Other Assets, Net - Schedule of Identified Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	$ 152,895	$ 15,971
Total accumulated amortization	26,428	12,908
Identified intangible assets, net	126,467	3,063
In-place leases
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	72,086	12,777
Total accumulated amortization	20,015	10,871
Above-market real estate leases
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	12,066	773
Total accumulated amortization	1,600	612
Below-market ground leases
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	2,547	2,215
Total accumulated amortization	1,365	1,278
Option to enter into ground lease
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	17,090	0
Total accumulated amortization	78	0
Management and leasing contracts
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	48,900	0
Total accumulated amortization	3,209	0
Other
Finite-Lived Intangible Assets [Line Items]
Total identified intangibles assets	206	206
Total accumulated amortization	$ 161	$ 147