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CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Dividends Payable [Line Items] |  |  |  |
Dividends and dividend equivalents declared on common stock and share-based awards | $ 309,972,000 | $ 364,266,000 | $ 667,791,000 | $ 798,893,000
Distributions declared per common share (in dollars per share) | $ 0.22 | $ 0.25 | $ 0.47 | $ 0.55
Distributions paid to common stockholders after period end | $ 309,686,000 | $ 364,066,000 | $ 309,686,000 | $ 364,066,000
Distributions paid per common share after period end (in dollars per share) | $ 0.22 | $ 0.25 | $ 0.22 | $ 0.25
Series C |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 0 | $ 3,336,000 | $ 0 | $ 6,672,000
Preferred series dividends declared (in dollars per share) | $ 0 | $ 0.477 | $ 0 | $ 0.953
Series D |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 8,625,000 | $ 8,625,000 | $ 17,250,000 | $ 17,250,000
Preferred series dividends declared (in dollars per share) | $ 0.469 | $ 0.469 | $ 0.938 | $ 0.938
Series F |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 12,510,000 | $ 12,510,000 | $ 25,020,000 | $ 25,020,000
Preferred series dividends declared (in dollars per share) | $ 0.434 | $ 0.434 | $ 0.869 | $ 0.868
Series G |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 6,906,000 | $ 6,906,000 | $ 13,812,000 | $ 13,812,000
Preferred series dividends declared (in dollars per share) | $ 0.406 | $ 0.406 | $ 0.813 | $ 0.813
Series H |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 0 | $ 745,000 | $ 0 | $ 1,862,000
Preferred series dividends declared (in dollars per share) | $ 0 | $ 0.339 | $ 0 | $ 0.846
Series I |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred dividends declared | $ 7,468,000 | $ 0 | $ 14,936,000 | $ 0
Preferred series dividends declared (in dollars per share) | $ 0.422 | $ 0 | $ 0.844 | $ 0

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