NET INCOME PER SHARE (Tables)

12 Months Ended

Dec. 31, 2012

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):

	For the Year Ended December 31,
	2012	2011	2010
Weighted average number of basic common shares outstanding	49,840	49,654	47,955
Weighted average dilutive stock options, restricted stock units and performance share units	501	828	1,628
Assumed conversion of Convertible Senior Notes	985	729	1,405
Weighted average number of diluted common and common equivalent shares outstanding	51,326	51,211	50,988
Anti-dilutive potential common shares	2,202	1,453	2,487