EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Basic earnings per share:
Net income (loss)	$ (44,406)	[1]	$ 7,512	[1]	$ (44,121)	[1]	$ 27,965	[1]
Weighted-average common shares	28,908,000	[1]	28,799,000	[1]	28,586,000	[1]	28,789,000	[1]
Basic earnings (loss) per share	$ (1.54)		$ 0.26		$ (1.54)		$ 0.97
Diluted earnings per share:
Net income (loss)	$ (44,406)	[1]	$ 7,512	[1]	$ (44,121)	[1]	$ 27,965	[1]
Weighted-average common shares	28,908,000	[1]	28,799,000	[1]	28,586,000	[1]	28,789,000	[1]
Effect of dilutive securities:
Employee stock plans	0	[1]	1,080,000	[1]	0	[1]	1,406,000	[1]
Diluted weighted-average common shares	28,908,000	[1]	29,879,000	[1]	28,586,000	[1]	30,195,000	[1]
Diluted earnings (loss) per share	$ (1.54)	[1]	$ 0.25	[1]	$ (1.54)	[1]	$ 0.93	[1]
Antidilutive shares attributable to stock-based awards outstanding excluded from computation of diluted earnings per share			410,000				276,000

[1] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share when they become contingently issuable per ASC 260-10, Earnings per Share and excludes such shares when they are not contingently issuable. The Company has excluded all performance-based awards underlying the fiscal 2012 and 2011 awards as those shares were not contingently issuable as of the end of the periods reported.