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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity [Parenthetical] (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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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.

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