Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Assets.
Deferred rent receivable	$ 38,831	$ 38,335
Initial direct costs	28,591	26,371
Internal-use software	16,699	16,747
Prepaid expense	12,178	7,675
Corporate furniture, fixtures and equipment	4,507	4,848
Deferred financing costs - revolving credit facility	3,076	3,148
Other	673	3,958
Total	$ 104,555	$ 101,082