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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity [Parenthetical] (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dividends per share (1) (in dollars per share) $ 0.19 [1] $ 0.18 [1]
Exercise of stock options (in shares) 1,000   
Excess tax benefit related to stock option plans (in dollars) $ 1 $ 0
[1] Share and per share values for the period ended March 31, 2012 have been adjusted to give effect to the 5% stock dividend paid during December 2012.