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Basis of Presentation and Summary of Significant Accounting Policies - Impact of New Accounting Standard on Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Prepaid expenses and other current assets $ 198,967 $ 210,212
Other assets 403,902 363,587
Liabilities    
Deferred tax liabilities 935,989 990,899
Stockholders' equity    
Accumulated deficit $ (3,724,139) $ (3,491,069)