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Commitments and Contingencies - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2017 USD ($) ground_lease extension | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 16, 2016 shares
Jesse Small v. Monty J. Bennett, et al., Case No. 24-C-16006020 (Md. Cir. Ct. [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Alleged corporate waste (in shares) | shares |  |  |  | 175,000
Management Fees [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Portion of project management fees to project costs | 4.00% |  |  |
Leases [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of ground leases under operating leases | ground_lease | 3 |  |  |
Number of extension options | extension | 2 |  |  |
Term of lease extension option | 25 years |  |  |
Lease rent expense | $ 5,900,000 | $ 5,700,000 | $ 4,700,000 |
Lease rent expense, contingent rent | 2,200,000 | $ 2,000,000 | $ 1,800,000 |
Capital Commitments [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Capital commitment related to general capital improvement | $ 22,300,000 |  |  |
Period of capital commitment related to general capital improvement | 12 months |  |  |
Minimum [Member] | Management Fees [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Monthly minimum property management fee | $ 13,000 |  |  |
Property management fee | 3.00% |  |  |
Minimum [Member] | Restricted Cash [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Escrow reserve for capital improvements as percentage of gross revenues, minimum | 4.00% |  |  |
Minimum [Member] | Management Fees [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Property management fee | 2.00% |  |  |
Maximum [Member] | Restricted Cash [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Escrow reserve for capital improvements as percentage of gross revenues, minimum | 5.00% |  |  |
Maximum [Member] | Management Fees [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Property management fee | 7.00% |  |  |

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