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CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dividends Payable [Line Items]    
Distributions declared to common stockholders $ 434,627,000 $ 347,897,000
Distributions declared per common share (in dollars per share) $ 0.30 $ 0.30
Distributions paid to common stockholders after period end $ 434,431,000 $ 347,897,000
Distributions paid per common share after period end (in dollars per share) $ 0.30 $ 0.30
Series C Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 3,336,000 $ 4,316,000
Preferred series dividends declared (in dollars per share) $ 0.477 $ 0.477
Series D Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 8,625,000 $ 8,625,000
Preferred series dividends declared (in dollars per share) $ 0.469 $ 0.469
Series E Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 0 $ 2,253,000
Preferred series dividends declared (in dollars per share) $ 0.000 $ 0.196
Series F Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 12,510,000 $ 12,510,000
Preferred series dividends declared (in dollars per share) $ 0.434 $ 0.434
Series G Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 6,906,000 $ 6,062,000
Preferred series dividends declared (in dollars per share) $ 0.406 $ 0.357
Series H Preferred Stock    
Dividends Payable [Line Items]    
Preferred dividends declared $ 1,117,000 $ 0.00
Preferred series dividends declared (in dollars per share) $ 0.508 $ 0.00