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Business and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (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 $ 65,573 $ 53,159 $ 39,954
Accounts Written Off, net of Recoveries (232,566) (263,828) (214,755)
Accounts Receivable Provision 223,357 276,242 227,960
Ending Balance $ 56,364 $ 65,573 $ 53,159