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Allowance for Expected Credit Losses (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]          
Decrease to retained earnings $ (3,677,117) $ (3,610,470) $ (3,670,543) $ (3,640,227)  
Contract assets, allowance for credit loss as a percentage of assets 1.00%        
Trade receivables          
Beginning balance $ 74,782 72,084 $ 75,176   $ 53,412
Charges to cost and expenses, net of recoveries 865 11,800      
Write-offs (2,015)        
Currency effects and other, net 756 (98)      
Ending balance 74,782 72,084      
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 (167) 25      
Ending balance 3,038 3,010      
Long-term Receivables          
Beginning balance 67,842 68,555      
Currency effects and other, net (72) (617)      
Ending balance 67,770 67,259      
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)