Drilling and Other Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2019

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 (in thousands):

	September 30,			December 31,
	2019			2018
Drilling rigs and equipment	$	7,911,380		$	8,210,824
Land and buildings		64,102			63,757
Office equipment and other		91,952			91,819
Cost		8,067,434			8,366,400
Less: accumulated depreciation		(2,916,558	)		(3,182,178	)
Drilling and other property and equipment, net	$	5,150,876		$	5,184,222