CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest
Balance at Jan. 03, 2015		$ 4,759	$ 207,446	$ 492,548	$ (107,913)	$ 2,143
Balance (in shares) at Jan. 03, 2015		47,594,000
Increase (Decrease) in Stockholders' Equity
Net income				72,945		591
Currency translation adjustment					(58,261)	(146)
Minimum pension liability adjustment, net of tax expense/(benefit) of $534, $499, and ($2,471) for 2017, 2016, and 2015, respectively					4,566
Adjustments to Impo redemption value				(760)
Dividends on common stock ($0.4225, $0.3975, and $0.3825 per share for the years of 2017, 2016, and 2015, respectively)				(18,103)
Noncontrolling dividend						(823)
Common stock issued		$ 11	2,039
Common stock issued (in shares)		108,000
Share-based compensation		$ 15	5,611
Share-based compensation (in shares)		151,000
Common stock repurchased	$ (46,300)	$ (163)		(48,416)
Common stock repurchased (in shares)	(1,568,731)	(1,634,000)
Tax benefit of stock options exercised			1,376
Balance at Jan. 02, 2016		$ 4,622	216,472	498,214	(161,608)	1,765
Balance (in shares) at Jan. 02, 2016		46,219,000
Temporary equity, beginning balance at Jan. 03, 2015	$ 6,420
Increase (Decrease) in Redeemable Noncontrolling Interest
Net income	155
Currency translation adjustment	(479)
Adjustments to Impo redemption value	760
Temporary equity, ending balance at Jan. 02, 2016	6,856
Increase (Decrease) in Stockholders' Equity
Net income				78,745		577
Currency translation adjustment					(8,234)	(26)
Minimum pension liability adjustment, net of tax expense/(benefit) of $534, $499, and ($2,471) for 2017, 2016, and 2015, respectively					(10)
Adjustments to Impo redemption value				(1,002)
Dividends on common stock ($0.4225, $0.3975, and $0.3825 per share for the years of 2017, 2016, and 2015, respectively)				(18,464)
Noncontrolling dividend						(673)
Common stock issued		$ 27	5,216
Common stock issued (in shares)		274,000
Share-based compensation		$ 13	6,876
Share-based compensation (in shares)		125,000
Common stock repurchased	$ (3,800)	$ (24)		(7,398)
Common stock repurchased (in shares)	(144,600)	(242,000)
Balance at Dec. 31, 2016	$ 615,088	$ 4,638	228,564	550,095	(169,852)	1,643
Balance (in shares) at Dec. 31, 2016	46,376,000	46,376,000
Increase (Decrease) in Redeemable Noncontrolling Interest
Net income	$ (7)
Currency translation adjustment	(199)
Adjustments to Impo redemption value	1,002
Temporary equity, ending balance at Dec. 31, 2016	7,652
Increase (Decrease) in Stockholders' Equity
Net income				78,180		661
Currency translation adjustment					18,601	164
Minimum pension liability adjustment, net of tax expense/(benefit) of $534, $499, and ($2,471) for 2017, 2016, and 2015, respectively					2,204
Adjustments to Impo redemption value				27
Dividends on common stock ($0.4225, $0.3975, and $0.3825 per share for the years of 2017, 2016, and 2015, respectively)				(19,785)
Noncontrolling dividend						(504)
Common stock issued		$ 25	4,472
Common stock issued (in shares)		256,000
Share-based compensation		$ 9	7,100
Share-based compensation (in shares)		86,000
Common stock repurchased	$ 0	$ (9)		(3,612)
Common stock repurchased (in shares)	0	(88,000)
Balance at Dec. 31, 2017	$ 702,621	$ 4,663	$ 240,136	$ 604,905	$ (149,047)	$ 1,964
Balance (in shares) at Dec. 31, 2017	46,630,000	46,630,000
Increase (Decrease) in Redeemable Noncontrolling Interest
Net income	$ (248)
Currency translation adjustment	(828)
Adjustments to Impo redemption value	(27)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(5,047)
Temporary equity, ending balance at Dec. 31, 2017	$ 1,502