LOSS PER SHARE (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator for basic and diluted loss per share:
Net loss	$ (12,631)	$ (21,393)
Denominator:
Basic shares outstanding (in shares)	56,457	57,262
Dilutive effect of equity-based compensation awards (in shares)	0	0
Dilutive shares outstanding (in shares)	56,457	57,262
Basic loss per share (in USD per share)	$ (0.22)	$ (0.37)
Diluted loss per share (in USD per share)	$ (0.22)	$ (0.37)