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Management Actions (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 8,018    
Restructuring Costs and Asset Impairment Charges $ 961    
Approximate time anticipated savings will offset the restructuring charge 1 year    
Restructuring Reserve [Roll Forward]      
Restructuring Charges, net of noncash expenses $ 7,057   $ 3,263
Restructuring Reserve beginning balance 0 $ 1,912  
Cash Payments 5,792 1,912 1,332
Foreign currency adjustments (164)   19
Restructuring Reserve ending balance $ 1,429 $ 0 1,912
Q3 2015 Action [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 1,779
Approximate time anticipated savings will offset the restructuring charge     1 year
Q4 2015 Action [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 1,965
Restructuring Costs and Asset Impairment Charges     $ 481
Approximate time anticipated savings will offset the restructuring charge     1 year 6 months