Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Summary of property, plant and equipment

Details of the Company's property, plant and equipment at December 31 are as follows:

	2019		2018
Land	$	114,443	$	110,698
Timber resources	42,338		41,862
Buildings	560,334		535,433
Machinery and equipment	3,077,500		2,977,156
Construction in progress	143,021		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