Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Contract drilling	$ 690,741	$ 714,027	$ 2,135,612	$ 2,195,443
Revenues related to reimbursable expenses	15,424	15,114	58,312	40,528
Total revenues	706,165	729,141	2,193,924	2,235,971
Operating expenses:
Contract drilling, excluding depreciation	419,488	357,281	1,163,618	1,159,635
Reimbursable expenses	14,904	14,563	56,998	39,351
Depreciation	97,143	99,207	291,107	300,069
General and administrative	15,240	13,476	48,490	49,803
Bad debt expense (recovery)	22,563		22,563	(1,018)
Gain on disposition of assets	(525)	(208)	(2,789)	(79,285)
Total operating expenses	568,813	484,319	1,579,987	1,468,555
Operating income	137,352	244,822	613,937	767,416
Other income (expense):
Interest income	136	773	1,024	4,052
Interest expense	(1,693)	(8,720)	(17,713)	(36,780)
Foreign currency transaction loss	(4,556)	(1,860)	(3,949)	(881)
Other, net	326	(168)	746	(767)
Income before income tax expense	131,565	234,847	594,045	733,040
Income tax expense	(36,817)	(56,661)	(137,974)	(168,224)
Net income	$ 94,748	$ 178,186	$ 456,071	$ 564,816
Income per share:
Basic	$ 0.68	$ 1.28	$ 3.28	$ 4.06
Diluted	$ 0.68	$ 1.28	$ 3.28	$ 4.06
Weighted-average shares outstanding:
Shares of common stock	139,035	139,030	139,034	139,029
Dilutive potential shares of common stock	30	23	38	17
Total weighted-average shares outstanding	139,065	139,053	139,072	139,046
Cash dividends declared per share of common stock	$ 0.875	$ 0.875	$ 2.625	$ 2.625