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Equity (Preferred Stock) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Operating loss carryforwards     $ 588,000,000 $ 948,800,000
Shares Issued and Outstanding (in shares) 16,200,000   16,200,000  
Carrying value of preferred stock $ 476,000,000   $ 476,000,000  
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 (as a percent)     100.00%  
Unrecaptured Section 1250 gain (s a percent)     27.90%  
Long term capital gain (as a percent)     72.10%  
Amount of preferred dividends in arrears $ 0      
Shares issued upon conversion 3.9087      
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 D        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares) 4,000,000   4,000,000  
Par Value (in dollars per share) $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25   $ 25  
Rate per Annum 8.00%   8.00%  
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.00   $ 2.00  
Carrying value of preferred stock $ 89,041,000   $ 89,041,000  
Dividends declared and paid $ 2,000,000 $ 2,000,000    
Series G        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares) 3,200,000   3,200,000  
Par Value (in dollars per share) $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25   $ 25  
Rate per Annum 7.65%   7.65%  
Equivalent to Fixed Annual Rate (in dollars per share) $ 1.91   $ 1.91  
Carrying value of preferred stock $ 72,664,000   $ 72,664,000  
Dividends declared and paid $ 1,500,000 1,500,000    
Series I        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares) 5,000,000   5,000,000  
Par Value (in dollars per share) $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25   $ 25  
Rate per Annum 7.50%   7.50%  
Equivalent to Fixed Annual Rate (in dollars per share) $ 1.88   $ 1.88  
Carrying value of preferred stock $ 120,785,000   $ 120,785,000  
Dividends declared and paid $ 2,300,000 2,300,000    
Series J        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares) 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 4.50%   4.50%  
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.25   $ 2.25  
Carrying value of preferred stock $ 193,510,000   $ 193,510,000  
Dividends declared and paid $ 2,300,000 2,300,000    
Conversion price per share (in dollars per share) $ 12.79      
Series E        
Class of Stock [Line Items]        
Dividends declared and paid   2,800,000    
Series F        
Class of Stock [Line Items]        
Dividends declared and paid   $ 2,000,000    
Series G And Series I Preferred Stock [Member]        
Class of Stock [Line Items]        
Redemption price as a percentage of liquidation preference 100.00%