Schedule III - Real Estate Assets and Accumulated Depreciation - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate:
Balance at the beginning of the period	$ 1,683,205	$ 1,605,081	$ 1,368,157
Acquisitions	190,133	84,630	318,070
Improvements	4,521	7,223	3,103
Impairment	0	0	(21,465)
Sales of real estate	(4,053)	(13,729)	(62,784)
Balance at the end of the period	1,873,806	1,683,205	1,605,081
Accumulated depreciation:
Balance at the beginning of the period	(259,803)	(220,359)	(185,926)
Depreciation expense	(45,498)	(41,914)	(40,373)
Impairment	0	0	5,220
Sales of real estate	516	2,470	720
Balance at the end of the period	$ (304,785)	$ (259,803)	$ (220,359)