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NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |
Shares used in basic earnings per share calculation | 52,347 | 56,493
Effect of dilutive securities: |  |
Stock options | 391 | 396
Restricted stock units | 479 | 529
Total effects of dilutive securities | 870 | 925
Shares used in dilutive earnings per share calculation | 53,217 | 57,418

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