Deferred Costs, Acquired Lease Intangibles and Goodwill - Schedule of Deferred Costs, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs [Line Items]
Leasing costs	$ 164,751	$ 140,325
Total deferred costs, gross amount	469,530	468,208
Less: accumulated amortization	(215,102)	(195,617)
Total deferred costs, net, excluding net deferred financing costs	254,428	272,591
Acquired in-place lease value and deferred leasing costs [Member]
Deferred Costs [Line Items]
Acquired finite-lived intangible assets, gross	237,364	253,113
Acquired above-market leases [Member]
Deferred Costs [Line Items]
Acquired finite-lived intangible assets, gross	$ 67,415	$ 74,770