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, 2013
Mar. 31, 2012
Dec. 31, 2012
Jul. 31, 2012
STOCKHOLDERS' EQUITY        
Cash dividend paid $ 13,146 $ 11,726    
Cash dividend per share (in dollars per share) $ 0.09 $ 0.08    
Number of shares repurchased (in shares)   68,000    
Par value of common stock (in dollars per share) $ 1   $ 1  
Weighted average stock price of shares repurchased (in dollars per share)   $ 19.58    
Number of shares of common stock authorized for repurchase (in shares)       5,000,000
Repurchase of common stock from employees 4,500,000 3,400,000    
Additional shares that may be purchased under share repurchase program (in shares) 5,300,000      
Common stock reserved for issuance upon exercise of stock options (in shares) 4,000,000