Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant And Equipment [Abstract]

Summary Of Property, Plant And Equipment

	December 31,
	2019		2018
Machinery and equipment	$	2,425,526	$	3,229,793
Buildings, improvements and leasehold improvements		255,719		278,339
Automobiles, trucks, tractors and trailers		22,727		26,522
Furniture and fixtures		40,694		52,045
Construction-in-progress		16,661		38,119
Land		48,534		58,047
Oil and gas producing assets		69,204		66,605
Total		2,879,065		3,749,470
Accumulated depreciation and depletion		(2,214,116)		(2,640,344)
Property, plant and equipment, net	$	664,949	$	1,109,126