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Basis of Presentation and Summary of Significant Accounting Policies Leases, Impact of New Accounting Standard Adoption (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Leases, Initial Application Period Cumulative Effect Transition [Line Items]    
Prepaid expenses and other current assets $ 198,967 $ 210,212
Intangible assets, net 5,649,464 5,906,690
Other assets 403,902 363,587
Accrued expenses and other current liabilities 625,967 584,151
Other liabilities $ 392,250 $ 510,663