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Property, plant and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land and improvements $ 42,654 $ 43,385
Buildings and improvements 325,580 345,271
Machinery and equipment 1,349,731 1,476,518
Construction in progress 173,418 182,393
Property, plant and equipment, gross 1,891,383 2,047,567
Less accumulated depreciation (659,127) (742,024)
Property, plant and equipment - net $ 1,232,256 $ 1,305,543