CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012
Operating Activities:
Consolidated net income	$ 37,343	$ 38,847
Loss from discontinued operations	(5,683)	(1,061)
Income from continuing operations	43,026	39,908
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	23,481	25,350
Payments relating to restructuring activities	0	(826)
Pension plan funding	(4,155)	(7,852)
Tax benefits related to stock incentive programs	489	154
Other non-cash items	7,541	3,997
Net changes in operating assets and liabilities	(10,528)	5,911
Net cash provided by continuing operations	59,854	66,642
Net cash used in discontinued operations	(2,839)	(1,836)
Net cash provided by operating activities	57,015	64,806
Investing Activities:
Purchases of property, plant and equipment	(21,659)	(23,834)
Proceeds from sale of short-term investments	1,309	1,494
Purchases of short-term investments	(3,640)	(3,074)
Net cash used in investing activities	(23,990)	(25,414)
Financing Activities:
Repayment of long-term debt	(1,705)	(280)
Net issuance (repayment) of short-term debt	43	(1,597)
Purchase of common shares for treasury	(19,281)	(5,504)
Proceeds from issuance of stock under option plan	4,643	2,354
Excess tax benefits related to stock incentive programs	274	0
Dividends paid to non-controlling interest	(763)	(3,249)
Cash dividends paid	(3,495)	(1,775)
Net cash provided by (used in) financing activities	(20,284)	(10,051)
Effect of exchange rate changes on cash and cash equivalents	(8,768)	(3,034)
Net increase in cash and cash equivalents	3,973	26,307
Cash and cash equivalents at beginning of period	454,092	395,152
Cash and cash equivalents at end of period	458,065	421,459
Supplemental disclosure of cash flow information:
Interest paid	1,711	1,737
Income taxes paid	12,533	14,092
Non-cash financing activities:
Treasury stock purchases settled after period-end	$ 870	$ 474