COMMON STOCK AND EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
COMMON STOCK AND EARNINGS PER SHARE
Weighted-average number of common shares outstanding - basic	46,915,660	46,667,359	46,882,362	46,595,066
Potentially dilutive shares resulting from stock plans	763,000	372,000	733,000	456,000
Weighted-average number of common shares outstanding - diluted	47,679,422	47,038,785	47,615,305	47,051,004
Antidilutive equity awards number not included in the weighted-average common shares - diluted	164,000	606,000	164,000	438,000
Earnings per share, other disclosures
Repurchase of common stock, shares			158,234	224,459
Purchase of common stock for treasury			$ 2,729	$ 3,465
Exercise of stock options, shares			190,036	75,089
Proceeds from the issuance of common stock			$ 2,234	$ 886
Vested (in shares)			111,630	467,927