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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

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