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Allowance for Expected Credit Losses (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Contract assets, allowance for credit loss as a percentage of assets 1.00%      
Trade receivables        
Beginning balance $ 75,966 $ 76,061 $ 75,176 $ 53,412
Charges to cost and expenses, net of recoveries 4,234 11,300    
Write-offs (2,015)      
Currency effects and other, net (1,429) 4,379    
Ending balance 75,966 76,061    
Contract assets        
Beginning balance 3,205 206    
Charges to cost and expenses, net of recoveries 0 0    
Write-offs 0      
Currency effects and other, net (427) 58    
Ending balance 2,778 3,043    
Long-term Receivables        
Beginning balance 67,842 68,555    
Currency effects and other, net (145) (730)    
Ending balance 67,697 67,146    
ASU No. 2016-13 - Measurement of Credit Losses on Financial Instruments (Topic 326)        
Trade receivables        
Beginning balance       $ 6,970
Contract assets        
Beginning balance   2,779    
Long-term Receivables        
Beginning balance $ 0 $ (679)