Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. (Details)

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Stockholders' Equity Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares)       30,301
Aggregate cash consideration exchanged for shares of CYS common stock $ 14,967      
Common Stock [Member]        
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares) 72,587,772 72,616,483 26,950