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Equity (Preferred Stock) (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
mo
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Preferred Stock      
Shares issued and outstanding (in shares) | shares 12,200,000 12,200,000 12,200,000
Liquidation preference (in dollars per share) $ 25.00 $ 25.00 $ 25.00
Carrying value | $ $ 282,490,000 $ 282,490,000 $ 282,490,000
Number of days in year used in the computation of preferred stock dividends for any partial dividend period   360 days  
Dividends payable for any partial dividend period number of months | mo   12  
Number of days in month, dividends computation of dividends payable for any partial dividend period   30 days  
Capital gains distribution percentage   100.00% 100.00%
Unrecaptured Section 1250 gain percentage     34.01%
Amount of preferred dividends in arrears | $   $ 0  
Maximum      
Preferred Stock      
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date   30 days  
Minimum      
Preferred Stock      
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date   10 days  
Convertible Preferred Stock Series J      
Class of Stock [Line Items]      
Common stock to redeem outstanding shares | shares 16,500,000    
Shares issued upon conversion | shares 4.125   4.125
Preferred Stock      
Liquidation preference (in dollars per share) $ 50.00   $ 50.00
Carrying value | $ $ 193,500,000   $ 193,500,000
Dividends declared and paid | $     $ 9,000,000.0
Series D      
Preferred Stock      
Shares issued and outstanding (in shares) | shares 4,000,000 4,000,000 4,000,000
Par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Liquidation preference (in dollars per share) $ 25.00 $ 25.00 $ 25.00
Rate per annum   8.00% 8.00%
Equivalent to fixed annual rate (in dollars per share)   $ 2.00 $ 2.00
Carrying value | $ $ 89,041,000 $ 89,041,000 $ 89,041,000
Dividends declared and paid | $   $ 8,000,000.0 $ 8,000,000.0
Series G      
Preferred Stock      
Shares issued and outstanding (in shares) | shares 3,200,000 3,200,000 3,200,000
Par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Liquidation preference (in dollars per share) $ 25.00 $ 25.00 $ 25.00
Rate per annum   7.65% 7.65%
Equivalent to fixed annual rate (in dollars per share)   $ 1.91 $ 1.91
Carrying value | $ $ 72,664,000 $ 72,664,000 $ 72,664,000
Dividends declared and paid | $   $ 6,100,000 $ 6,100,000
Series I      
Preferred Stock      
Shares issued and outstanding (in shares) | shares 5,000,000 5,000,000 5,000,000
Par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Liquidation preference (in dollars per share) $ 25.00 $ 25.00 $ 25.00
Rate per annum   7.50% 7.50%
Equivalent to fixed annual rate (in dollars per share)   $ 1.88 $ 1.88
Carrying value | $ $ 120,785,000 $ 120,785,000 $ 120,785,000
Dividends declared and paid | $   $ 9,400,000 $ 9,400,000
Series G and I Preferred Stock      
Preferred Stock      
Liquidation preference (in dollars per share)   $ 25.00  
Redemption price as a percentage of liquidation preference   100.00%