Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 638,589	$ 28,517
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	748,591	816,036
Impairments	64,609	193,187
Stock-Based Compensation Expenses	35,486	30,460
Deferred Income Taxes	171,362	694
Losses on Asset Dispositions, Net	(14,969)	(16,758)
Other, Net	2,013	(3,052)
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	59,771	(62,020)
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts	(21,965)	1,912
Other, Net	(478)	(428)
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(109,654)	28,688
Inventories	(106,799)	24,736
Accounts Payable	53,652	20,426
Accrued Taxes Payable	21,950	(38,613)
Other Assets	(8,863)	(44,677)
Other Liabilities	(29,055)	(51,251)
Changes in Components of Working Capital Associated with Investing and Financing Activities	17,988	(63,324)
Net Cash Provided by Operating Activities	1,552,166	898,049
Investing Cash Flows
Additions to Oil and Gas Properties	(1,365,111)	(912,227)
Additions to Other Property, Plant and Equipment	(76,100)	(34,336)
Proceeds from Sales of Assets	2,829	46,812
Changes in Components of Working Capital Associated with Investing Activities	(18,045)	63,324
Net Cash Used in Investing Activities	(1,456,427)	(836,427)
Financing Cash Flows
Dividends Paid	(97,026)	(96,707)
Treasury Stock Purchased	(16,776)	(18,628)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	1,453	2,356
Repayment of Capital Lease Obligation	(1,671)	(1,619)
Changes in Components of Working Capital Associated with Financing Activities	57	0
Net Cash Used in Financing Activities	(113,963)	(114,598)
Effect of Exchange Rate Changes on Cash	90	(353)
Decrease in Cash and Cash Equivalents	(18,134)	(53,329)
Cash and Cash Equivalents at Beginning of Period	834,228	1,599,895
Cash and Cash Equivalents at End of Period	$ 816,094	$ 1,546,566

The net change during the reporting period of all assets and liabilities used in financing activities.

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The cash inflows/outflows from operating activities not classfied elsewhere.

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This element reflects realized gain (loss) on the settlement of financial commodity derivative instruments.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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