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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 229 | $ 259 | $ 436
(Release) Provision for Bad Debts | (79) | 142 | 47
Net Write-offs | (94) | (172) | (224)
Balance at End of Year | 56 | 229 | 259
Refund Reserve |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 396 | 282 | 487
(Release) Provision for Bad Debts | 24,987 | 21,240 | 22,446
Net Write-offs | (24,829) | (21,126) | (22,651)
Balance at End of Year | $ 554 | $ 396 | $ 282

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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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