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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Allocations of Dividends and Declared and Paid for Income Tax Purposes (Details) - $ / shares
 12 Months Ended
Apr. 16, 2019
Jan. 16, 2019
Dec. 31, 2019
Dec. 31, 2018
Shareholders Equity [Line Items]        
Common stock cash dividends per share $ 0.075      
Tax Year 2019        
Shareholders Equity [Line Items]        
Common stock cash dividends per share   $ 0.075    
Common Stock        
Shareholders Equity [Line Items]        
Dividends declared     $ 0.15 $ 0.80 [1]
Allocations     100.00% 100.00%
Common Stock | Ordinary income        
Shareholders Equity [Line Items]        
Allocations       82.83%
Common Stock | Return of capital        
Shareholders Equity [Line Items]        
Allocations     100.00% 17.17%
Preferred Stock        
Shareholders Equity [Line Items]        
Allocations [2]     100.00% 100.00%
Preferred Stock | Ordinary income        
Shareholders Equity [Line Items]        
Allocations [2]       100.00%
Preferred Stock | Return of capital        
Shareholders Equity [Line Items]        
Allocations [2]     100.00%  
Series D Preferred Stock        
Shareholders Equity [Line Items]        
Dividends declared     $ 13.83 $ 18.44
Series E Preferred Stock        
Shareholders Equity [Line Items]        
Dividends declared     $ 12.42 $ 16.56
[1] Of the $0.075 per share dividend declared on October 29, 2018 and paid January 16, 2019, $0.075 was reported and is taxable in 2019.
[2] The allocations for income tax purposes are the same for each series of preferred stock for each period presented.