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Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II – Valuation and Qualifying Accounts The table below details the activity of the allowance for doubtful accounts and sales credits (1) for the years ended December 31, 2019, 2018, and 2017 (in thousands):
|  | Balance at Beginning of Year |  | Charged to Expense |  | Reductions |  | Balance at End of Year
Year ended December 31, 2017 |  | $ | 6,344 |  |  | $ | 5,690 |  |  | $ | 5,565 |  |  | $ | 6,469 |
Year ended December 31, 2018 |  | $ | 6,469 |  |  | $ | 6,542 |  |  | $ | 7,302 |  |  | $ | 5,709 |
Year ended December 31, 2019 |  | $ | 5,709 |  |  | $ | 10,978 |  |  | $ | 11,590 |  |  | $ | 5,097 |
__________________________ |  |  |  |  |  |  |  |
(1) | Additions to the allowance for doubtful accounts are charged to bad debt expense. Additions to the allowance for sales credits are charged against revenues.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: 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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