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Financial Instruments and Risk Management (Tables) | 6 Months Ended
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Jun. 30, 2017
Financial Instruments and Risk Management [Abstract] |
Fair Value of Derivative Instruments Not Designated as Hedging Instruments |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  | June 30, 2017 |  | December 31, 2016
﻿(Thousands of dollars) |  | Asset (Liability) Derivatives |  | Asset (Liability) Derivatives
﻿Type of Derivative Contract |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
﻿Commodity |  | Accounts receivable |  | $ | 18,297 |  | Accounts payable |  | $ | (48,864)
﻿Foreign exchange |  | Accounts receivable |  |  | – |  | Accounts payable |  |  | (73)
﻿
Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  | Gain (Loss)
﻿ |  |  |  | Three Months Ended |  | Six Months Ended
﻿(Thousands of dollars) |  |  |  | June 30, |  | June 30,
﻿Type of Derivative Contract |  | Statement of Operations Location |  |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Commodity |  | Sales and other operating revenues |  | $ | 26,861 |  | (47,738) |  | 63,938 |  | (34,549)
﻿Foreign exchange |  | Interest and other income |  |  | (152) |  | 26,481 |  | 73 |  | 26,786
﻿ |  |  |  | $ | 26,709 |  | (21,257) |  | 64,011 |  | (7,763)
﻿
Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | June 30, 2017 |  | December 31, 2016
﻿(Thousands of dollars) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  |  | Level 2 |  | Level 3 |  | Total
﻿Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ Commodity derivative contracts |  | – |  | 18,297 |  | – |  | 18,297 |  | – |  |  | – |  | – |  | –
﻿ | $ | – |  | 18,297 |  | – |  | 18,297 |  | – |  |  | – |  | – |  | –
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ Nonqualified employee savings plans | $ | 14,652 |  | – |  | – |  | 14,652 |  | 13,904 |  |  | – |  | – |  | 13,904
﻿ Commodity derivative contracts |  | – |  | – |  | – |  | – |  | – |  |  | 48,864 |  | – |  | 48,864
﻿ Foreign currency exchange derivative contracts |  | – |  | – |  | – |  | – |  | – |  |  | 73 |  | – |  | 73
﻿ | $ | 14,652 |  | – |  | – |  | 14,652 |  | 13,904 |  |  | 48,937 |  | – |  | 62,841
﻿
Nonrecurring Fair Value Measurements |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  | June 30, 2016
﻿ |  |  |  |  |  |  |  |  |  |  | Total
﻿ |  |  |  |  |  |  |  |  | Net Book |  | Pretax
﻿ |  |  |  |  |  |  |  |  | Value |  | (Noncash)
﻿ |  | Fair Value |  | Prior to |  | Impairment
﻿ |  |  | Level 1 |  | Level 2 |  | Level 3 |  | Impairment |  | Expense
﻿(Thousands of dollars) |  |  |  |  |  |  |  |  |  |  |
﻿Assets: |  |  |  |  |  |  |  |  |  |  |
﻿ Impaired proved properties |  |  |  |  |  |  |  |  |  |  |
﻿ Canada |  | $ | – |  | – |  | 71,967 |  | 167,055 |  | 95,088
﻿

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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