INDEBTEDNESS - Second lien credit agreement (Details) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Mar. 05, 2019 USD ($) series shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 $ / shares shares	Mar. 04, 2019 $ / shares
Line of Credit Facility [Line Items]
Gain on extinguishment of debt			$ 7,078
Private Placement | Varde Partners, Inc.
Line of Credit Facility [Line Items]
Number of new series of preferred stock | series	2
Amount canceled in exchange for equity issuance	$ 133,600
Mezzanine equity, shares issued (in shares) | shares	9,891,638
Mezzanine equity, new issues of stock	$ 18,600
Series F Preferred Stock
Line of Credit Facility [Line Items]
Mezzanine equity, shares issued (in shares) | shares		55,000		55,000
Redeemable preferred stock, dividend rate, percentage		9.00%		9.00%
Mezzanine equity, stated value (in dollars per share) | $ / shares		$ 1,100		$ 1,076
Series F Preferred Stock | Private Placement | Varde Partners, Inc.
Line of Credit Facility [Line Items]
Mezzanine equity, shares issued (in shares) | shares	55,000
Redeemable preferred stock, dividend rate, percentage	9.00%
Mezzanine equity, new issues of stock	$ 55,000
Series E Preferred Stock
Line of Credit Facility [Line Items]
Mezzanine equity, shares issued (in shares) | shares		60,000		60,000
Redeemable preferred stock, dividend rate, percentage		8.25%		8.25%
Mezzanine equity, stated value (in dollars per share) | $ / shares		$ 1,092		$ 1,069
Series E Preferred Stock | Private Placement
Line of Credit Facility [Line Items]
Mezzanine equity, stated value (in dollars per share) | $ / shares					$ 1.88
Series E Preferred Stock | Private Placement | Varde Partners, Inc.
Line of Credit Facility [Line Items]
Mezzanine equity, shares issued (in shares) | shares	60,000
Redeemable preferred stock, dividend rate, percentage	8.25%
Mezzanine equity, new issues of stock	$ 60,000
Additional Paid-In Capital
Line of Credit Facility [Line Items]
Gain on extinguishment of debt		$ 7,100	$ 7,078