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Summary of Significant Accounting Policies - Accounts Receivable and Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Maximum amount available to be sold under agreement |  |  | $ 140,000 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 29,658 | $ 15,083 |  |
Charged to Costs and Expenses | (1,103) | 13,504 |  |
Write-Offs Net of Recoveries | (154) | (186) |  |
Ending Balance | 28,401 | 28,401 |  |
Prepaid Expense and Other Current Assets, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 7,359 | 0 |  |
Charged to Costs and Expenses | 9 | 7,368 |  |
Write-Offs Net of Recoveries | 0 | 0 |  |
Ending Balance | 7,368 | 7,368 |  |
Allowance for doubtful accounts receivable | $ 28,401 | $ 15,083 | $ 28,401 | $ 16,500

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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