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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities |  |  |  |  |  |
Net loss |  | $ (311,789,000) | $ (275,970,000) | [1] | $ (2,270,833,000) | [1]
Adjustments to reconcile net loss to net cash provided by continuing operations activities: |  |  |  |  |  |
Loss from discontinued operations |  | 853,000 | 2,027,000 | [1] | 15,061,000 | [1]
Depreciation, depletion and amortization |  | 957,719,000 | 1,054,081,000 | [1] | 1,619,824,000 | [1]
Impairment of assets |  | 0 | 95,088,000 | [1] | 2,493,156,000 | [1]
Amortization of deferred major repair costs |  |  | 3,794,000 |  | 7,296,000 |
Dry hole costs (credits) |  | (4,163,000) | 15,047,000 |  | 296,845,000 |
Amortization of undeveloped leases |  | 61,776,000 | 43,417,000 |  | 75,312,000 |
Accretion of asset retirement obligations |  | 42,590,000 | 46,742,000 | [1] | 48,665,000 | [1]
Deferred income tax expense (benefit) |  | 260,420,000 | (387,843,000) |  | (978,030,000) |
Pretax gains from disposition of assets |  | (127,434,000) | (1,663,000) | [1] | (154,155,000) | [1]
Net (increase) decrease in noncash operating working capital |  | 136,414,000 | (38,689,000) |  | 35,064,000 |
Other operating activities, net |  | 113,289,000 | 44,764,000 |  | (4,836,000) |
Net cash provided by continuing operations activities |  | 1,129,675,000 | 600,795,000 |  | 1,183,369,000 |
Investing Activities |  |  |  |  |  |
Property additions and dry hole costs |  | (1,009,667,000) | (926,948,000) |  | (2,549,736,000) |
Proceeds from sales of property, plant and equipment |  | 69,506,000 | 1,155,144,000 |  | 423,911,000 |
Purchases of investment securities | [2] | (212,661,000) | (695,879,000) |  | (911,787,000) |
Proceeds from maturity of investment securities | [2] | 320,828,000 | 761,000,000 |  | 1,129,139,000 |
Other investing activities, net |  |  | (7,230,000) |  | (13,648,000) |
Net cash provided (required) by investing activities |  | (831,994,000) | 286,087,000 |  | (1,922,121,000) |
Financing Activities |  |  |  |  |  |
Borrowings of debt |  | 541,597,000 | 541,444,000 |  | 600,000,000 |
Repayments of debt |  | (550,000,000) | (600,000,000) |  | (450,000,000) |
Capital lease obligation payments |  | (17,133,000) | (10,447,000) |  | (10,434,000) |
Purchase of treasury stock |  |  |  |  | (250,000,000) |
Issue cost of debt facility |  |  | (14,085,000) |  |  |
Cash dividends paid |  | (172,565,000) | (206,635,000) |  | (244,998,000) |
Other financing activities, net |  | (7,116,000) | (1,158,000) |  | (9,129,000) |
Net cash required by financing activities |  | (205,217,000) | (290,881,000) |  | (364,561,000) |
Cash Flows from Discontinued Operations |  |  |  |  |  |
Operating activities |  | 10,905,000 |  |  | (15,005,000) |
Investing activities |  |  |  |  | 5,314,000 |
Changes in cash included in current assets held for sale |  | (12,505,000) |  |  | 192,585,000 |
Net increase (decrease) in cash and cash equivalents of discontinued operations |  | (1,600,000) |  |  | 182,894,000 |
Effect of exchange rate changes on cash and cash equivalents |  | 1,327,000 | (6,387,000) |  | 10,294,000 |
Net increase (decrease) in cash and cash equivalents |  | 92,191,000 | 589,614,000 |  | (910,125,000) |
Cash and cash equivalents at beginning of period |  | 872,797,000 | 283,183,000 |  | 1,193,308,000 |
Cash and cash equivalents at end of period |  | $ 964,988,000 | $ 872,797,000 |  | $ 283,183,000 |
[1] | Reclassified to conform to current presentation (see Note A).
[2] | Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.

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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 Amount of cash (inflow) outflow from investing 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 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: 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 + Details
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- Definition The cash outflow to reacquire common stock 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 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + 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 (e) -URI http://asc.fasb.org/extlink&oid=98514028&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://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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