NET INCOME PER SHARE (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Reconciliation of the weighted average number of shares outstanding used in calculating diluted earnings per share

A reconciliation of the weighted average number of shares outstanding used in calculating diluted earnings per share is as follows (in thousands): 

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Weighted average number of basic common shares outstanding	50,760	49,812	50,348	49,819
Weighted average dilutive stock options, restricted stock units and performance share units	207	354	277	492
Assumed conversion of convertible debt	1,144	1,060	1,107	995
Weighted average number of diluted common and common equivalent shares outstanding	52,111	51,226	51,732	51,306
Anti-dilutive potential common shares	3,108	2,295	3,044	2,247