Drilling and Other Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

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:

	December 31,
	2012			2011
	(In thousands)
Drilling rigs and equipment	$	7,107,279		$	7,431,713
Construction work-in-progress		990,964			504,805
Land and buildings		64,296			60,926
Office equipment and other		60,239			49,035
Cost		8,222,778			8,046,479
Less accumulated depreciation		(3,357,806	)		(3,379,010)
Drilling and other property and equipment, net	$	4,864,972		$	4,667,469