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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Consolidated Balance Sheets |  |
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, authorized shares | 5,000 | 5,000
Preferred stock, issued shares | 0 | 0
Preferred stock, outstanding shares | 0 | 0
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, authorized shares | 160,000 | 160,000
Common stock, issued shares | 48,163 | 50,096
Common stock, outstanding shares | 48,163 | 50,096

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