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NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]                      
Shares used in basic earnings per share calculation 53,262 54,093 55,125 56,493 56,309 56,476 56,713 57,190 54,738 56,669 60,361
Effect of dilutive securities:                      
Stock options                 378 727 874
Restricted stock units                 424 564 557
Performance-based restricted stock units                   3  
Total effects of dilutive securities                 802 1,294 1,431
Shares used in dilutive earnings per share calculation 54,196 54,905 55,712 57,418 57,500 57,748 57,974 58,797 55,540 57,963 61,792