Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Contract drilling	$ 714,027	$ 861,511	$ 2,195,443	$ 2,520,030
Revenues related to reimbursable expenses	15,114	16,666	40,528	54,032
Total revenues	729,141	878,177	2,235,971	2,574,062
Operating expenses:
Contract drilling, excluding depreciation	357,281	391,369	1,159,635	1,141,739
Reimbursable expenses	14,563	16,206	39,351	52,443
Depreciation	99,207	101,175	300,069	303,523
General and administrative	13,476	14,879	49,803	48,976
Bad debt expense (recovery)		4,734	(1,018)	(5,413)
Gain on disposition of assets	(208)	(463)	(79,285)	(4,344)
Total operating expenses	484,319	527,900	1,468,555	1,536,924
Operating income	244,822	350,277	767,416	1,037,138
Other income (expense):
Interest income	773	2,024	4,052	3,565
Interest expense	(8,720)	(15,874)	(36,780)	(60,144)
Foreign currency transaction gain (loss)	(1,860)	(1,442)	(881)	(4,603)
Other, net	(168)	(136)	(767)	(232)
Income before income tax expense	234,847	334,849	733,040	975,724
Income tax expense	(56,661)	(77,995)	(168,224)	(201,672)
Net income	$ 178,186	$ 256,854	$ 564,816	$ 774,052
Income per share:
Basic	$ 1.28	$ 1.85	$ 4.06	$ 5.57
Diluted	$ 1.28	$ 1.85	$ 4.06	$ 5.57
Weighted-average shares outstanding:
Shares of common stock	139,030	139,027	139,029	139,027
Dilutive potential shares of common stock	23	14	17	21
Total weighted-average shares outstanding	139,053	139,041	139,046	139,048
Cash dividends declared per share of common stock	$ 0.875	$ 0.875	$ 2.625	$ 2.625