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Business Reorganization (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
facility
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Facility Closing [Member]      
Restructuring Cost and Reserve [Line Items]      
Number of facilities eliminated | facility 2    
Curtailment gain   $ 7,217  
Settlement gain   230  
Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   3,756  
Restructuring reserve     $ 204
Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 2,299