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CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Dividends Payable [Line Items] |  |
Dividends and dividend equivalents declared on common stock and share-based awards | $ 308,346 | $ 357,819
Distributions declared per common share (in dollars per share) | $ 0.22 | $ 0.25
Distributions paid to common stockholders after period end | $ 307,671 | $ 357,606
Distributions paid per common share after period end (in dollars per share) | $ 0.22 | $ 0.25
Series D |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 0 | $ 8,625
Preferred series dividends declared (in dollars per share) | $ 0 | $ 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 I |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 7,467 | $ 7,468
Preferred series dividends declared (in dollars per share) | $ 0.422 | $ 0.422

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