Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Schedule of Preferred Dividends Declared (Details)

v3.19.1
Stockholders' Equity Schedule of Preferred Dividends Declared (Details) - $ / shares
 3 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Declaration Date Dec. 18, 2018 Sep. 20, 2018 Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017 Sep. 14, 2017 Jun. 15, 2017
Record Date Dec. 31, 2018 Oct. 12, 2018 Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018 Oct. 12, 2017 Jul. 12, 2017
Payment Date Jan. 28, 2019 Oct. 29, 2018 Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018 Oct. 27, 2017 Jul. 27, 2017
Dividends declared per preferred share (in usd per share) $ 0.507810 $ 0.507810 $ 0.507810 $ 0.507810 $ 0.507810 $ 0.507810 $ 0.750430
Series B Preferred Stock [Member]              
Class of Stock [Line Items]              
Declaration Date Dec. 18, 2018 Sep. 20, 2018 Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017 Sep. 14, 2017  
Record Date Dec. 31, 2018 Oct. 12, 2018 Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018 Oct. 12, 2017  
Payment Date Jan. 28, 2019 Oct. 29, 2018 Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018 Oct. 27, 2017  
Dividends declared per preferred share (in usd per share) $ 0.476560 $ 0.476560 $ 0.476560 $ 0.476560 $ 0.476560 $ 0.518920  
Series C Preferred Stock [Member]              
Class of Stock [Line Items]              
Declaration Date Dec. 18, 2018 Sep. 20, 2018 Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017    
Record Date Dec. 31, 2018 Oct. 12, 2018 Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018    
Payment Date Jan. 28, 2019 Oct. 29, 2018 Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018    
Dividends declared per preferred share (in usd per share) $ 0.453130 $ 0.453130 $ 0.453130 $ 0.453130 $ 0.302080    
Series D Preferred Stock [Member]              
Class of Stock [Line Items]              
Declaration Date Dec. 18, 2018 Sep. 20, 2018          
Record Date Dec. 31, 2018 Oct. 01, 2018          
Payment Date Jan. 28, 2019 Oct. 15, 2018          
Dividends declared per preferred share (in usd per share) $ 0.484375 $ 0.484375          
Series E Preferred Stock [Member]              
Class of Stock [Line Items]              
Declaration Date Dec. 18, 2018 Sep. 20, 2018          
Record Date Dec. 31, 2018 Oct. 01, 2018          
Payment Date Jan. 28, 2019 Oct. 15, 2018          
Dividends declared per preferred share (in usd per share) $ 0.468750 $ 0.468750