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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 10, 2012 | Sep. 30, 2001
Common Stock Repurchase Authorized |  |  |  |  |
Stock Repurchase Shares Authorized | 3,225 | 2,243 |  | 5,000 | 15,400
Share repurchase authorization increase |  |  |  | 2,757 |
Treasury Stock, Shares, Acquired | 1,775 | 4,214 | 0 |  |
Repurchases of Common Stock | $ 24,190 | $ 56,350 | $ 0 |  |

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