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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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 152,860	$ 177,165	$ 311,987	$ 348,481
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	97,261	111,917	202,358	224,767
Capital
Disaggregation of Revenue [Line Items]
Revenues	55,599	65,248	109,629	123,714
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	129,797	157,716	265,889	305,992
Over Time
Disaggregation of Revenue [Line Items]
Revenues	23,063	19,449	46,098	42,489
North America
Disaggregation of Revenue [Line Items]
Revenues	88,718	98,667	182,541	199,543
Europe
Disaggregation of Revenue [Line Items]
Revenues	37,916	43,813	73,930	82,798
Asia
Disaggregation of Revenue [Line Items]
Revenues	16,237	23,696	32,145	40,774
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	$ 9,989	$ 10,989	$ 23,371	$ 25,366

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