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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  | $ 1,253,302,000 | $ 419,486,000 | [1],[2] | $ (311,789,000) | [1],[2]
Adjustments to reconcile net income (loss) to net cash provided by continuing operations activities: |  |  |  |  |  |
(Income) loss from discontinued operations |  | (1,064,487,000) | (250,348,000) | [1],[2] | (241,226,000) | [1],[2]
Depreciation, depletion and amortization |  | 1,147,842,000 | 775,614,000 | [1],[2] | 751,878,000 | [1],[2]
Previously suspended exploration costs (credits) |  | 12,840,000 | 20,508,000 | [2] | (4,861,000) | [2]
Amortization of undeveloped leases |  | 27,973,000 | 40,177,000 | [2] | 61,775,000 | [2]
Accretion of asset retirement obligations |  | 40,506,000 | 27,119,000 | [1],[2] | 25,282,000 | [1],[2]
Impairment of assets |  | 0 | 20,000,000 | [1],[2] | 0 | [1],[2]
Deferred income tax charge (benefit) |  | 28,530,000 | (177,627,000) | [2] | 270,072,000 | [2]
Pretax (gain) loss from sale of assets |  | (227,000) | (54,000) | [2] | (127,434,000) | [2]
Mark to market loss (gain) on contingent consideration |  | 8,672,000 | (4,810,000) | [2] | 0 | [2]
Mark to market loss (gain) on crude contracts |  | 33,364,000 | (33,954,000) | [2] | (13,748,000) | [2]
Long-term non-cash compensation |  | 76,958,000 | 72,151,000 | [2] | 44,119,000 | [2]
Net (increase) decrease in noncash operating working capital |  | (16,887,000) | (16,103,000) | [2] | 78,846,000 | [2]
Other operating activities, net |  | (59,281,000) | (142,764,000) | [2] | 80,437,000 | [2]
Net cash provided by continuing operations activities |  | 1,489,105,000 | 749,395,000 | [2] | 613,351,000 | [2]
Investing Activities |  |  |  |  |  |
Acquisition of oil and natural gas properties |  | (1,212,315,000) | (794,623,000) | [2] | 0 | [2]
Property additions and dry hole costs |  | (1,344,271,000) | (1,011,292,000) | [2] | (910,030,000) | [2]
Proceeds from sales of property, plant and equipment |  | 20,382,000 | 1,175,000 | [2] | 69,506,000 | [2]
Purchase of investment securities |  | 0 | 0 | [2] | (212,661,000) | [2]
Proceeds from maturity of investment securities |  | 0 | 0 | [2] | 320,828,000 | [2]
Net cash required by investing activities |  | (2,536,204,000) | (1,804,740,000) | [2] | (732,357,000) | [2]
Financing Activities |  |  |  |  |  |
Borrowings on revolving credit facility and term loan |  | 1,725,000,000 | 325,000,000 | [2] | 0 | [2]
Repayment of revolving credit facility and term loan |  | (2,050,000,000) | 0 | [2] | 0 | [2]
Debt issuance, net of cost |  | 542,394,000 | 0 | [2] | 541,597,000 | [2]
Early retirement of debt |  | (521,332,000) | 0 | [2] | (550,000,000) | [2]
Loss on early extinguishment of debt |  | (26,626,000) | 0 | [2] | 0 | [2]
Repurchase of common stock |  | (499,924,000) | 0 | [2] | 0 | [2]
Capital lease obligation payments |  | (688,000) | (318,000) | [2] | 0 | [2]
Withholding tax on stock-based incentive awards |  | (6,991,000) | (8,076,000) | [2] | (7,116,000) | [2]
Distributions to noncontrolling interest |  | (128,158,000) | 0 | [2] | 0 | [2]
Cash dividends paid |  | (163,669,000) | (173,044,000) | [2] | (172,565,000) | [2]
Net cash (required) provided by financing activities |  | (1,129,994,000) | 143,562,000 | [2] | (188,084,000) | [2]
Cash Flows from Discontinued Operations |  |  |  |  |  |
Operating activities | [3] | 73,783,000 | 406,857,000 | [2] | 527,228,000 | [2]
Investing activities | [3] | 2,022,034,000 | (91,398,000) | [2] | (99,637,000) | [2]
Financing activities | [3] | (4,914,000) | (9,432,000) | [2] | (17,133,000) | [2]
Net cash provided by discontinued operations | [3] | 2,090,903,000 | 306,027,000 | [2] | 410,458,000 | [2]
Cash transferred from discontinued operations to continuing operations |  | 2,120,397,000 | 612,543,000 | [2] | 325,446,000 | [2]
Effect of exchange rate changes on cash and cash equivalents |  | 3,533,000 | 28,730,000 | [2] | 1,327,000 | [2]
Net increase (decrease) in cash and cash equivalents |  | (53,163,000) | (270,510,000) | [2] | 19,683,000 | [2]
Cash and cash equivalents at beginning of period | [2] | 359,923,000 | 630,433,000 |  | 610,750,000 |
Cash and cash equivalents at end of period |  | $ 306,760,000 | $ 359,923,000 | [2] | $ 630,433,000 | [2]
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.
[2] | Reclassified to conform with current presentation (see Note E)
[3] | Net cash provided by discontinued operations are not part of the cash flow reconciliation.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell mineral resources, energy, and agricultural products at some future point held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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