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Restructuring Charges (Details) (Operating Expense [Member], USD $)
 6 Months Ended
Jun. 30, 2013
Employee
Operating Expense [Member]
  
Restructuring Cost and Reserve [Line Items]  
Number of positions eliminated 27
Severance costs $ 1,500,000
Restructuring Reserve [Roll Forward]  
Severance and restructuring expenses, beginning balance 1,470,000
Restructuring expenses paid by June 30, 2013 (376,000)
Severance and restructuring expenses, ending balance 1,094,000
Amount to be paid out $ 900,000