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QUARTERLY RESULTS OF CONSOLIDATED OPERATIONS (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Selected Quarterly Financial Information [Abstract]                          
Total revenue $ 45,540 $ 44,138 $ 43,910 $ 44,406 $ 45,777 $ 47,436 $ 46,934 $ 45,608 $ 121,871 $ 177,994 $ 185,755 $ 121,871 $ 169,745
Net income (loss) attributable to controlling interests (4,378) 19,629 (3,803) (7,007) 48,658 31,596 3,113 (4,698) (4,398) 4,441 78,669   116,788
Net income (loss) available to common shareholders $ (5,985) $ 18,021 $ (5,387) $ (8,439) $ 46,953 $ 29,891 $ 1,407 $ (6,403) $ (8,945) $ (1,790) $ 71,848   $ 104,562
Net income (loss) per common share - basic $ (0.46) $ 1.40 $ (0.44) $ (0.69) $ 3.95 $ 2.57 $ 0.11 $ (0.54)          
Net income (loss) per common share - diluted $ (0.46) $ 1.38 $ (0.44) $ (0.67) $ 3.89 $ 2.54 $ 0.11 $ (0.54) $ (0.75) $ (0.15) $ 6.00   $ 8.71