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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jul. 31, 2012
Dec. 31, 2011
STOCKHOLDERS' EQUITY            
Cash dividend paid     $ 35,108 $ 30,890    
Cash dividend per share (in dollars per share) $ 0.08 $ 0.07 $ 0.24 $ 0.21    
Number of shares repurchased (in shares)   598,986 781,781 1,388,282    
Par value of common stock (in dollars per share) $ 1   $ 1     $ 1
Weighted average stock price of shares repurchased (in dollars per share)   $ 17.85 $ 20.93 $ 18.63    
Number of shares of common stock authorized for repurchase (in shares)         5,000,000  
Additional shares that may be purchased under share repurchase program (in shares) 5,300,000   5,300,000      
Common stock reserved for issuance upon exercise of stock options (in shares) 4,400,000   4,400,000