Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net income	$ 564,816	$ 774,052
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	300,069	303,523
Gain on disposition of assets	(79,285)	(4,344)
Loss (gain) on foreign currency forward exchange contracts	5,692	(9,593)
Deferred tax provision	(6,089)	(15,798)
Accretion of discounts on marketable securities	4,461	(39)
Stock-based compensation expense	3,248	3,749
Deferred income, net	(19,020)	(46,127)
Deferred expenses, net	58,391	62,836
Other assets, noncurrent	2,697	(165)
Other liabilities, noncurrent	7,029	964
(Payments of) proceeds from settlement of foreign currency forward exchange contracts designated as accounting hedges	(5,692)	9,593
Other	800	51
Changes in operating assets and liabilities:
Accounts receivable	108,159	20,055
Prepaid expenses and other current assets	(9,350)	(20,137)
Accounts payable and accrued liabilities	4,961	(43,845)
Taxes payable	68,711	44,368
Net cash provided by operating activities	1,009,598	1,079,143
Investing activities:
Capital expenditures (including rig construction)	(514,672)	(643,305)
Proceeds from disposition of assets, net of disposal costs	136,937	5,128
Proceeds from sale and maturities of marketable securities	2,075,106	4,862,108
Purchases of marketable securities	(2,352,635)	(5,051,538)
Net cash used in investing activities	(655,264)	(827,607)
Financing activities:
Payment of dividends	(367,984)	(367,930)
Credit facility arrangement fees	(3,646)
Other	130	4
Net cash used in financing activities	(371,500)	(367,926)
Net change in cash and cash equivalents	(17,166)	(116,390)
Cash and cash equivalents, beginning of period	333,765	464,393
Cash and cash equivalents, end of period	$ 316,599	$ 348,003