Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment

Major Components of Property, Plant and Equipment

	December 31,
	2020		2019
	(In thousands)
Land	$	28,261	$	33,931
Buildings		141,365		132,603
Drilling rigs and related equipment		12,487,961		12,948,504
Oilfield hauling and mobile equipment		259,150		270,826
Other machinery and equipment		195,903		192,081
Oil and gas properties		—		12,286
Construction-in-process (1)		—		25,391
	$	13,112,640	$	13,615,622
Less: accumulated depreciation and amortization		(9,126,933)		(8,685,073)
	$	3,985,707	$	4,930,549

(1) Relates primarily to amounts capitalized for new or substantially new drilling rigs and related equipment that were under construction and had not yet been placed in service as of December 31, 2019.