Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 3,200	$ 1,200
Other intangible assets			$ 7,761
Below market ground leases			$ 118,050
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	2,586
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2,586
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,586
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,586
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 2,586
Finite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	27 years
Finite-Lived Intangible Assets, Gross	$ 49,708	119,411
Finite-Lived Intangible Assets, Accumulated Amortization	(3,447)	(1,241)
Finite-Lived Intangible Assets, Net	46,260	118,170
Below market ground leases
Finite-Lived Intangible Assets [Line Items]
Below Market Lease, Net	$ 46,260	116,873
Finite-Lived Intangible Assets, Remaining Amortization Period	27 years
Below Market Lease, Accumulated Amortization	$ (3,447)	(1,176)
Below market ground leases	$ 49,708	118,050
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period
Other intangible assets	$ 0	1,361
Finite-Lived Intangible Assets, Accumulated Amortization	0	(65)
Other Intangible Assets, Net	$ 0	$ 1,297