EQUITY ROLL FORWARD (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			$ 598,216
Net income	22,805	25,297	67,684	69,351
Adjustment to Impo redemption value	(400)	0	(600)	0
Equity, ending balance	635,855		635,855
Increase (Decrease) in Temporary Equity
Temporary equity, beginning balance			5,171
Net income			455
Adjustment to Impo redemption value			621
Acquisitions			3,078
Purchase of redeemable noncontrolling shares			(2,875)
Currency translation adjustment			(189)
Temporary equity, ending balance	6,261		6,261
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			4,771
Common stock issued			8
Common stock repurchased or received for stock options exercised			(23)
Share-based compensation			0
Equity, ending balance	4,756		4,756
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			194,810
Common stock issued			1,343
Share-based compensation			6,314
Tax benefit of stock options exercised			1,590
Equity, ending balance	204,057		204,057
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			450,855
Net income			66,704
Adjustment to Impo redemption value			(621)
Dividends on common stock			(12,319)
Common stock repurchased or received for stock options exercised			(8,619)
Equity, ending balance	496,000		496,000
Minimum Pension Liability
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			(38,707)
Pension liability, net of tax			1,460
Equity, ending balance	(37,247)		(37,247)
Cumulative Translation Adjustment
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			(16,022)
Currency translation adjustment			(17,779)
Equity, ending balance	(33,801)		(33,801)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			2,509
Net income			525
Noncontrolling dividend			(800)
Currency translation adjustment			(144)
Equity, ending balance	2,090		2,090
Total Equity
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			598,216
Net income			67,229
Adjustment to Impo redemption value			(621)
Dividends on common stock			(12,319)
Common stock issued			1,351
Common stock repurchased or received for stock options exercised			(8,642)
Share-based compensation			6,314
Tax benefit of stock options exercised			1,590
Noncontrolling dividend			(800)
Currency translation adjustment			(17,923)
Pension liability, net of tax			1,460
Equity, ending balance	$ 635,855		$ 635,855