Drilling and Other Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Summary of Cost and Accumulated Depreciation of Drilling and Other Property and Equipment

Cost and accumulated depreciation of drilling and other property and equipment are summarized as follows:

	September 30,			December 31,
	2017			2016
	(In thousands)
Drilling rigs and equipment	$	8,279,491		$	8,950,385
Land and buildings		63,309			64,449
Office equipment and other		78,909			73,108
Cost		8,421,709			9,087,942
Less: accumulated depreciation		(2,989,020	)		(3,361,007	)
Drilling and other property and equipment, net	$	5,432,689		$	5,726,935