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Intangible Assets (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 27, 2020
Jun. 28, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
May 26, 2020
Dec. 31, 2019
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value $ 73,675,000     $ 73,675,000     $ 93,474,000
Accumulated Amortization 57,193,000     57,193,000     53,984,000
Net Carrying Value 16,482,000     16,482,000     39,490,000
Intangible asset impairment charges 0 $ 19,571,000 $ 0 19,571,000 $ 0    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 16,482,000     16,482,000     39,490,000
Distribution networks              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 38,060,000     38,060,000     38,060,000
Accumulated Amortization 38,060,000     38,060,000     38,060,000
Net Carrying Value 0     0     0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 0     0     0
Completed technologies              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 21,917,000     21,917,000     31,987,000
Accumulated Amortization 11,678,000     11,678,000     9,160,000
Net Carrying Value 10,239,000     10,239,000     22,827,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 10,239,000     10,239,000     22,827,000
Completed technologies | Sualab [Member]              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Intangible asset impairment charges   10,070,000          
Customer relationships              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 10,578,000     10,578,000     14,407,000
Accumulated Amortization 6,980,000     6,980,000     6,402,000
Net Carrying Value 3,598,000     3,598,000     8,005,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 3,598,000     3,598,000     8,005,000
Customer relationships | Sualab [Member]              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Intangible asset impairment charges   3,382,000          
Customer relationships | EnShape GmbH [Member]              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Accumulated Amortization           $ 228,000  
Intangible asset impairment charges   219,000          
Intangible assets acquired   0       $ 447,000  
In-process technologies              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 2,300,000     2,300,000     8,200,000
Accumulated Amortization 0     0     0
Net Carrying Value 2,300,000     2,300,000     8,200,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 2,300,000     2,300,000     8,200,000
In-process technologies | Sualab [Member]              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Intangible asset impairment charges   $ 5,900,000          
Non-compete agreements              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 710,000     710,000     710,000
Accumulated Amortization 422,000     422,000     350,000
Net Carrying Value 288,000     288,000     360,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 288,000     288,000     360,000
Trademarks              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Gross Carrying Value 110,000     110,000     110,000
Accumulated Amortization 53,000     53,000     12,000
Net Carrying Value 57,000     57,000     98,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Net Carrying Value 57,000     57,000     $ 98,000
Indefinite-lived intangible asset excluding in-process technologies              
Distribution Rights, Developed Technology Rights, Customer Contracts And Relationships, Other Intangible Assets, And Trademarks              
Net Carrying Value 14,182,000     14,182,000      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]              
Remainder of fiscal 2020 831,000     831,000      
2021 3,272,000     3,272,000      
2022 2,902,000     2,902,000      
2023 2,211,000     2,211,000      
2024 1,697,000     1,697,000      
2025 1,374,000     1,374,000      
Thereafter 1,895,000     1,895,000      
Net Carrying Value $ 14,182,000     $ 14,182,000