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Restructuring Charges and Asset Impairments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve      
Balance at $ 12,006,000 $ 15,449,000  
Expenses, net 18,071,000 23,705,000  
Cash payments (20,014,000) (27,148,000) $ (52,730,000)
Balance at 10,063,000 12,006,000 15,449,000
Asset impairment charges 0 44,000,000 1,000,000
Restructuring charges and asset impairments 20,712,000 69,606,000 25,899,000
Non cash charges $ 3,000,000 2,000,000  
Minimum      
Restructuring Reserve      
Restructuring reserve, payment period 12 months    
Maximum      
Restructuring Reserve      
Restructuring reserve, payment period 24 months    
Severance and benefits costs      
Restructuring Reserve      
Balance at $ 11,937,000 13,641,000  
Expenses, net 16,399,000 22,794,000  
Cash payments (18,295,000) (24,498,000)  
Balance at 10,041,000 11,937,000 13,641,000
Other exit costs      
Restructuring Reserve      
Balance at 69,000 1,808,000  
Expenses, net 1,672,000 911,000  
Cash payments (1,719,000) (2,650,000)  
Balance at $ 22,000 $ 69,000 $ 1,808,000