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Dividends on Common Stock (Unaudited)
6 Months Ended
Jun. 30, 2011
DIVIDENDS ON COMMON STOCK [Abstract]  
3. DIVIDENDS ON COMMON STOCK
 
3.   DIVIDENDS ON COMMON STOCK
 
Dividends on Common Stock – In April 2011, the company’s board of directors approved an increase to the quarterly common stock dividend from $0.47 per share to $0.50 per share, for shareholders of record as of May 31, 2011.
 
In May 2010, the company’s board of directors approved an increase to the quarterly common stock dividend from $0.43 per share to $0.47 per share, for shareholders of record as of June 1, 2010.