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Commitments and Contingencies - Narrative (Details)	12 Months Ended
	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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