Acquired Lease Intangibles - Amortization of Intangible Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of below market lease	$ 1,119	$ 2,261	$ 1,754
Above-market lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	300	875	753
Below-market operating ground lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	54	53	53
Below-market finance ground lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	159	102	0
In-place lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 6,935	$ 14,971	$ 7,676