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Equity (Preferred Stock) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Preferred Stock    
Shares Issued and Outstanding 16,200,000 16,200,000
Carrying Value $ 282,490,000 $ 476,000,000
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 12 months  
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% 26.02%
Long term capital gain percentage   73.98%
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  
Series D    
Preferred Stock    
Shares Issued and Outstanding 4,000,000 4,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Liquidation Preference (in dollars per share) $ 25.00 $ 25
Rate per Annum (as a percent) 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
Dividends declared and paid $ 8,000,000.0 $ 8,000,000
Series G    
Preferred Stock    
Shares Issued and Outstanding 3,200,000 3,200,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Liquidation Preference (in dollars per share) $ 25.00 $ 25
Rate per Annum (as a percent) 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
Dividends declared and paid $ 6,100,000 $ 6,100,000
Series I    
Preferred Stock    
Shares Issued and Outstanding 5,000,000 5,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Liquidation Preference (in dollars per share) $ 25.00 $ 25
Rate per Annum (as a percent) 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
Dividends declared and paid $ 9,400,000 $ 9,400,000
Series J convertible perpetual preferred stock    
Preferred Stock    
Shares Issued and Outstanding 4,000,000 4,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Liquidation Preference (in dollars per share) $ 50.00 $ 50
Rate per Annum (as a percent) 4.50% 4.50%
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.25 $ 2.25
Carrying Value $ 0 $ 193,510,000
Common stock to redeem outstanding shares 16,500,000  
Dividends declared and paid $ 9,000,000.0 9,000,000.0
Shares issued upon conversion 4.125  
Series E and F Preferred Stock    
Preferred Stock    
Carrying Value   $ 193,500,000
Series D, E, F, G and I Preferred Stock    
Preferred Stock    
Liquidation Preference (in dollars per share)   $ 50.00
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%