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Property, plant and equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Land and improvements   $ 42,654 $ 42,654
Buildings and improvements   330,254 325,580
Machinery and equipment   1,374,551 1,349,731
Construction in progress   21,106 173,418
Property, plant and equipment, gross   1,768,565 1,891,383
Less accumulated depreciation   (742,280) (659,127)
Property, plant and equipment - net $ 1,012,564 $ 1,026,285 $ 1,232,256