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Business and Summary of Significant Accounting Policies - Accounts Receivable Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Bad Debt Expense $ 86 $ 1,337 $ 227,960
Provision for Returns and Uncollected Renewal Payments 223,271 274,905 0
Accounts Receivable Provision $ 223,357 $ 276,242 $ 227,960