Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 31, 2012
Dec. 31, 2011
Oct. 31, 2008
STOCKHOLDERS' EQUITY              
Cash dividend paid     $ 23,435 $ 20,626      
Cash dividend per share (in dollars per share) $ 0.08 $ 0.07 $ 0.16 $ 0.14      
Number of shares repurchased (in shares) 713,781 533,012 781,781 789,296      
Par value of common stock (in dollars per share) $ 1   $ 1     $ 1  
Weighted average stock price of shares repurchased (in dollars per share) $ 21.06 $ 19.37 $ 20.93 $ 19.22      
Number of shares of common stock authorized for repurchase (in shares)         5,000,000   7,500,000
Additional shares that may be purchased under share repurchase program (in shares) 5,300,000   5,300,000        
Common stock issued upon exercise of stock options by employees (in shares) 13,000 43,000 26,000 53,000      
Common stock reserved for issuance upon exercise of stock options (in shares) 4,400,000   4,400,000