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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan
      
Employee benefit plans      
Contribution made by the entity under the pension plan $ 100,000 $ 100,000 $ 100,000
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   17,000  
Statutorily prescribed annual limit of contributions made by an employee after attaining specified age   22,500  
Specified age limit of employees for calculation of statutorily prescribed annual limit of contribution   50 years  
Contribution made by the entity under the 401(k) Plan $ 100,000 $ 100,000 $ 100,000