SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Real Estate
Balance at at beginning	$ 477,963	$ 463,732	$ 1,165,662
Additions	21,223	92,964	175,996
Deductions	(39,385)	(78,733)	(877,926)
Balance at ending	459,801	477,963	463,732
Reconciliation of Accumulated Depreciation
Balance at at beginning	90,173	79,228	177,546
Additions	12,188	13,379	22,761
Deductions	(19,943)	(2,434)	(121,079)
Balance at ending	$ 82,418	$ 90,173	$ 79,228