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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts and Credit Memo Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]      
The general period to charge-off uncollectible balances of receivable, as circumstances warrant, is no later than this period of time past due 1 year    
SEC Schedule, 12-09, Allowance, Credit Loss      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of the Year $ 43,584 $ 46,648 $ 44,290
Credit Memos Charged to Revenue 51,846 36,329 38,966
Allowance for Bad Debts Charged to Expense 19,389 18,625 14,826
Deductions and Other (71,963) (58,018) (51,434)
Balance at End of the Year $ 42,856 $ 43,584 $ 46,648