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Schedule II Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2017
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 |  | Other |  | of year |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  | $ | 325 |  | $ | (106) |  | $ | (89) |  | $ | — |  |  | 130 |
2016 |  |  | 130 |  |  | 78 |  |  | (108) |  |  | — |  |  | 100 |
2017 |  |  | 100 |  |  | 178 |  |  | (28) |  |  | — |  |  | 250 |
Straight-line rent allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  | $ | 162 |  | $ | (112) |  | $ | — |  | $ | — |  |  | 50 |
2016 |  |  | 50 |  |  | — |  |  | — |  |  | — |  |  | 50 |
2017 |  |  | 50 |  |  | — |  |  | — |  |  | — |  |  | 50 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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