Deferred Costs and Other Intangibles, Net - Components of Deferred Costs and Intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired Indefinite-lived Intangible Assets
Deferred leasing costs	$ 12,831	$ 7,470
Deferred financing costs	11,244	6,552
Intangible assets:
Intangible assets	33,898	23,961
Less: accumulated amortization	(20,382)	(12,005)
Total	13,516	11,956
Value of in-place leases
Intangible assets:
Intangible assets	4,623	4,739
Trademark
Intangible assets:
Intangible assets	3,100	3,100
Database
Intangible assets:
Intangible assets	$ 2,100	$ 2,100