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Equity - Preferred Stock (Details) - $ / shares
6 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
May 01, 2017
Mar. 31, 2017
Feb. 15, 2017
Dec. 30, 2016
Nov. 02, 2016
Sep. 30, 2016
Aug. 01, 2016
Jun. 30, 2016
May 02, 2016
Mar. 31, 2016
Feb. 22, 2016
Jun. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]                              
Preferred stock, shares authorized   15,000,000                       15,000,000 15,000,000
Preferred stock, par value (in dollars per share)   $ 0.01                       $ 0.01 $ 0.01
Series B Preferred Stock                              
Class of Stock [Line Items]                              
Preferred Stock, Dividends Per Share, Declared     $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625 0.8281250 1.6562500
Preferred Stock, Dividends, Per Share, Cash Paid   0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.4140625   $ 0.8281250 1.6562500
Number of shares sold                           2,800,000  
Issue price (in dollars per share)   25.00                       $ 25.00  
Dividend rate (as a percent)                           6.625%  
Series B Preferred Stock | Non-recognized Subsequent Event                              
Class of Stock [Line Items]                              
Preferred Stock, Dividends Per Share, Declared $ 0.4140625                            
Series C Preferred Stock                              
Class of Stock [Line Items]                              
Preferred Stock, Dividends Per Share, Declared     $ 0.4296875   $ 0.4296875   0.4296875   0.4296875   0.4965300   0.0000000 $ 0.8593750 1.3559050
Preferred Stock, Dividends, Per Share, Cash Paid   0.4296875   $ 0.4296875   0.4296875   0.4296875   0.4965300       $ 0.8593750 1.3559050
Number of shares sold                           3,000,000  
Issue price (in dollars per share)   $ 25.00                       $ 25.00  
Dividend rate (as a percent)                           6.875%  
Series C Preferred Stock | Non-recognized Subsequent Event                              
Class of Stock [Line Items]                              
Preferred Stock, Dividends Per Share, Declared $ 0.4296875                            
Series A Preferred Stock                              
Class of Stock [Line Items]                              
Preferred Stock, Dividends Per Share, Declared             0.19375   $ 0.56250   $ 0.56250   $ 0.56250   1.88125
Preferred Stock, Dividends, Per Share, Cash Paid           $ 0.19375   $ 0.56250   $ 0.56250   $ 0.56250     $ 1.88125
Preferred Stock, Redemption Price Per Share             $ 25.00