DEBT - Offer to Repurchase (Details) - HDS (Debt Issuer)	Jan. 31, 2016
5.25% December 2014 Senior Secured First Priority Notes due 2021 | Secured debt
DEBT
Mandatory redemption upon Change of Control, price as a percentage of principal	101.00%
Mandatory offer to purchase if Company sells assets, price as a percentage of principal	100.00%
11.5% October 2012 Senior Unsecured Notes due 2020 | Unsecured debt
DEBT
Mandatory redemption upon Change of Control, price as a percentage of principal	101.00%
Mandatory offer to purchase if Company sells assets, price as a percentage of principal	100.00%
7.5% February 2013 Senior Unsecured Notes due 2020 | Unsecured debt
DEBT
Mandatory redemption upon Change of Control, price as a percentage of principal	101.00%
Mandatory offer to purchase if Company sells assets, price as a percentage of principal	100.00%