Drilling and Other Property and Equipment

6 Months Ended

Jun. 30, 2019

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):

	June 30,			December 31,
	2019			2018
Drilling rigs and equipment	$	8,228,429		$	8,210,824
Land and buildings		63,795			63,757
Office equipment and other		91,887			91,819
Cost		8,384,111			8,366,400
Less: accumulated depreciation		(3,220,415	)		(3,182,178	)
Drilling and other property and equipment, net	$	5,163,696		$	5,184,222

In April 2019, we sold the Ocean Guardian, a previously impaired semisubmersible rig, for a net pre-tax gain of $14.3 million. In addition, during the six months ended June 30, 2019, we disposed of certain other property and equipment and recognized an aggregate net pre-tax loss of $9.2 million.