Annual report pursuant to Section 13 and 15(d)

Equity and Mezzanine Equity - Dividends Declared (Details)

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Equity and Mezzanine Equity - Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Dividends declared amount $ 9,790 $ 23,446 $ 20,041
Common Stock      
Class of Stock [Line Items]      
Dividends declared amount $ 0 $ 13,477 $ 15,328
Dividends declared per common share (in dollars per share) $ 0 $ 1,440.00 $ 1,680.00
Preferred Stock      
Class of Stock [Line Items]      
Dividends declared amount $ 9,790 $ 9,969 $ 4,713
Series A Preferred Stock      
Class of Stock [Line Items]      
Dividends declared per common share (in dollars per share) $ 67,500.00 $ 90,000 $ 90,000
Series B Preferred Stock      
Class of Stock [Line Items]      
Dividends declared per common share (in dollars per share) 1,690.00 2,250.00 2,250.00
Series D Preferred Stock      
Class of Stock [Line Items]      
Dividends declared per common share (in dollars per share) $ 1,640.00 $ 2,190.00 $ 610.00