Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Schedule of Preferred Dividends Declared (Details)

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Stockholders' Equity Schedule of Preferred Dividends Declared (Details) - $ / shares
3 Months Ended
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 Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017 Sep. 14, 2017 Jun. 15, 2017
Record Date Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018 Oct. 12, 2017 Jul. 12, 2017
Payment Date Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018 Oct. 27, 2017 Jul. 27, 2017
Dividends declared per preferred share (in usd per share) $ 0.50781 $ 0.50781 $ 0.50781 $ 0.50781 $ 0.75043
Series B Preferred Stock [Member]          
Class of Stock [Line Items]          
Declaration Date Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017 Sep. 14, 2017  
Record Date Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018 Oct. 12, 2017  
Payment Date Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018 Oct. 27, 2017  
Dividends declared per preferred share (in usd per share) $ 0.47656 $ 0.47656 $ 0.47656 $ 0.51892  
Series C Preferred Stock [Member]          
Class of Stock [Line Items]          
Declaration Date Jun. 19, 2018 Mar. 20, 2018 Dec. 14, 2017    
Record Date Jul. 12, 2018 Apr. 12, 2018 Jan. 12, 2018    
Payment Date Jul. 27, 2018 Apr. 27, 2018 Jan. 29, 2018    
Dividends declared per preferred share (in usd per share) $ 0.45313 $ 0.45313 $ 0.30208