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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II—Valuation and Qualifying Accounts | Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries Schedule II—Valuation and Qualifying Accounts Years Ended December 31, 2017, 2016 and 2015 (in thousands)
|  | Balance at Beginning of Year |  | Charged to Costs and Expenses (1) |  | Charged to Other Accounts (2) |  | Deductions (3) |  | Balance at End of Year
Accounts Receivables-Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 603 |  |  | $ | 368 |  |  | $ | (36 | ) |  | $ | (328 | ) |  | $ | 607 |
Year ended December 31, 2016 |  | $ | 1,525 |  |  | $ | (17 | ) |  | $ | 235 |  |  | $ | (1,140 | ) |  | $ | 603 |
Year ended December 31, 2015 |  | $ | 717 |  |  | $ | 1,125 |  |  | $ | 98 |  |  | $ | (415 | ) |  | $ | 1,525 |
Allowance for Deferred Rent Receivable |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 373 |  |  | $ | (9 | ) |  | $ | — |  |  | $ | — |  |  | $ | 364 |
Year ended December 31, 2016 |  | $ | 1,962 |  |  | $ | (1,589 | ) |  | $ | — |  |  | $ | — |  |  | $ | 373 |
Year ended December 31, 2015 |  | $ | 1,418 |  |  | $ | — |  |  | $ | 544 |  |  | $ | — |  |  | $ | 1,962 |
Allowance for Deferred Tax Asset |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 2,062 |  |  | $ | (646 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,416 |
Year ended December 31, 2016 |  | $ | 2,062 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,062 |
Year ended December 31, 2015 |  | $ | 2,062 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,062 |
(1) Amounts charged to costs and expenses are net of recoveries. Reduction in allowance for deferred tax asset was the result of a decrease in the corporate tax rate. (2) Allowances for certain accounts receivables were charged to service company revenue. Deferred rent receivable allowances were charged to rental revenue. (3) Deductions reflect adjustments to reserves due to actual write-offs of accounts.

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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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