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Restructuring Expenses (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Employee
Accrued Expenses [Member]
    
Restructuring Reserve [Roll Forward]    
Restructuring reserve balance, net $ 1,200,000  
Other non-current liabilities [Member]
    
Restructuring Reserve [Roll Forward]    
Restructuring reserve balance, net 200,000  
Operating Expense [Member]
    
Restructuring Cost and Reserve [Line Items]    
Number of positions eliminated   50
Severance costs   4,000,000
Restructuring Reserve [Roll Forward]    
Restructuring reserve balance, gross   3,974,000
Restructuring expenses paid (2,606,000)  
Restructuring reserve balance, net $ 1,368,000