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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Basic earnings per share:    
Net income$ 7,512$ 12,634$ 27,965$ 40,534
Weighted Average Common Shares28,799,00027,894,00028,789,00027,737,000
Basic earnings per share$ 0.26$ 0.45$ 0.97$ 1.46
Diluted earnings per share:    
Net income$ 7,512$ 12,634$ 27,965$ 40,534
Weighted Average Common Shares28,799,00027,894,00028,789,00027,737,000
Effect of dilutive securities:    
Employee stock plans1,080,000[1]1,389,000[1]1,406,000[1]1,669,000[1]
Diluted weighted average common shares29,879,000[1]29,283,000[1]30,195,000[1]29,406,000[1]
Diluted earnings per share$ 0.25[1]$ 0.43[1]$ 0.93[1]$ 1.38[1]
Antidilutive shares attributable to stock-based awards outstanding excluded from computation of diluted earnings per share410,000530,000276,000139,000
[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 2011 and 2010 awards as those shares were not contingently issuable as of the end of the period.