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Restructuring and Reorganization Charges (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Employees
Sep. 30, 2017
USD ($)
Restructuring Cost And Reserve [Line Items]        
Restructuring and reorganization charges $ 2,799 $ 1,618 $ 7,028 $ 4,597
Reduced workforce | Employees     70  
Termination Benefits Related to Organizational Changes        
Restructuring Cost And Reserve [Line Items]        
Restructuring and reorganization charges     $ 3,500  
Closure of Print Facility        
Restructuring Cost And Reserve [Line Items]        
Restructuring charges and impairment of assets     $ 2,100