COMMON STOCK AND EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
COMMON STOCK AND EARNINGS PER SHARE
Weighted-average number of common shares outstanding - basic	47,376,605	46,915,660	47,314,810	46,882,362
Potentially dilutive shares resulting from stock plans	696,000	763,000	718,000	733,000
Weighted-average number of common shares outstanding - diluted	48,072,632	47,679,422	48,032,710	47,615,305
Antidilutive equity awards - Number of shares not included in the weighted-average common shares - diluted	124,000	164,000	144,000	164,000
Earnings per share, other disclosures
Repurchase of common stock, shares			388,938	158,234
Purchase of common stock for treasury			$ 6,412	$ 2,729
Exercise of stock options, shares			211,057	190,036
Proceeds from the issuance of common stock			$ 2,788	$ 2,234
Vested (in shares)			496,191	111,630
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	25,000	1,106,919