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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment          
Property, Plant and Equipment $ (389,391)   $ (298,500) $ (276,811)  
Accumulated Depreciation, Property, Plant and Equipment prior to Assets Held for Sale     186,403 183,849  
Accumulated Depreciation (207,882)   (186,403) (181,853)  
Property, Plant and Equipment, Net 181,509   112,097 94,958  
Impairment loss recorded on fixed assets       622  
Depreciation expense $ 18,515 $ 13,150 17,891 16,550 $ 17,694
Land          
Property, Plant and Equipment          
Property, Plant and Equipment     (6,328) (4,232)  
Buildings and improvements          
Property, Plant and Equipment          
Property, Plant and Equipment     (58,577) (52,118)  
Machinery and manufacturing equipment          
Property, Plant and Equipment          
Property, Plant and Equipment     (116,221) (117,197)  
Office equipment          
Property, Plant and Equipment          
Property, Plant and Equipment     (89,838) (80,972)  
Work in progress          
Property, Plant and Equipment          
Property, Plant and Equipment     (27,536) (24,481)  
Gross Property, Plant and Equipment held for sale          
Property, Plant and Equipment          
Property, Plant and Equipment     0 (2,189)  
Accumulated Depreciation, reduction due to assets held for sale     $ 0 $ 1,996