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

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