Schedule III Real Estate Investments and Accumulated Depreciation - Summary of Activity for Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	$ 2,154,194	$ 1,845,776
Acquisition of properties	100,391	289,591
Disposition of properties	(53,978)	(41,560)
Construction in progress	7,029	28,154
Improvements, net of write-offs	23,592	32,233
Balance at end of year	$ 2,231,228	$ 2,154,194