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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts and Credit Memo Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 46,648 | $ 44,290 | $ 31,447
Credit Memos Charged to Revenue | 36,329 | 38,966 | 37,616
Allowance for Bad Debts Charged to Expense | 18,625 | 14,826 | 8,705
Other | (1,568) | 1,905 | 16,528
Deductions | (56,450) | (53,339) | (50,006)
Balance at End of the Year | $ 43,584 | $ 46,648 | $ 44,290

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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