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Assets and Liabilities Measured at Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2017
Assets and Liabilities Measured at Fair Value [Abstract] |
Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | December 31, 2017 |  | December 31, 2016
﻿(Thousands of dollars) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  |  | Level 2 |  | Level 3 |  | Total
﻿Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ Nonqualified employee savings plans | $ | 16,158 |  | – |  | – |  | 16,158 |  | 13,904 |  |  | – |  | – |  | 13,904
﻿ Commodity derivative contracts |  | – |  | 39,093 |  | – |  | 39,093 |  | – |  |  | 48,864 |  | – |  | 48,864
﻿ Foreign currency exchange derivative contracts |  | – |  | – |  | – |  | – |  | – |  |  | 73 |  | – |  | 73
﻿ | $ | 16,158 |  | 39,093 |  | – |  | 55,251 |  | 13,904 |  |  | 48,937 |  | – |  | 62,841
﻿
Carrying Amounts and Estimated Fair Values of Financial Instruments |
﻿ |  |  |  |  |  |  |  |
﻿ | At December 31,
﻿ | 2017 |  | 2016
﻿(Thousands of dollars) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
﻿Financial assets (liabilities): |  |  |  |  |  |  |  |
﻿ Canadian government securities with maturities greater than 90 days at the date of acquisition | $ | - |  | - |  | 111,542 |  | 111,331
﻿ Current and long-term debt |  | (2,916,422) |  | (2,993,003) |  | (2,992,567) |  | (2,951,992)
﻿
Nonrecurring Fair Value Measurements | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31, 2016
﻿ |  |  |  |  |  |  |  |  |  |  | Total
﻿ |  |  |  |  |  |  |  |  | Net Book |  | Pretax
﻿ |  |  |  |  |  |  |  |  | Value |  | (Noncash)
﻿ |  | Fair Value |  | Prior to |  | Impairment
﻿(Thousands of dollars) |  |  | Level 1 |  | Level 2 |  | Level 3 |  | Impairment |  | Expense
﻿Assets: |  |  |  |  |  |  |  |  |  |  |
﻿ Impaired proved properties |  |  |  |  |  |  |  |  |  |  |
﻿ Western Canada |  | $ | – |  | – |  | 71,967 |  | 167,055 |  | 95,088
﻿ |  | $ | – |  | – |  | 71,967 |  | 167,055 |  | 95,088
﻿

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- Definition Carrying Value and Fair Value of Financial Instruments Disclosure. + References No definition available. + Details
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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 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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