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
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Oct. 31, 2008
STOCKHOLDERS' EQUITY.            
Cash dividend paid     $ 20,626 $ 17,856    
Cash dividend per share (in dollars per share) $ 0.07 $ 0.06 $ 0.14 $ 0.12    
Number of shares repurchased (in shares) 533,012 1,135,242 789,296 1,330,392    
Par value of common stock (in dollars per share) $ 1   $ 1   $ 1  
Weighted average stock price of shares repurchased (in dollars per share) $ 19.37 $ 14.14 $ 19.22 $ 13.95    
Number of shares of common stock authorized for repurchase (in shares)           7,500,000
Additional shares that may be purchased under share repurchase program (in shares) 1,700,000   1,700,000      
Common stock issued upon exercise of stock options by employees (in shares) 43,000 1,600 53,000 238,000    
Common stock reserved for issuance upon exercise of stock options (in shares) 5,200,000   5,200,000