INCOME TAX Income Tax Disclosure (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Net operating loss carryforward		$ 676.2
Ownership interest percentage, without Board approval, that triggers the stockholder rights plan (percent)	4.75%
Rights Agreement, exercise price per unit (in dollars per unit)	$ 10.00
Series A participating preferred stock
Business Acquisition [Line Items]
Fraction of share represented by each right under the Rights Agreement (shares)	0.00010
Preferred stock, par value (in dollars per share)	$ 0.01