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REAL ESTATE AND ACCUMULATED DEPRECIATION - Rollforward (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment in Real Estate:        
Beginning balance $ 4,798,605 $ 4,546,384 $ 4,663,153 $ 4,798,605
Additions   206,737 125,244 40,789
Impairment/write-offs   (194,343) (195,736) (151,753)
Sales/disposals   (292,268) (46,277) (24,488)
Assets held for sale 0 (21,246) 0  
Ending balance   4,245,264 4,546,384 4,663,153
Accumulated Depreciation:        
Beginning balance 1,371,623 1,428,053 1,432,443 1,371,623
Depreciation expense   188,021 201,926 219,112
Impairment/write-offs   (194,343) (195,736) (151,753)
Sales/disposals   (119,102) (10,580) (6,539)
Assets held for sale $ 0 (9,297) 0  
Ending balance   1,293,332 1,428,053 1,432,443
Investment in Real Estate, net   $ 2,951,932 $ 3,118,331 $ 3,230,710