Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Operating activities:
Net income	$ 68,432	$ 63,304
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	19,603	19,029
Amortization of intangibles	6,249	4,457
Stock-based compensation	7,030	5,574
Impairment of assets held for sale		549
Non-cash inventory charge	2,069	567
Excess tax benefit on share-based compensation	(3,763)	(2,471)
Loss on sale of assets	169	62
Impairment and equity in net loss of unconsolidated affiliate	10,678	3,523
Changes in operating assets and liabilities:
Accounts receivable	(16,348)	(12,756)
Inventories	(4,537)	58
Accounts payable	6,659	5,640
Accrued expenses (including post-retirement)	(11,743)	(5,234)
Accrued payroll and severance	5,492	(4,646)
Accrued taxes	(5,473)	(857)
Prepaid expenses and other	1,294	(748)
Net cash provided by operating activities	85,811	76,051
Investing activities:
Purchases of property, plant, and equipment	(25,328)	(12,797)
Acquisition of businesses, net of cash acquired	(145,000)	(34,016)
Purchase of investment		(10,000)
Purchase of short-term investments	(8,478)	(4,616)
Proceeds from sale of short-term investments		17,805
Proceeds from sale of assets	158	495
Net cash used in investing activities	(178,648)	(43,129)
FINANCING activities:
Proceeds from term loan	100,000	20,251
Proceeds from revolving credit facility	160,500
Payments of revolving credit facility	(116,000)	(17,500)
Debt issuance costs paid	(809)
Cash dividends paid	(13,789)	(12,181)
Proceeds from exercise of stock options	19,335	13,411
Excess tax benefit on share-based compensation	3,763	2,471
Net cash provided by financing activities	153,000	6,452
Effect of exchange rate changes on cash and cash equivalents	(2,631)	4,008
Increase in cash and cash equivalents	57,532	43,382
Cash and cash equivalents at beginning of period	235,404	164,016
Cash and cash equivalents at end of period	$ 292,936	$ 207,398