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Significant Accounting Policies - Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Prior to Adoption of ASC 326 [Roll Forward] |  |  |  |
Allowance for credit losses, beginning of period |  | $ 29,387 |  | $ 28,457
Additions charged to expense |  | 11,462 |  | 23,782
Adjustment to value of acquired receivables |  | 2,207 |  | 2,207
Write-offs, net of recoveries |  | (12,323) |  | (23,713)
Allowance for credit losses, end of period |  | $ 30,733 |  | $ 30,733
After Adoption of ASC 326 [Roll Forward] |  |  |  |
Allowance for credit losses, beginning of period | $ 38,094 |  | $ 30,931 |
Additions charged to expense | 11,976 |  | 23,147 |
Adjustment to value of acquired receivables | 0 |  | 0 |
Write-offs, net of recoveries | (7,114) |  | (15,693) |
Allowance for credit losses, end of period | 42,956 |  | 42,956 |
Cumulative Effect Period of Adoption Adjustment |  |  |  |
After Adoption of ASC 326 [Roll Forward] |  |  |  |
Allowance for credit losses, beginning of period | $ 0 |  | $ 4,571 |

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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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