Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and equipment consisted of the following at December 31, 2019 and 2018 (in thousands):

	2019			2018
Equipment	$	8,114,326		$	8,370,933
Oil and natural gas properties		226,646			219,855
Buildings		184,700			186,736
Land		25,747			26,144
Total property and equipment		8,551,419			8,803,668
Less accumulated depreciation, depletion and impairment		(5,244,742	)		(4,801,119	)
Property and equipment, net	$	3,306,677		$	4,002,549

Summary of Depreciation, Depletion, Amortization and Impairment Expense related to Property and Equipment and Intangible Assets and Liabilities

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment, intangible assets and liabilities for 2019, 2018 and 2017 (in thousands):

	2019		2018		2017
Depreciation and impairment expense	$	974,206	$	887,155	$	753,510
Amortization expense		17,722		18,197		21,764
Depletion expense		11,945		10,966		8,067
Total	$	1,003,873	$	916,318	$	783,341