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Stockholder Rights Plan (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2009
2009 Amendment to Stockholder Rights Plan, Percentage at which a Person Becomes an Acquiring Person, Former   15.00%
2009 Amendment to Stockholder Rights Plan, Percentage at which a Person Becomes an Acquiring Person, Amended   4.99%
2009 Amendment to Stockholder Rights Plan, Percentage of Beneficial Ownership, Exemption Percentage   5.00%
2011 Amendment to Stockholder Rights Plan, Percentage at which a Person Becomes an Acquiring Person, Former 4.99%  
Entity Listing, Par Value Per Share $ 0.01  
2011 Amendment to Stockholder Rights Plan, Percentage at which a Person Becomes an Acquiring Person, Amended 15.00%