Business Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Oct. 03, 2015 USD ($) Segment	Sep. 27, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment			2
Revenues:
Revenues	$ 91,929	$ 98,719	$ 282,507	$ 296,921
Income from Continuing Operations Before Provision for Income Taxes:
Total operating income	12,681	10,151	35,695	29,808
Interest expense, net	(185)	(168)	(551)	(420)
Income from Continuing Operations Before Provision for Income Taxes	12,496	9,983	35,144	29,388
Capital Expenditures:
Capital expenditures	1,417	1,703	4,068	3,145
Fiber-Based Products [Member]
Revenues:
Revenues	2,021	1,870	8,528	8,803
Operating Segment [Member] | Papermaking Systems [Member]
Revenues:
Revenues	80,789	88,369	248,069	258,528
Income from Continuing Operations Before Provision for Income Taxes:
Total operating income	14,246	13,006	41,559	36,219
Capital Expenditures:
Capital expenditures	1,258	1,325	3,412	2,614
Operating Segment [Member] | Wood Processing Systems [Member]
Revenues:
Revenues	9,119	8,480	25,910	29,590
Income from Continuing Operations Before Provision for Income Taxes:
Total operating income	2,724	1,648	7,512	4,497
Corporate and Fiber-Based Products [Member]
Income from Continuing Operations Before Provision for Income Taxes:
Total operating income	(4,289)	(4,503)	(13,376)	(10,908)
Other [Member]
Capital Expenditures:
Capital expenditures	$ 159	$ 378	$ 656	$ 531