Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events Acquisition of CYS Investments, Inc. (Details)

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Subsequent Events Acquisition of CYS Investments, Inc. (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Aggregate cash consideration exchanged for shares of CYS common stock $ 15,000    
Common Stock [Member]      
Subsequent Event [Line Items]      
Number of shares of stock issued during period (in shares)   12,468 13,219
Common Stock [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Number of shares of stock issued during period (in shares) 72,600,000    
Series D Preferred Stock [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Number of shares of stock issued during period (in shares) 3,000,000    
Series E Preferred Stock [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Number of shares of stock issued during period (in shares) 8,000,000