Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment

Major Components of Property, Plant and Equipment

	December 31,
	2019		2018
	(In thousands)
Land	$	33,931	$	43,187
Buildings		132,603		123,619
Drilling rigs and related equipment		12,948,504		13,021,580
Oilfield hauling and mobile equipment		270,826		267,223
Other machinery and equipment		192,081		197,094
Oil and gas properties		12,286		12,286
Construction-in-process (1)		25,391		30,395
	$	13,615,622	$	13,695,384
Less: accumulated depreciation and amortization		(8,685,073)		(8,227,514)
	$	4,930,549	$	5,467,870

(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 or 2018.