Deferred Costs and Other Intangibles, Net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to deferred leasing costs, in-place leases, trademark and database	$ 2,100	$ 6,900	$ 7,200	$ 26,700
Noncash amortization of deferred financing costs			6,285	7,912
Revolving Credit Facility | Line of Credit
Finite-Lived Intangible Assets [Line Items]
Noncash amortization of deferred financing costs	$ 500	$ 500	$ 1,300	$ 1,900