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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Text Block]
7. Property, Plant and Equipment, net

The components of property, plant and equipment, net were as follows:
  December 31, 2018December 31, 2017
Land$53,623 $54,918 
Buildings and improvements529,982 517,049 
Machinery, equipment and other1,555,345 1,472,852 
Property, plant and equipment, gross2,138,950 2,044,819 
Total accumulated depreciation(1,332,453)(1,256,879)
Property, plant and equipment, net$806,497 $787,940 
Total depreciation expense was $138,712, $133,107 and $119,502 for the years ended December 31, 2018, 2017 and 2016, respectively.