Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Operating activities:
Net income	$ 36,178	$ 39,532
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,607	13,513
Amortization	4,646	4,870
Share-based compensation expense	3,769	3,934
Other	2,760	1,376
Changes in operating assets and liabilities:
Trade accounts receivable and notes receivable	(19,485)	(10,335)
Inventories	(3,135)	(10,997)
Accounts payable and accrued liabilities	(5,359)	744
Other current assets	2,353	(797)
Income taxes payable and refundable income taxes	7,524	2,679
Other	(1,603)	(1,013)
Net cash provided by operating activities	42,255	43,506
Investing activities:
Acquisition of property, plant and equipment	(34,131)	(30,117)
Acquisition of business, net of cash acquired	(13,358)	(2,961)
Proceeds from maturities of short-term investments	20,000	0
Proceeds from sale of assets held for sale	6,500	0
Other	47	183
Net cash used in investing activities	(20,942)	(32,895)
Financing activities:
Issuance of common stock	6,322	4,194
Repurchase and retirement of common stock	(9,382)	(427)
Other	941	827
Net cash (used in) provided by financing activities	(2,119)	4,594
Effect of exchange rate changes on cash and cash equivalents	(6,202)	(1,933)
Increase in cash and cash equivalents	12,992	13,272
Cash and cash equivalents at beginning of period	330,419	273,593
Cash and cash equivalents at end of period	343,411	286,865
Supplemental Cash Flow Information
Equipment purchases in accounts payable	$ 4,129	$ 0