COMMON STOCK AND EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
COMMON STOCK AND EARNINGS PER SHARE
Weighted-average number of common shares outstanding - basic	47,760,961	47,365,780	47,705,222	47,283,396
Potentially dilutive shares resulting from stock plans	749,000	609,000	740,000	729,000
Weighted-average number of common shares outstanding - diluted	48,509,546	47,974,559	48,445,060	48,012,233
Antidilutive equity awards number of shares not included in the weighted-average common shares - diluted	0	138,000	0	158,000
Earnings per share, other disclosures
Repurchase of common stock, shares			287,689	379,051
Purchase of common stock for treasury			$ 6,067	$ 6,227
Exercise of stock options, shares			302,750	195,807
Dividends, Common Stock, Cash			$ 11,874
Proceeds from the issuance of common stock			$ 4,421	$ 2,590
Vested (in shares)			281,581	496,191
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	998		272,424