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Schedule II Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2021
Schedule II Valuation and qualifying accounts: |
Schedule II Valuation and qualifying accounts: | ​ ​ Schedule II ​ Franklin Street Properties Corp. Valuation and qualifying accounts: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Additions |  |  | ​ |  |  | ​ |
​ | ​ | ​ | ​ | ​ | (Decreases) | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Balance at | ​ | charged to | ​ | ​ | ​ | ​ | Balance |
(in thousands) | ​ | beginning | ​ | costs and | ​ | ​ | ​ | ​ | at end |
Classification | ​ | of year | ​ | expenses | ​ | Deductions | ​ | of year |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ | $ | 200 | ​ | $ | 213 | ​ | $ | (113) | ​ | $ | 300 | ​
2020 | ​ |  | 300 | ​ |  | 340 | ​ |  | (135) | ​ |  | 505 | ​
2021 | ​ |  | 505 | ​ |  | 157 | ​ |  | (129) | ​ |  | 533 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Straight-line rent allowance for doubtful accounts | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ | $ | 50 | ​ | $ | — | ​ | $ | — | ​ | $ | 50 | ​
2020 | ​ |  | 50 | ​ |  | — | ​ |  | (50) | ​ |  | — | ​
2021 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
​

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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=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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