Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details)

v3.8.0.1
Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 351,013 $ 335,058  
Accumulated depreciation (155,147) (131,327)  
Property, plant and equipment, less capital work-in-progress 195,866 203,731  
Construction work in progress 4,085 4,684  
Property, plant and equipment, net 199,951 208,415  
Depreciation 31,600 33,800 $ 33,400
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 133,656 128,185  
Buildings and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 131,993 121,971  
Computer Equipment and Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 48,237 48,917  
Office equipment, furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 17,893 16,393  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 19,234 $ 19,591