(LOSS) EARNINGS PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (10,255)	$ 40,228	$ (27,160)	$ 43,534
Denominator:
Basic shares outstanding (in shares)	57,487	58,161	57,575	58,799
Dilutive effect of equity-based compensation awards (in shares)	0	107	0	99
Dilutive shares outstanding (in shares)	57,487	58,268	57,575	58,898
Basic earnings (loss) per share (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74
Diluted earnings (loss) per share (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74