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Restructuring and Impairment Activities (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense $ 400,000 $ 600,000 $ 400,000 $ 1,000,000.0  
Restructuring Reserve [Roll Forward]          
Balance at beginning of year     1,400,000 1,700,000 $ 1,700,000
Accruals for announced programs     400,000   1,300,000
Cash payments     (1,000,000.0)   (3,300,000)
Other     0   1,800,000
Exchange rate impacts     0   (100,000)
Balance at end of period 800,000   800,000   $ 1,400,000
AMS          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense 0.0 400,000 0.0 800,000  
AMS | UNITED STATES | Asset Impairment Charge          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense       200,000  
AMS | UNITED STATES | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense       600,000  
EP          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense $ 400,000 $ 200,000 400,000 200,000  
EP | France and United States | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense       200,000  
EP | Philippines | Asset Impairment Charge          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense     0 $ 0  
EP | FRANCE | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment expense     $ 400,000