EQUITY AND MEZZANINE EQUITY - Series C Preferred Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2018	Mar. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Preferred shares outstanding (in shares)		4,118	4,118
Preferred shares, liquidation preference (in dollars per share)		$ 25.00	$ 25
Preferred shares, annual distribution accrual rate	$ 1.65625
Preferred shares, dividend rate	6.625%
Preferred shares liquidation preference		$ 102,971	$ 102,971