Quarterly report pursuant to Section 13 or 15(d)

Legal Proceedings (Details)

v3.20.2
Legal Proceedings (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 11, 2018
USD ($)
Jun. 29, 2019
USD ($)
Jun. 27, 2020
USD ($)
Jun. 29, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]            
Non-cash Litigation Provision     $ (1,450) $ 0    
Germany | Lufthansa Technik AG | Patent Infringement | AES            
Loss Contingencies [Line Items]            
Damages sought $ 6,200          
Litigation settlement, amount awarded to other party, excluding interest         $ 3,200  
Litigation settlement, amount awarded to other party   $ 4,700        
Loss contingency accrual         4,500 $ 1,000
Loss contingency accrual, incremental reserve         3,500  
Germany | Indirect Sales | Patent Infringement | AES            
Loss Contingencies [Line Items]            
Interest rate accrued above bank rate until final payment     0.05      
Estimate of possible loss, excluding interest         11,600  
Non-cash Litigation Provision     $ 16,400   $ 16,100  
Germany | Indirect Sales | Patent Infringement | AES | Selling, General and Administrative            
Loss Contingencies [Line Items]            
Litigation settlement interest     300      
UNITED KINGDOM | Lufthansa Technik AG | Patent Infringement            
Loss Contingencies [Line Items]            
Loss contingency accrual     $ 1,500