COMMON STOCK AND EARNINGS PER SHARE (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
COMMON STOCK AND EARNINGS PER SHARE
Weighted-average number of common stock outstanding - basic	46,897,309	46,620,897	46,865,438	46,558,520
Potentially dilutive shares resulting from stock plans	696,000	396,000	718,000	498,000
Weighted-average number of common stock outstanding - diluted	47,593,106	47,017,440	47,582,972	47,056,715
Antidilutive awards number not included in the weighted average common shares-diluted	242,000	606,000	164,000	438,000
Earnings per share, other disclosures
Repurchase of common stock, shares			144,714	164,862
Purchase of common stock for treasury			$ 2,513,000	$ 2,622,000
Exercise of stock options, shares			183,036	37,089
Exercise of stock options			$ 2,100,000	$ 400,000
Vested (in shares)			86,630	388,677