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Stockholders' Equity - Dividends Declared (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]            
Dividends declared on common stock (in dollars per share) $ 0.35 $ 0.35 $ 0.35 $ 0.40 $ 0.70 $ 0.75
Dividends declared (in dollars per share) 0.50 $ 0.50 0.50 $ 0.50    
Common Stock            
Class of Stock [Line Items]            
Dividends declared on common stock (in dollars per share) 0.35   0.35   0.70 0.75
Series B Preferred Stock            
Class of Stock [Line Items]            
Dividends declared (in dollars per share) $ 0.50   $ 0.50   $ 1.00 $ 1.00