Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	$ 204,560	$ 213,391
Accumulated impairment losses	(85,509)	(85,509)
Net Balance, Beginning Balance	119,051	127,882
Increase Due to Acquisition	38,552
Currency Translation	(6,148)	(8,831)
Goodwill period adjustments	32,404	(8,831)
Gross Balance, Ending Balance	236,964	204,560
Accumulated impairment losses	(85,509)	(85,509)
Net Balance, Ending Balance	151,455	119,051
Stock-Preparation
Goodwill [Roll Forward]
Net Balance, Beginning Balance	19,527
Net Balance, Ending Balance	54,751	19,527
Doctoring, Cleaning, & Filtration
Goodwill [Roll Forward]
Net Balance, Beginning Balance	35,990
Net Balance, Ending Balance	33,839	35,990
Fluid-Handling
Goodwill [Roll Forward]
Net Balance, Beginning Balance	46,694
Net Balance, Ending Balance	45,600	46,694
Operating Segments | Papermaking systems segment
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	187,720	193,279
Accumulated impairment losses	(85,509)	(85,509)
Net Balance, Beginning Balance	102,211	107,770
Increase Due to Acquisition	38,552
Currency Translation	(6,573)	(5,559)
Goodwill period adjustments	31,979	(5,559)
Gross Balance, Ending Balance	219,699	187,720
Accumulated impairment losses	(85,509)	(85,509)
Net Balance, Ending Balance	134,190	102,211
Operating Segments | Wood Processing Systems
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	16,840	20,112
Accumulated impairment losses	0	0
Net Balance, Beginning Balance	16,840	20,112
Increase Due to Acquisition	0
Currency Translation	425	(3,272)
Goodwill period adjustments	425	(3,272)
Gross Balance, Ending Balance	17,265	16,840
Accumulated impairment losses	0	0
Net Balance, Ending Balance	$ 17,265	$ 16,840