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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Allocations of Dividends and Declared and Paid for Income Tax Purposes (Details) - USD ($)
 12 Months Ended
Apr. 16, 2019
Jan. 16, 2019
Jan. 16, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shareholders Equity [Line Items]            
Common stock cash dividends per share $ 0.075          
Accrued dividends and distributions payable         $ 12,949,000  
Tax Year 2018            
Shareholders Equity [Line Items]            
Common stock cash dividends per share     $ 0.200      
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] $ 0.98 [2]
Allocations       100.00% 100.00% 100.00%
Common Stock | Ordinary income            
Shareholders Equity [Line Items]            
Allocations         82.83% 85.37%
Common Stock | Return of capital            
Shareholders Equity [Line Items]            
Allocations       100.00% 17.17% 14.63%
Preferred Stock            
Shareholders Equity [Line Items]            
Allocations [3]       100.00% 100.00% 100.00%
Preferred Stock | Ordinary income            
Shareholders Equity [Line Items]            
Allocations [3]         100.00% 100.00%
Preferred Stock | Return of capital            
Shareholders Equity [Line Items]            
Allocations [3]       100.00%    
Series D Preferred Stock            
Shareholders Equity [Line Items]            
Dividends declared       $ 13.83 $ 18.44 $ 18.44
Series E Preferred Stock            
Shareholders Equity [Line Items]            
Dividends declared       $ 12.42 $ 16.56 $ 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] Of the $0.200 per share dividend declared on November 2, 2017 and paid January 16, 2018, $ 0.200 was reported and is taxable in 2018.
[3] The allocations for income tax purposes are the same for each series of preferred stock for each period presented.