XML 52 R33.htm IDEA: XBRL DOCUMENT v3.8.0.1
Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of property, plant and equipment
Property, plant and equipment, at December 31, consist of the following:
 
2017
 
2016
Land and improvements
$
41,823

 
$
42,654

Buildings and improvements
331,735

 
330,254

Machinery and equipment
1,398,687

 
1,374,551

Construction in progress
22,517

 
21,106

 
1,794,762

 
1,768,565

Less accumulated depreciation
(822,846
)
 
(742,280
)
Property, plant and equipment - net
$
971,916

 
$
1,026,285