TWO Annual report pursuant to Section 13 and 15(d)

Organization and Operations 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
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