COMMON STOCK AND EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
COMMON STOCK AND EARNINGS PER SHARE
Weighted-average number of common shares outstanding - basic	47,365,780	46,897,309	47,283,396	46,865,438
Potentially dilutive shares resulting from stock plans	609,000	696,000	729,000	718,000
Weighted-average number of common shares outstanding - diluted	47,974,559	47,593,106	48,012,233	47,582,972
Antidilutive equity awards number of shares not included in the weighted-average common shares - diluted	138,000	242,000	158,000	164,000
Earnings per share, other disclosures
Repurchase of common stock, shares			379,051	144,714
Purchase of common stock for treasury			$ 6,227	$ 2,513
Exercise of stock options, shares			195,807	183,036
Dividends, Common Stock, Cash			11,363
Proceeds from the issuance of common stock			$ 2,590	$ 2,147
Vested (in shares)			496,191	86,630
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	420,000		1,081,919