Drilling and Other Property and Equipment (Tables)

3 Months Ended

Mar. 31, 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):

	March 31,			December 31,
	2019			2018
Drilling rigs and equipment	$	8,149,585		$	8,210,824
Land and buildings		63,916			63,757
Office equipment and other		92,095			91,819
Cost		8,305,596			8,366,400
Less: accumulated depreciation		(3,134,738	)		(3,182,178	)
Drilling and other property and equipment, net	$	5,170,858		$	5,184,222