Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property, plant and equipment consists of the following:

	June 30, 2018			December 31, 2017
Land and improvements	$	72,192		$	73,419
Buildings and improvements	306,287			305,231
Machinery and equipment	1,065,390			1,022,279
Construction in progress	215,191			198,358
	1,659,060			1,599,287
Accumulated depreciation	(692,747		)	(647,109		)
Property, plant and equipment, net	$	966,313		$	952,178