Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Operating activities:
Net income	$ 53,985	$ 57,569
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	21,812	20,862
Amortization	6,989	7,259
Share-based compensation expense	5,859	8,030
Other	4,148	515
Changes in operating assets and liabilities:
Trade accounts receivable and notes receivable	(16,722)	(4,290)
Inventories	(2,555)	(9,623)
Accounts payable and accrued liabilities	(970)	1,528
Other current assets	391	(1,488)
Income taxes payable and refundable income taxes	5,239	(546)
Other	(3,483)	(2,995)
Net cash provided by operating activities	74,693	76,821
Investing activities:
Acquisition of property, plant and equipment	(49,030)	(39,116)
Acquisition of business, net of cash acquired	(13,358)	(2,961)
Purchase of short-term investments	0	(7,996)
Proceeds from maturities of short-term investments	20,000	0
Proceeds from sales of assets held for sale	6,500	0
Other	188	184
Net cash used in investing activities	(35,700)	(49,889)
Financing activities:
Issuance of common stock	6,667	4,689
Repurchase and retirement of common stock	(14,826)	(427)
Other	1,125	1,336
Net cash (used in) provided by financing activities	(7,034)	5,598
Effect of exchange rate changes on cash and cash equivalents	(3,596)	1,707
Increase in cash and cash equivalents	28,363	34,237
Cash and cash equivalents at beginning of period	330,419	273,593
Cash and cash equivalents at end of period	358,782	307,830
Supplemental Cash Flow Information
Equipment purchases in accounts payable	$ 1,952	$ 0