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
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Oct. 31, 2008
STOCKHOLDERS' EQUITY        
Cash dividend paid $ 11,726 $ 10,318    
Cash dividend per share (in dollars per share) $ 0.08 $ 0.07    
Number of shares repurchased (in shares) 68,000 256,284    
Par value of common stock (in dollars per share) $ 1   $ 1  
Weighted average stock price of shares repurchased (in dollars per share) $ 19.58 $ 18.90    
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) 1,000,000      
Common stock issued upon exercise of stock options by employees (in shares) 13,000 10,000    
Common stock reserved for issuance upon exercise of stock options (in shares) 4,400,000