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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Line, Product Type, Geography and Revenue Recognition Method (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 154,610	$ 173,504	$ 466,597	$ 521,985
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	102,729	105,513	305,087	330,280
Capital
Disaggregation of Revenue [Line Items]
Revenues	51,881	67,991	161,510	191,705
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	137,679	151,101	403,568	457,093
Over Time
Disaggregation of Revenue [Line Items]
Revenues	16,931	22,403	63,029	64,892
North America
Disaggregation of Revenue [Line Items]
Revenues	87,366	92,041	269,907	291,584
Europe
Disaggregation of Revenue [Line Items]
Revenues	38,951	49,146	112,881	131,944
Asia
Disaggregation of Revenue [Line Items]
Revenues	18,847	20,971	50,992	61,745
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	$ 9,446	$ 11,346	$ 32,817	$ 36,712

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