Summary of Significant Accounting Policies - Revenue Recognition and Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Straight line rent adjustments	$ (10,719)	$ 12,509	$ 12,378
Straight line rent receivable	$ 1,897	3,073
Number of reportable segments | segment	2
Affiliated Entity
Related Party Transaction [Line Items]
Straight line rent receivables, due from related parties	$ 47,057	66,347
Deferred percentage rental income	$ 4,238	$ 3,695	$ 2,106