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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Operating Activities |  |  |  |
Net loss |  | $ (25,000) | $ (212,048) |
Adjustments to reconcile net loss to net cash provided by continuing operations activities: |  |  |  |
(Income) loss from discontinued operations |  | (1,177) | 885 |
Depreciation, depletion and amortization |  | 714,782 | 797,288 |
Impairment of assets |  |  | 95,088 |
Amortization of deferred major repair costs |  |  | 3,794 |
Dry hole costs (credits) |  | (1,139) | 15,226 |
Amortization of undeveloped leases |  | 40,859 | 35,828 |
Accretion of asset retirement obligations |  | 31,638 | 35,514 |
Deferred and noncurrent income tax benefit |  | (3,567) | (345,157) |
Pretax gains from disposition of assets |  | (130,765) | (3,101) |
Net (increase) decrease in noncash operating working capital |  | 1,070 | (152,618) | [1]
Other operating activities, net |  | 192,867 | 9,651 |
Net cash provided by continuing operations activities |  | 819,568 | 280,350 |
Investing Activities |  |  |  |
Property additions and dry hole costs |  | (706,417) | (781,668) | [2]
Proceeds from sales of property, plant and equipment |  | 69,146 | 1,154,623 |
Purchases of investment securities | [3] | (212,661) | (651,218) |
Proceeds from maturity of investment securities | [3] | 320,828 | 712,863 |
Other investing activities, net |  |  | (7,229) |
Net cash (required) provided by investing activities |  | (529,104) | 427,371 |
Financing Activities |  |  |  |
Borrowings of debt |  | 541,772 | 541,444 |
Repayments of debt |  | (550,000) | (600,000) |
Capital lease obligation payments |  | (14,687) | (7,808) |
Withholding tax on stock-based incentive awards |  | (7,151) | (1,138) |
Issue cost of debt facility |  |  | (13,971) |
Cash dividends paid |  | (129,421) | (163,586) |
Other financing activities, net |  |  | (20) |
Net cash required by financing activities |  | (159,487) | (245,079) |
Cash Flows from Discontinued Operations |  |  |  |
Operating activities |  | 12,134 | 2,830 |
Changes in cash included in current assets held for sale |  | (12,904) | (2,830) |
Net change in cash and cash equivalents of discontinued operations |  | (770) |  |
Effect of exchange rate changes on cash and cash equivalents |  | (5,797) | 7,268 |
Net increase in cash and cash equivalents |  | 124,410 | 469,910 |
Cash and cash equivalents at beginning of period |  | 872,797 | 283,183 |
Cash and cash equivalents at end of period |  | $ 997,207 | $ 753,093 |
[1] | 2016 balance includes payments for deepwater rig contract exit of $266.6 million.
[2] | Includes costs of $206.7 million associated with acquisition of Kaybob Duvernay and Placid Montney.
[3] | Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Dry hole costs from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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