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CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Dividends Payable [Line Items] |  |
Distributions declared to common stockholders | $ 1,285,124 | $ 1,516,323
Distributions declared per common share (in dollars per share) | $ 0.91 | $ 1.05
Distributions paid to common stockholders after period end | $ 307,613 | $ 357,527
Distributions paid per common share after period end (in dollars per share) | $ 0.22 | $ 0.25
Series C Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 0 | $ 7,414
Preferred series dividends declared (in dollars per share) | $ 0 | $ 1.060
Series D Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 34,500 | $ 34,500
Preferred series dividends declared (in dollars per share) | $ 1.875 | $ 1.875
Series F Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 50,040 | $ 50,040
Preferred series dividends declared (in dollars per share) | $ 1.738 | $ 1.738
Series G Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 27,625 | $ 27,624
Preferred series dividends declared (in dollars per share) | $ 1.625 | $ 1.625
Series H Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 0 | $ 1,862
Preferred series dividends declared (in dollars per share) | $ 0 | $ 0.846
Series I Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 29,871 | $ 15,135
Preferred series dividends declared (in dollars per share) | $ 1.688 | $ 0.86

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