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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plan
      
Employee benefit plans      
Contribution made by the entity under the pension plan $ 100,000 $ 200,000 $ 200,000
401 (k) Plan
      
Employee benefit plans      
Matching contribution by employer as a percentage of the employee's deferral 100.00%    
Matching contribution by employer as a percentage of U.S. employee's qualifying compensation 6.00%    
Statutorily prescribed annual limit of contributions made by an employee before attaining specified age 16,500    
Statutorily prescribed annual limit of contributions made by an employee after attaining specified age 22,000    
Specified age limit of employees for calculation of statutorily prescribed annual limit of contribution 50    
Contribution made by the entity under the 401(k) Plan $ 100,000 $ 100,000 $ 100,000