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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Stockholders' Equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, dividend rate 8.25% 8.25%
Liquidation preference per share (in dollars per share) $ 25.00 $ 25.00
Preferred stock, shares issued (in shares) 4,760,000 4,760,000
Preferred stock, shares outstanding (in shares) 4,760,000 4,760,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 210,619,840 210,073,514
Common stock, shares outstanding (in shares) 210,619,840 210,073,514