Property, Plant And Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment

(5) Property, Plant and Equipment

A summary of property, plant and equipment is as follows (in thousands):

	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

The Company had $28.9 million and $68.4 million of leasehold improvements at December 31, 2020 and 2019, respectively. These leasehold improvements are depreciated over the shorter of the life of the asset or the term of the lease using the straight line method. Depreciation expense (excluding depletion, amortization and accretion) was $133.6 million, $180.2 million and $258.6 million during 2020, 2019 and 2018, respectively.