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Restructuring and Impairment Charges (Schedule Of Restructuring Reserve Activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]    
Accrued $ 1,006  
Cash Charges 794  
Non-cash charges 352 $ 1,319
Cash payments (1,733)  
Accrued 67  
Impairment Charges For Leasehold Improvements And Equipment [Member]    
Restructuring Cost and Reserve [Line Items]    
Non-cash charges   $ 1,319
Loss On Disposal Of Machinery And Equipment [Member]    
Restructuring Cost and Reserve [Line Items]    
Non-cash charges 438  
Employee Severance And Retention [Member]    
Restructuring Cost and Reserve [Line Items]    
Accrued 647  
Cash Charges (4)  
Cash payments (636)  
Accrued 7  
Other Charges Related To Facility Closure [Member]    
Restructuring Cost and Reserve [Line Items]    
Accrued 359  
Cash Charges 798  
Non-cash charges (86)  
Cash payments (1,097)  
Accrued $ 60