TWO Quarterly report pursuant to Section 13 or 15(d)

Organization and Operations Acquisition of CYS Investments, Inc. (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Mar. 22, 2019	Jul. 31, 2018	Mar. 31, 2019	Mar. 31, 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	24,377,530	4,921
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