Quarterly report pursuant to Section 13 or 15(d)

Organization and Operations Acquisition of CYS Investments, Inc. (Details)

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Organization and Operations Acquisition of CYS Investments, Inc. (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Mar. 22, 2019
Jul. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Class of Stock [Line Items]        
Aggregate cash consideration exchanged for shares of CYS common stock   $ 15.0    
Common Stock [Member]        
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares) 18,000,000 72,600,000 24,399,107 72,608,932
Series D Preferred Stock [Member]        
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares)   3,000,000    
Series E Preferred Stock [Member]        
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares)   8,000,000