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SUBSEQUENT EVENTS (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Feb. 10, 2012
Dividend Declared [Member]
Subsequent Event [Line Items]                
Dividend declaration date               Feb. 10, 2012
Cash dividend declared (in dollars per share)               $ 0.495
Percentage increase of dividends declared over dividends paid in fiscal year (in hundredths)               10.00%
Cash dividends paid (in dollars per share) $ 0.45 $ 0.45 $ 0.45 $ 0.45 $ 1.80 $ 1.56 $ 1.42  
Dividend payable date               Mar. 15, 2012
Stockholders of record date               Mar. 01, 2012