Schedule III (Consolidated) - Real Estate and Accumulated Depreciation - Reconciliation of Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule III, Reconciliation of real estate owned
Balance at beginning of the year	$ 505,032	$ 418,494	$ 404,376
Amounts capitalized	167,258	109,699	43,306
Impairments			(99)
Cost of real estate sold	(33,324)	(23,608)	(18,347)
Amounts retired or adjusted	(11,353)	447	(10,742)
Balance at the end of the year	$ 627,613	$ 505,032	$ 418,494