EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Basic earnings per share:
Net income (loss)	$ (7,176)		$ 10,599		$ 285		$ 20,453
Weighted-average common shares	28,619,000		28,938,000		28,423,000		28,784,000
Basic earnings (loss) per share	$ (0.25)		$ 0.37		$ 0.01		$ 0.71
Diluted earnings per share (1):
Net income (loss)	$ (7,176)		$ 10,599		$ 285		$ 20,453
Weighted-average common shares	28,619,000		28,938,000		28,423,000		28,784,000
Effect of dilutive securities:
Employee stock plans	0	[1]	1,408,000	[1]	1,201,000	[1]	1,487,000	[1]
Diluted weighted-average common shares	28,619,000	[1]	30,346,000	[1]	29,624,000	[1]	30,271,000	[1]
Diluted earnings (loss) per share	$ (0.25)	[1]	$ 0.35	[1]	$ 0.01	[1]	$ 0.68	[1]
Antidilutive shares attributable to stock-based awards outstanding excluded from computation of diluted earnings per share			262,533		306,586		234,700

[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.