NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares used in basic earnings per share calculation	48,345	49,093	48,346	49,493
Effect of dilutive securities:
Stock options	278	420	355	420
Restricted stock units	291	427	332	425
Performance-based restricted stock units	22		19
Total effects of dilutive securities	591	847	706	845
Shares used in dilutive earnings per share calculation	48,936	49,940	49,052	50,338