Quarterly report pursuant to Section 13 or 15(d)

Legal Proceedings (Details)

v3.20.1
Legal Proceedings (Details) - Germany - Patent Infringement - AES
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 11, 2018
USD ($)
Mar. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lufthansa Technik AG        
Loss Contingencies [Line Items]        
Damages sought $ 6,200      
Recorded reserve       $ 1,000
Litigation settlement, amount awarded to other party, excluding interest     $ 3,200  
Litigation settlement, amount awarded to other party     4,500  
Loss contingency accrual     3,500  
Indirect Sales        
Loss Contingencies [Line Items]        
Recorded reserve   $ 4,700    
Interest rate accrued above bank rate until final payment   0.05    
Estimate of possible loss, excluding interest     11,600  
Gain (loss) related to litigation settlement   $ 16,200 $ 16,100  
Indirect Sales | Selling, General and Administrative Expenses        
Loss Contingencies [Line Items]        
Litigation settlement interest   $ 300