(LOSS) EARNINGS PER SHARE (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (12,713)	$ (10,255)	$ 3,966	$ (20,871)	$ 568	$ 40,228	$ 10,395	$ (7,089)	$ (39,873)	$ 44,102	$ (28,328)
Denominator:
Weighted basic shares outstanding (in shares)									57,532	58,324	60,311
Dilutive effect of equity-based compensation awards (in shares)									0	110	0
Weighted dilutive shares outstanding (in shares)									57,532	58,434	60,311
Basic earnings per share (in dollars per share)									$ (0.69)	$ 0.76	$ (0.47)
Diluted earnings per share (in dollars per share)									$ (0.69)	$ 0.76	$ (0.47)