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Income Taxes - Schedule of components of distributions made to common stockholders on a per share basis (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dividends, dollars per share      
Ordinary income (in dollars per share) $ 0.04 $ 0.08 $ 1.32
Capital gains (in dollars per share) 0.15 0.02 0.64
Return of capital (in dollars per share) 0.41 1.45 1.04
Dividends paid for income tax purposes (in dollars per share) $ 0.60 $ 1.55 $ 3.00
Dividends, percent      
Ordinary income (as a percent) 6.00% 5.20% 44.20%
Capital gains (as a percent) 24.90% 1.30% 21.20%
Return of capital (as a percent) 69.10% 93.50% 34.60%
Dividends paid (as a percent) 100.00% 100.00% 100.00%