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Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 57,730    
Provision for expected credit losses 65,710 $ 20,563 $ 7,749
Write-offs (35,630)    
Other (110)    
Ending balance 97,568 57,730  
Adjustment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 9,868    
Ending balance   $ 9,868