(LOSS) EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (93,337)	$ 35,361	$ (55,705)	$ 68,765
Denominator:
Basic shares outstanding	60,369	60,610	60,585	60,542
Dilutive effect of equity-based compensation awards	0	150	0	150
Dilutive shares outstanding	60,369	60,760	60,585	60,692
Basic earnings per share (in USD per share)	$ (1.55)	$ 0.58	$ (0.92)	$ 1.14
Diluted earnings per share (in USD per share)	$ (1.55)	$ 0.58	$ (0.92)	$ 1.13