EQUITY ROLL FORWARD (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 02, 2016
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	$ 615,088
Net income	15,934	$ 13,580
Adjustment to Impo redemption value	(148)
Dividends on common stock	(4,668)
Common stock issued	481
Common stock repurchased	(665)
Share-based compensation	2,941
Currency translation adjustment	8,410
Pension liability, net of tax	491
Equity, ending balance	637,808
Increase (Decrease) in Temporary Equity
Temporary equity, beginning balance	7,652
Net income	56
Adjustment to Impo redemption value	148
Currency translation adjustment	(7)
Temporary equity, ending balance	7,849
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	4,638
Common stock issued	2
Common stock repurchased	(2)
Share-based compensation	6
Equity, ending balance	4,644
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	228,564
Common stock issued	479
Share-based compensation	2,935
Equity, ending balance	231,978
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	550,095
Net income	15,730
Adjustment to Impo redemption value	(148)
Dividends on common stock	(4,668)
Common stock repurchased	(663)
Equity, ending balance	560,346
Minimum Pension Liability
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(51,568)
Pension liability, net of tax	491
Equity, ending balance	(51,077)
Cumulative Translation Adjustment
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(118,284)
Currency translation adjustment	8,396
Equity, ending balance	(109,888)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	1,643
Net income	148
Currency translation adjustment	14
Equity, ending balance	1,805
Total Equity
Increase (Decrease) in Stockholders' Equity
Net income	$ 15,878