Deferred Costs and Other Intangibles, Net - Components of Deferred Costs and Intangibles (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Acquired Indefinite-lived Intangible Assets
Deferred leasing costs	$ 7,521	$ 11,912
Deferred financing costs	11,245	11,246
Intangible assets:
Intangible assets	20,866	25,258
Less: accumulated amortization	(11,880)	(12,572)
Total	8,986	12,686
Database
Intangible assets:
Intangible assets	$ 2,100	$ 2,100