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Equity (Preferred Stock) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Oct. 20, 2017
Class of Stock [Line Items]        
Shares Issued and Outstanding   16,200,000 25,800,000  
Carrying Value   $ 476,000,000 $ 699,686,000  
Number of days in year used in the computation of preferred stock dividends for any partial dividend period   360 days 360 days  
Number of months used in the computation of preferred stock dividends for any partial dividend period   12 months 12 months  
Number of days in month, dividends computation of dividends payable for any partial dividend period   30 days 30 days  
Capital gains distribution percentage   100.00% 47.30%  
Unrecaptured Section 1250 gain percentage   27.90% 76.15%  
Long term capital gain percentage   72.10% 23.85%  
Ordinary income percentage     52.70%  
Amount of preferred dividends in arrears   $ 0    
Shares issued upon conversion   3.9087    
Redemption price as a percentage of liquidation preference   100.00% 100.00%  
Maximum        
Class of Stock [Line Items]        
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date   30 days 30 days  
Minimum        
Class of Stock [Line Items]        
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date   10 days 10 days  
Series E and F Preferred Stock        
Class of Stock [Line Items]        
Liquidation preference, value       $ 240,000,000
Redemption premium   $ 16,300,000    
Liquidation Preference (in dollars per share)       $ 25.00
Carrying Value     $ 223,700,000  
Series D, E, F, G and I Preferred Stock        
Class of Stock [Line Items]        
Liquidation Preference (in dollars per share)   $ 25 $ 25.00  
Series D        
Class of Stock [Line Items]        
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 $ 8,000,000  
Series E        
Class of Stock [Line Items]        
Shares Issued and Outstanding     5,600,000  
Par Value (in dollars per share)     $ 0.001  
Liquidation Preference (in dollars per share)     $ 25  
Rate per Annum (as a percent)     7.875%  
Equivalent to Fixed Annual Rate (in dollars per share)     $ 1.97  
Carrying Value     $ 127,136,000  
Dividends declared and paid $ 1,100,000 8,300,000 $ 11,000,000  
Series F        
Class of Stock [Line Items]        
Shares Issued and Outstanding     4,000,000  
Par Value (in dollars per share)     $ 0.001  
Liquidation Preference (in dollars per share)     $ 25  
Rate per Annum (as a percent)     7.80%  
Equivalent to Fixed Annual Rate (in dollars per share)     $ 1.95  
Carrying Value     $ 96,550,000  
Dividends declared and paid $ 800,000 $ 5,900,000 $ 7,800,000  
Series G        
Class of Stock [Line Items]        
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        
Class of Stock [Line Items]        
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)        
Class of Stock [Line Items]        
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 $ 50.00  
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   $ 193,510,000 $ 193,510,000  
Dividends declared and paid   $ 9,000,000 $ 9,000,000  
Conversion price (in dollars per share)   $ 12.79 $ 12.79  
Redemption price as a percentage of liquidation preference   100.00% 100.00%  
Class D, E, F, G, I        
Class of Stock [Line Items]        
Liquidation Preference (in dollars per share)   $ 25.00 $ 25.00