Leases - Components of Fixed and Variable Lease Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Fixed lease revenues	$ 41,828	$ 31,968	$ 82,231	$ 61,929
Variable lease revenues	402	423	768	1,516
Total lease revenues	$ 42,230	$ 32,391	$ 82,999	$ 63,445