Statements of Condensed Consolidated Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 210,009	$ 118,065
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, depletion and amortization	160,284	127,096
Deferred income taxes	103,938	66,431
Gain on disposition	(22,785)
Other income	(24,850)	(5,627)
Equity award expense	10,868	6,752
Provision for losses on accounts receivable	1,704	4,061
Unrealized (gains) losses on derivative financial instruments	(1,454)	822
Changes in operating assets and liabilities:
Inventory	28,358	38,918
Accounts receivable and unbilled revenues	59,144	70,680
Accounts payable	(27,076)	(53,527)
Derivative instruments at fair value, net	9,126	5,135
Federal income tax carryback refund		121,463
Other assets and liabilities	(44,682)	(23,690)
Net cash provided by operating activities	462,584	476,579
Cash flows from investing activities:
Additions to property, plant and equipment	(544,911)	(522,860)
Dividend from Nora Gathering, LLC	18,500
Proceeds from sale of available-for-sale securities	29,947
Proceeds from disposition	230,525
Investment in available-for-sale-securities		(750)
Net cash used in investing activities	(265,939)	(523,610)
Cash flows from financing activities:
Dividends paid	(65,795)	(61,589)
Proceeds from issuance of common stock		537,239
Decrease in short-term loans	(53,650)	(5,000)
Proceeds from exercises under employee compensation plans	2,025	1,982
Net cash (used in) provided by financing activities	(117,420)	472,632
Net increase in cash and cash equivalents	79,225	425,601
Cash and cash equivalents at beginning of period		0
Cash and cash equivalents at end of period	79,225	425,601
Cash paid (received) during the period for:
Interest, net of amount capitalized	64,703	68,214
Income taxes	$ 2,505	$ (124,266)

The cash received as a result of option exercises and the associated reductions in the entity's income taxes.

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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 should not be reported as cash and cash equivalents.

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The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

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