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Restructuring Charges (Details) (Operating Expense [Member], USD $)
 9 Months Ended
Sep. 30, 2013
Employee
Operating Expense [Member]
  
Restructuring Cost and Reserve [Line Items]  
Number of positions eliminated 29
Severance costs $ 2,600,000
Restructuring Reserve [Roll Forward]  
Severance and restructuring expenses, beginning balance 2,628,000
Restructuring expenses paid by June 30, 2013 (883,000)
Severance and restructuring expenses, ending balance $ 1,745,000