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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Operating Activities |  |  |
Net (loss) including noncontrolling interest |  | $ (293,864) | $ (833,102)
Adjustments to reconcile net loss to net cash provided (required) by continuing operations activities |  |  |
Loss (income) from discontinued operations |  | (106) | 6,129
Depreciation, depletion and amortization |  | 425,566 | 537,548
Previously suspended exploration costs |  | 633 | 7,677
Amortization of undeveloped leases |  | 8,882 | 14,770
Accretion of asset retirement obligations |  | 22,656 | 20,435
Impairment of assets |  | 171,296 | 987,146
Noncash restructuring expense |  | 0 | 17,565
Deferred income tax benefit |  | (101,195) | (167,902)
Mark to market loss (gain) on contingent consideration |  | 76,677 | (43,529)
Mark to market loss (gain) on crude contracts |  | 284,360 | (173,848)
Long-term non-cash compensation |  | 25,318 | 22,760
Net (increase) decrease in noncash working capital |  | 26,565 | 1,335
Other operating activities, net |  | 39,494 | (27,605)
Net cash provided by continuing operations activities |  | 686,282 | 369,379
Investing Activities |  |  |
Property additions and dry hole costs |  | (445,314) | (537,601)
Property additions for King's Quay FPS |  | (17,734) | (51,635)
Proceeds from sales of property, plant and equipment |  | 269,363 | 0
Net cash (required) by investing activities |  | (193,685) | (589,236)
Financing Activities |  |  |
Borrowings on revolving credit facility |  | 165,000 | 370,000
Repayment of revolving credit facility |  | (365,000) | (200,000)
Retirement of debt |  | (576,358) | (12,225)
Debt issuance, net of cost |  | 541,974 | (613)
Early redemption of debt cost |  | (34,177) | 0
Distributions to noncontrolling interest |  | (75,238) | (32,400)
Cash dividends paid |  | (38,590) | (57,590)
Withholding tax on stock-based incentive awards |  | (3,895) | (7,247)
Proceeds from term loan and other loans |  | 0 | 371
Capital lease obligation payments |  | (371) | (336)
Net cash (required) provided by financing activities |  | (386,655) | 59,960
Cash Flows from Discontinued Operations |  |  |
Operating activities | [1] | 0 | (1,202)
Investing activities | [1] | 0 | 4,494
Financing activities | [1] | 0 | 0
Net cash provided by discontinued operations | [1] | 0 | 3,292
Effect of exchange rate changes on cash and cash equivalents |  | 1,552 | (1,358)
Net increase (decrease) in cash and cash equivalents |  | 107,494 | (161,255)
Cash and cash equivalents at beginning of period |  | 310,606 | 306,760
Cash and cash equivalents at end of period |  | $ 418,100 | $ 145,505
[1] | Net cash provided by discontinued operations is not part of the cash flow reconciliation. See Notes to Consolidated Financial Statements, page 7.

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