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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 | Financial Statement Schedules Schedule II-Valuation and Qualifying Accounts (in thousands):
| Years Ended December 31, 2019, 2018, and 2017
| Balance at Beginning of Year |  | (Release) Provision for Bad Debts |  | Net Write-offs |  | Balance at End of Year
Allowance for doubtful accounts |  |  |  |  |  |  |
2019 | $ | 229 |  |  | $ | (79 | ) |  | $ | (94 | ) |  | $ | 56 |
2018 | 259 |  |  | 142 |  |  | (172 | ) |  | 229 |
2017 | 436 |  |  | 47 |  |  | (224 | ) |  | 259 |
| Years Ended December 31, 2019, 2018, and 2017
| Balance at Beginning of Year |  | Provision for Refunds |  | Refunds Issued |  | Balance at End of Year
Refund Reserve |  |  |  |  |  |  |
2019 | $ | 396 |  |  | $ | 24,987 |  |  | $ | (24,829 | ) |  | $ | 554 |
2018 | 282 |  |  | 21,240 |  |  | (21,126 | ) |  | 396 |
2017 | 487 |  |  | 22,446 |  |  | (22,651 | ) |  | 282 |
All other financial statement schedules are omitted because they are not applicable or the information is included in the Registrant’s consolidated financial statements or related notes.

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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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