Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Operating activities
Net income	$ 88,784	$ 75,332	$ 87,024
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	25,201	25,344	25,641
Amortization of intangibles	9,279	6,089	6,611
Impairment of assets		549	2,320
Provision for bad debts	289	242	444
Non-cash inventory charge	1,525	567	4,145
Pension settlement losses		5,348
Impairment and equity in net loss of unconsolidated affiliate	10,678	7,334
Loss (gain) on sale of property, plant and equipment	92	(1,443)	183
Stock-based compensation	8,609	7,348	5,805
Excess tax benefit on share-based compensation	(4,054)	(2,728)	(4,220)
Deferred income taxes	6,640	(2,661)	(1,363)
Changes in operating assets and liabilities:
Accounts receivable	(16,683)	(1,587)	4,768
Inventories	(5,486)	5,439	2,612
Accounts payable	2,000	5,353	(5,272)
Accrued expenses (including post-retirement)	(8,906)	(9,570)	(421)
Accrued payroll and severance	8,032	(4,387)	(3,226)
Accrued taxes	(10,773)	(357)	(6,057)
Prepaid expenses and other	2,140	(42)	1,756
Net cash provided by operating activities	117,367	116,170	120,750
Investing activities
Acquisitions of businesses, net of cash acquired	(144,382)	(34,016)	(11,077)
Purchases of short-term investments	(8,478)	(4,616)	(14,228)
Proceeds from maturities of short-term investments	2,044	17,805
Investments in unconsolidated affiliate		(10,000)	(6,000)
Loan to unconsolidated affiliate		(2,000)
Purchases of property, plant and equipment	(34,953)	(22,529)	(17,555)
Proceeds from sale of property, plant and equipment	176	3,664	217
Net cash used in investing activities	(185,593)	(51,692)	(48,643)
Financing activities
Proceeds from debt	260,500	23,251	110,000
Payments of term debt	(1,250)		(49,000)
Payments of revolving credit facility	(123,500)	(25,032)	(50,000)
Proceeds from exercise of stock options	21,959	16,367	23,036
Debt issuance costs	(809)		(716)
Cash dividends paid	(18,722)	(16,564)	(14,508)
Excess tax benefit on share-based compensation	4,054	2,728	4,220
Purchases of common stock			(37,092)
Net cash provided by (used in) financing activities	142,232	750	(14,060)
Effect of exchange rate changes on cash and cash equivalents	(4,218)	6,160	(3,751)
Increase in cash and cash equivalents	69,788	71,388	54,296
Cash and cash equivalents at beginning of year	235,404	164,016	109,720
Cash and cash equivalents at end of year	$ 305,192	$ 235,404	$ 164,016