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Restructuring and Reorganization Charges (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Employees
Jun. 30, 2017
USD ($)
Restructuring Cost And Reserve [Line Items]        
Restructuring and reorganization charges $ 3,329 $ 2,731 $ 4,229 $ 2,979
Reduced workforce | Employees     40  
Termination Benefits Related to Organizational Changes        
Restructuring Cost And Reserve [Line Items]        
Restructuring and reorganization charges     $ 1,800  
Closure of Print Facility        
Restructuring Cost And Reserve [Line Items]        
Restructuring charges and impairment of assets     $ 1,400