Drilling and Other Property and Equipment

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Drilling and Other Property and Equipment

8. Drilling and Other Property and Equipment

Cost and accumulated depreciation of drilling and other property and equipment are summarized as follows (in thousands):

	March 31,			December 31,
	2020			2019
Drilling rigs and equipment	$	7,273,173		$	8,004,489
Land and buildings		64,342			64,267
Office equipment and other		92,965			92,289
Cost		7,430,480			8,161,045
Less: accumulated depreciation		(3,100,497	)		(3,008,217	)
Drilling and other property and equipment, net	$	4,329,983		$	5,152,828

During the three months ended March 31, 2020, we recorded an aggregate impairment charge of $774.0 million, to write down four of our drilling rigs with indicators of impairment to their estimated fair values. See Notes 4 and 7.