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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Stockholders' Equity [Abstract] |  |  |
Income tax benefit of shares and options issued under stock plans | $ 2,894 | $ 4,230 | $ 2,289
Dividends (in dollars per share) | $ 0.18 | $ 0.15 | $ 0.11

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