NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares used in basic earnings per share calculation	48,325	49,351	48,347	49,696
Effect of dilutive securities:
Stock options	397	425	392	419
Restricted stock units	321	335	358	421
Performance-based restricted stock units	21	0	16	0
Total effects of dilutive securities	739	760	766	840
Shares used in dilutive earnings per share calculation	49,064	50,111	49,113	50,536