Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Operating activities:
Net income	$ 79,907	$ 65,126
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	21,736	19,603
Amortization of intangibles	9,451	6,249
Stock-based compensation	7,168	7,030
Non-cash inventory charge	2,769	2,069
Excess tax benefit on share-based compensation	(2,477)	(3,763)
Loss on sale of assets	673	169
Impairment and equity in net loss of unconsolidated affiliate		10,678
Changes in operating assets and liabilities:
Accounts receivable	(9,728)	(16,348)
Inventories	(4,118)	(4,537)
Accounts payable	3,024	6,659
Accrued expenses (including post-retirement)	(7,080)	(11,743)
Accrued payroll and severance	(1,198)	5,492
Accrued taxes	5,756	(2,167)
Prepaid expenses and other	(2,052)	1,294
Net cash provided by operating activities	103,831	85,811
Investing activities:
Purchases of property, plant, and equipment	(19,422)	(25,328)
Acquisition of businesses, net of cash acquired	(52,768)	(145,000)
Purchase of short-term investments		(8,478)
Proceeds from maturities of short-term investments	6,770
Proceeds from sale of assets	72	158
Net cash used in investing activities	(65,348)	(178,648)
FINANCING activities:
Proceeds from term loan		100,000
Proceeds from revolving credit facility	97,500	160,500
Payments of term loan	(3,750)
Payments of revolving credit facility	(37,000)	(116,000)
Debt issuance costs paid	(108)	(809)
Cash dividends paid	(15,543)	(13,789)
Purchases of common stock	(14,283)
Proceeds from exercise of stock options	12,170	19,335
Excess tax benefit on share-based compensation	2,477	3,763
Net cash provided by financing activities	41,463	153,000
Effect of exchange rate changes on cash and cash equivalents	(6,862)	(2,631)
Increase in cash and cash equivalents	73,084	57,532
Cash and cash equivalents at beginning of period	305,192	235,404
Cash and cash equivalents at end of period	$ 378,276	$ 292,936