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Property, plant and equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, plant and equipment Property, plant and equipment
Details of the Company's property, plant and equipment at December 31 are as follows:
20192018
Land$114,443  $110,698  
Timber resources42,338  41,862  
Buildings560,334  535,433  
Machinery and equipment3,077,500  2,977,156  
Construction in progress143,021  159,661  
3,937,636  3,824,810  
Accumulated depreciation and depletion(2,650,794) (2,590,989) 
Property, plant and equipment, net$1,286,842  $1,233,821  
Estimated costs for completion of capital additions under construction totaled approximately $102,836 at December 31, 2019.
Depreciation and depletion expense amounted to $186,540 in 2019, $188,533 in 2018 and $178,049 in 2017.