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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
OPERATING ACTIVITIES |  |  |
Net income (loss) |  | $ 40,893 | $ (195,872)
Adjustments to reconcile net loss to net cash provided by continuing operations activities: |  |  |
Income from discontinued operations |  | (752) | (708)
Depreciation, depletion and amortization |  | 471,146 | 541,388
Impairment of assets |  |  | 95,088
Amortization of deferred major repair costs |  |  | 3,798
Dry hole costs |  | 1,904 | 14,270
Amortization of undeveloped leases |  | 20,306 | 25,419
Accretion of asset retirement obligations |  | 20,984 | 24,471
Deferred income tax expense (benefit) |  | 33,130 | (316,201)
Pretax gains from disposition of assets |  | (130,648) | (3,831)
Net (increase) decrease in noncash operating working capital |  | 42,581 | (86,793)
Other operating activities, net |  | 91,918 | 12,349
Net cash provided by continuing operations activities |  | 591,462 | 113,378
Investing Activities |  |  |
Property additions and dry hole costs |  | (431,654) | (604,587)
Proceeds from sales of property, plant and equipment |  | 64,303 | 1,153,325
Purchases of investment securities | [1] | (212,661) | (651,218)
Proceeds from maturity of investment securities | [1] | 284,193 | 701,378
Other investing activities, net |  |  | (7,640)
Net cash (required) provided by investing activities |  | (295,819) | 591,258
Financing Activities |  |  |
Repayments of debt |  |  | (600,000)
Capital lease obligation payments |  | (11,983) | (5,172)
Withholding tax on stock-based incentive awards |  | (7,081) | (1,138)
Cash dividends paid |  | (86,278) | (120,535)
Net cash required by financing activities |  | (105,342) | (726,845)
Cash Flows from Discontinued Operations |  |  |
Operating activities |  |  | 5,185
Changes in cash included in current assets held for sale |  |  | (5,185)
Net change in cash and cash equivalents of discontinued operations |  |  |
Effect of exchange rate changes on cash and cash equivalents |  | (4,611) | 6,509
Net increase in cash and cash equivalents |  | 185,690 | (15,700)
Cash and cash equivalents at beginning of period |  | 872,797 | 283,183
Cash and cash equivalents at end of period |  | $ 1,058,487 | $ 267,483
[1] | Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.

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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 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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