NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares used in basic earnings per share calculation	49,093	50,732	49,493	51,643
Effect of dilutive securities:
Stock options	420	425	420	412
Restricted stock units	427	521	425	444
Performance-based restricted stock units	0	0	0	0
Total effects of dilutive securities	847	946	845	856
Shares used in dilutive earnings per share calculation	49,940	51,678	50,338	52,499