CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Dividends Payable [Line Items]
Dividends and dividend equivalents declared on common stock and share-based awards	$ 357,819	$ 434,627
Distributions declared per common share (in dollars per share)	$ 0.25	$ 0.30
Distributions paid to common stockholders after period end	$ 357,606	$ 434,431
Distributions paid per common share after period end (in dollars per share)	$ 0.25	$ 0.30
Series C
Dividends Payable [Line Items]
Preferred dividends declared	$ 0	$ 3,336
Preferred series dividends declared (in dollars per share)	$ 0	$ 0.477
Series D
Dividends Payable [Line Items]
Preferred dividends declared	$ 8,625	$ 8,625
Preferred series dividends declared (in dollars per share)	$ 0.469	$ 0.469
Series F
Dividends Payable [Line Items]
Preferred dividends declared	$ 12,510	$ 12,510
Preferred series dividends declared (in dollars per share)	$ 0.434	$ 0.434
Series G
Dividends Payable [Line Items]
Preferred dividends declared	$ 6,906	$ 6,906
Preferred series dividends declared (in dollars per share)	$ 0.406	$ 0.406
Series H
Dividends Payable [Line Items]
Preferred dividends declared	$ 0	$ 1,117
Preferred series dividends declared (in dollars per share)	$ 0	$ 0.508
Series I
Dividends Payable [Line Items]
Preferred dividends declared	$ 7,468	$ 0
Preferred series dividends declared (in dollars per share)	$ 0.422	$ 0