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Restructuring and Impairment Charges (Schedule Of Restructuring Reserve Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Accrued $ 1,847 $ 1,006
Cash Charges 6,438 563
Non-cash charges 212 318
Cash payments (5,972) (1,460)
Accrued 2,256 109
Impairment And Loss On Disposal Of Machinery And Equipment [Member]    
Restructuring Cost and Reserve [Line Items]    
Non-cash charges 269  
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 1,596 647
Cash Charges   (4)
Non-cash charges (57)  
Cash payments (1,075) (612)
Accrued 464 31
Other Charges Related To Facility Closure [Member]    
Restructuring Cost and Reserve [Line Items]    
Accrued 251 359
Cash Charges 6,438 567
Non-cash charges   (120)
Cash payments (4,897) (848)
Accrued $ 1,792 $ 78