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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [1]
Operating Activities |  |  |  |  |
Net income (loss) including noncontrolling interest |  | $ (1,262,445) | $ 1,253,302 |  | $ 419,486
Adjustments to reconcile net income (loss) to net cash provided by continuing operations activities: |  |  |  |  |
(Income) loss from discontinued operations |  | 7,151 | (1,064,487) |  | (250,348)
Depreciation, depletion and amortization |  | 987,239 | 1,147,842 |  | 775,614
Previously suspended exploration costs |  | 21,099 | 12,840 |  | 20,508
Amortization of undeveloped leases |  | 26,743 | 27,973 |  | 40,177
Accretion of asset retirement obligations |  | 42,136 | 40,506 |  | 27,119
Impairment of assets |  | 1,206,284 | 0 |  | 20,000
Noncash restructuring expense |  | 17,565 | 0 |  | 0
Deferred income tax charge (benefit) |  | (278,042) | 28,530 |  | (177,627)
Mark to market loss (gain) on contingent consideration |  | (13,783) | 8,672 |  | (4,810)
Mark to market loss (gain) on crude contracts |  | 69,310 | 33,364 |  | (33,954)
Long-term non-cash compensation |  | 46,558 | 76,958 |  | 72,151
Net (increase) decrease in noncash operating working capital |  | (32,027) | (16,887) |  | (16,103)
Other operating activities, net |  | (35,080) | (59,508) |  | (142,818)
Net cash provided by continuing operations activities |  | 802,708 | 1,489,105 |  | 749,395
Investing Activities |  |  |  |  |
Property additions and dry hole costs |  | (759,809) | (1,244,069) |  | (1,011,292)
Property additions for King's Quay FPS |  | (112,961) | (100,202) |  | 0
Proceeds from sales of property, plant and equipment |  | 13,750 | 20,382 |  | 1,175
Acquisition of oil and natural gas properties |  | 0 | (1,212,315) |  | (794,623)
Net cash required by investing activities |  | (859,020) | (2,536,204) |  | (1,804,740)
Financing Activities |  |  |  |  |
Borrowings on revolving credit facility and term loan |  | 450,000 | 1,725,000 |  | 325,000
Repayment of revolving credit facility and term loan |  | (250,000) | (2,050,000) |  | 0
Cash dividends paid |  | (95,989) | (163,669) |  | (173,044)
Distributions to noncontrolling interest |  | (43,673) | (128,158) |  | 0
Early retirement of debt |  | (12,225) | (521,332) |  | 0
Withholding tax on stock-based incentive awards |  | (7,094) | (6,991) |  | (8,076)
Debt issuance, net of cost |  | (613) | 542,394 |  | 0
Capital lease obligation payments |  | (695) | (688) |  | (318)
Loss on early extinguishment of debt |  | 0 | (26,626) |  | 0
Repurchase of common stock |  | 0 | (499,924) |  | 0
Net cash (required) provided by financing activities |  | 39,711 | (1,129,994) |  | 143,562
Cash Flows from Discontinued Operations |  |  |  |  |
Operating activities | [2] | (1,202) | 73,783 |  | 406,857
Investing activities | [2] | 4,494 | 2,022,034 |  | (91,398)
Financing activities | [2] | 0 | (4,914) |  | (9,432)
Net cash provided by discontinued operations | [2] | 3,292 | 2,090,903 |  | 306,027
Cash from discontinued operations | [2] | 18,438 | 2,120,397 |  | 612,543
Effect of exchange rate changes on cash and cash equivalents |  | 2,009 | 3,533 |  | 28,730
Net increase (decrease) in cash and cash equivalents |  | 3,846 | (53,163) |  | (270,510)
Cash and cash equivalents at beginning of period |  | 306,760 | 359,923 | [1] | 630,433
Cash and cash equivalents at end of period |  | $ 310,606 | $ 306,760 |  | $ 359,923
[1] | Reclassified to conform with current presentation
[2] | Net cash provided by discontinued operations are not part of the cash flow reconciliation.

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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=118932676&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=118932676&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=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow to purchase long lived physical asset use for 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=118932676&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=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other. + 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=118932676&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=118932676&loc=d3e3291-108585 + 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=118932676&loc=d3e3255-108585 + 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=118932676&loc=d3e3179-108585 + Details
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