Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant And Equipment [Abstract]

Summary Of Property, Plant And Equipment

	December 31,
	2020		2019
Machinery and equipment	$	2,228,539	$	2,425,526
Buildings, improvements and leasehold improvements		227,828		255,719
Automobiles, trucks, tractors and trailers		12,395		22,727
Furniture and fixtures		34,246		40,694
Construction-in-progress		4,793		16,661
Land		53,952		48,534
Oil and gas producing assets		15,117		69,204
Total		2,576,870		2,879,065
Accumulated depreciation and depletion		(2,034,780)		(2,214,116)
Property, plant and equipment, net	$	542,090	$	664,949