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NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |
Shares used in basic earnings per share calculation | 51,861 | 55,125 | 52,104 | 55,809
Effect of dilutive securities: |  |  |  |
Stock options | 411 | 359 | 403 | 379
Restricted stock units | 356 | 228 | 405 | 370
Performance-based restricted stock units | 0 | 0 | 0 | 0
Total effects of dilutive securities | 767 | 587 | 808 | 749
Shares used in dilutive earnings per share calculation | 52,628 | 55,712 | 52,912 | 56,558

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