Net changes in operating assets and liabilities	(4,904)	5,115
Net cash provided by operating activities	92,877	108,064
Investing Activities:
Purchases of property, plant and equipment	(36,913)	(24,069)
Proceeds from sale of short-term investments	7,170	3,258
Purchases of short-term investments	(8,221)	(6,681)
Net cash used in investing activities	(37,964)	(27,492)
Financing Activities:
Repayment of long-term debt	0	(4,600)
Proceeds from issuance of long-term debt	1,596	0
Net proceeds (repayment) of short-term debt	1,463	(1,261)
Purchase of common shares for treasury	(43,432)	(15,543)
Proceeds from issuance of stock under option plan	5,078	504
Cash dividends paid	(2,719)	(2,799)
Excess tax benefits related to stock incentive programs	158	21
Net cash used in financing activities	(37,856)	(23,678)
Effect of exchange rate changes on cash and cash equivalents	(2,356)	(5,947)
Net increase in cash and cash equivalents	14,701	50,947
Cash and cash equivalents at beginning of period	367,827	310,946
Cash and cash equivalents at end of period	382,528	361,893
Supplemental disclosure of cash flow information:
Interest paid	1,871	1,670
Income taxes paid	22,698	20,427
Non-cash financing activities:
Treasury stock purchases settled after period-end	$ 1,575	$ 0