Drilling and Other Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2011

Drilling and Other Property and Equipment [Abstract]

Summary of Cost and accumulated depreciation of drilling and other property and equipment

	September 30,			December 31,
	2011			2010
	(In thousands)
Drilling rigs and equipment	$	7,298,695		$	7,163,196
Construction work-in-progress		483,046			—
Land and buildings		60,449			56,536
Office equipment and other		47,622			44,689
Cost		7,889,812			7,264,421
Less: accumulated depreciation		(3,284,064	)		(2,980,629	)
Drilling and other property and equipment, net	$	4,605,748		$	4,283,792