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CAPITAL STOCK - Summary of Dividend Distribution Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |
Distributions declared to common stockholders | $ 1,516,323,000 | $ 1,457,007,000
Distributions declared per common share (in dollars per share) | $ 1.05 | $ 1.20
Distributions paid to common stockholders after period end | $ 357,527,000 | $ 394,129,000
Distributions paid per common share after period end (in dollars per share) | $ 0.25 | $ 0.30
Series C Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 7,414,000 | $ 14,323,000
Preferred series dividends declared (in dollars per share) | $ 1.060 | $ 1.906
Series D Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 34,500,000 | $ 34,500,000
Preferred series dividends declared (in dollars per share) | $ 1.875 | $ 1.875
Series E Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 0 | $ 2,253,000
Preferred series dividends declared (in dollars per share) | $ 0 | $ 0.196
Series F Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 50,040,000 | $ 50,040,000
Preferred series dividends declared (in dollars per share) | $ 1.738 | $ 1.738
Series G Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 27,624,000 | $ 26,781,000
Preferred series dividends declared (in dollars per share) | $ 1.625 | $ 1.575
Series H Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 1,862,000 | $ 1,415,000
Preferred series dividends declared (in dollars per share) | $ 0.846 | $ 0.643
Series I Preferred Stock |  |
Dividends Payable [Line Items] |  |
Preferred dividends declared | $ 15,135,000 | $ 0
Preferred series dividends declared (in dollars per share) | $ 0.858 | $ 0

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