Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income	$ 517,198	$ 515,246
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	202,348	198,148
Gain on disposition of assets	(3,881)	(1,033)
Loss (gain) on sale of marketable securities, net	(782)	2
Gain on foreign currency forward exchange contracts	(7,231)	(457)
Deferred tax provision	(15,623)	11,921
Accretion of discounts on marketable securities	(231)	(200)
Amortization of debt issuance costs	439	449
Amortization of debt discounts	114	167
Stock-based compensation expense	2,920	3,719
Deferred income, net	(32,490)	56,593
Deferred expenses, net	54,789	(52,311)
Other assets, noncurrent	(217)	5,788
Other liabilities, noncurrent	424	7,712
Proceeds from settlement of foreign currency forward exchange contracts designated as accounting hedges	7,231	457
Changes in operating assets and liabilities:
Accounts receivable	51,147	109,118
Prepaid expenses and other current assets	(24,137)	(20,045)
Accounts payable and accrued liabilities	(33,070)	8,666
Taxes payable	4,691	(149,635)
Net cash provided by operating activities	723,639	694,305
Investing activities:
Capital expenditures	(100,521)	(221,890)
Deposits for construction of new rigs	(478,320)
Deposits received on sale of rig		18,600
Proceeds from disposition of assets, net of disposal costs	4,205	1,258
Proceeds from sale and maturities of marketable securities	3,312,089	2,550,088
Purchases of marketable securities	(3,399,797)	(2,399,760)
Net cash used in investing activities	(662,344)	(51,704)
Financing activities:
Redemption of zero coupon debentures		(4,238)
Debt issuance costs and arrangement fees		(98)
Payment of dividends	(245,812)	(489,670)
Proceeds from stock plan exercises		107
Net cash used in financing activities	(245,812)	(493,899)
Net change in cash and cash equivalents	(184,517)	148,702
Cash and cash equivalents, beginning of period	464,393	376,417
Cash and cash equivalents, end of period	$ 279,876	$ 525,119

Increase in carrying value of investments in marketable securities purchased at a discount from face value. This amount represents the portion recognized in earnings during the period as interest income.

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The amount of deferred or unearned revenue received during the period, net of amortization of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to the receipt and amortization thereof of deferred mobilization and capital modification fees paid to the reporting entity.

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Deposits received on sale of rig.

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Other Liabilities, noncurrent.

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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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The increase (decrease) during the reporting period in cash and cash equivalents. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss).

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The net cash inflow or outflow from financing activity for the period.

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The net cash inflow or outflow from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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