Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Contract drilling	$ 869,646	$ 811,739	$ 1,658,519	$ 1,656,177
Revenues related to reimbursable expenses	19,850	10,864	37,366	26,107
Total revenues	889,496	822,603	1,695,885	1,682,284
Operating expenses:
Contract drilling, excluding depreciation	388,006	351,769	750,370	657,996
Reimbursable expenses	19,287	10,379	36,237	25,084
Depreciation	101,175	100,746	202,348	198,148
General and administrative	16,372	16,849	34,097	33,503
Bad debt recovery	(1,700)	(2,798)	(10,147)	(3,898)
Gain on disposition of assets	(1,240)	(149)	(3,881)	(1,033)
Total operating expenses	521,900	476,796	1,009,024	909,800
Operating income	367,596	345,807	686,861	772,484
Other income (expense):
Interest income	1,091	477	1,541	1,759
Interest expense	(22,226)	(21,333)	(44,270)	(43,654)
Foreign currency transaction gain (loss)	(1,555)	(3,991)	(3,161)	(3,530)
Other, net	(880)	(34)	(96)	(121)
Income before income tax expense	344,026	320,926	640,875	726,938
Income tax expense	(77,440)	(96,533)	(123,677)	(211,692)
Net income	$ 266,586	$ 224,393	$ 517,198	$ 515,246
Income per share:
Basic	$ 1.92	$ 1.61	$ 3.72	$ 3.71
Diluted	$ 1.92	$ 1.61	$ 3.72	$ 3.70
Weighted-average shares outstanding:
Shares of common stock	139,027	139,026	139,027	139,026
Dilutive potential shares of common stock	25	53	25	78
Total weighted-average shares outstanding	139,052	139,079	139,052	139,104
Cash dividends declared per share of common stock	$ 0.875	$ 1.50	$ 1.75	$ 3.50