EARNINGS PER SHARE (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted-average shares of common stock outstanding—basic (in shares)	47,346,532	46,916,845	46,634,834
Potentially dilutive shares resulting from stock plans (in shares)	721,000	742,000	424,000
Weighted-average common shares—diluted (in shares)	48,068,249	47,659,418	47,059,186
Antidilutive equity awards not included in weighted-average common shares—diluted (in shares)	144,000	164,000	596,000