Acquisitions and Divestitures (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed	$ 5,000
Accounts Receivable, Net	83,540
Inventories	10,955
Other	10,640
Total Current Assets	175,546
Oil and Gas Properties (Successful Efforts Method)	3,850,100
Other Property, Plant and Equipment	16,586
Total Property, Plant and Equipment, Net	3,866,686
Other Assets	22,706
Total Assets	4,064,938
Accounts Payable	126,988
Accrued Taxes Payable	23,520
Other	743
Total Current Liabilities	151,251
Long-Term Debt	163,829
Asset Retirement Obligations	163,144
Off-Market Transportation Contracts	39,720
Other Liabilities	28,645
Deferred Income Taxes	1,104,581
Total Liabilities	1,651,170
Total Consideration Transferred	2,413,768
Gains (Losses) on Asset Dispositions, Net	205,835	$ (8,798)	$ 507,590
Proceeds from Sale of Producing Properties	$ 1,119,215	192,807	569,332
Stock Issued During Period, Shares, Acquisitions	25
Payments to Acquire Businesses, Gross	$ 16,000
Aggregated Purchase Price to Acquire Proved Crude Oil Properties and Related Assets		$ 481,000
Cumulative translation adjustments	383,000
Restricted cash related to future abandonment liabilities			$ 150,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,400,000
Cash Acquired from Acquisition	70,411
Revenue [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Separately Recognized Transactions, Revenues and Gains Recognized	71,000
Operating Income [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized	$ 8,000

Cost incurred to acquire certain proved crude oil properties and related assets

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Taxes Payable

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Asset Retirement Obligations

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Off-Market Transportation Contracts

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Oil and Gas Properties (Successful Efforts Method)

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Property, Plant And Equipment

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Cumulative translation adjustments previously recorded in Accumulated Other Comprehensive Income on the Balance Sheet

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Restricted cash related to future abandonment liabilities

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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The amount of inventory recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Number of shares of stock issued during the period pursuant to acquisitions.

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