SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings per Share
Weighted-average shares of common stock outstanding - basic	46,634,834	46,249,571	45,600,043
Potentially dilutive shares resulting from stock plans	424,000	586,000	371,000
Weighted average shares outstanding - diluted	47,059,186	46,835,712	45,970,680
Antidilutive equity awards not included in weighted average common shares-diluted	596,000	164,000	1,701,000