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Assets and Liabilities Measured at Fair Value | 12 Months Ended
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Dec. 31, 2017
Assets and Liabilities Measured at Fair Value [Abstract] |
Assets and Liabilities Measured at Fair Value | Note Q – Assets and Liabilities Measured at Fair Value ﻿ ﻿ Fair Values – Recurring ﻿ The Company carries certain assets and liabilities at fair value in its Consolidated Balance Sheet. The fair value hierarchy is based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants. ﻿ The fair value measurements for these assets and liabilities at December 31, 201 7 and 201 6 are presented in the following table. ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 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
﻿ The fair value of West Texas Intermediate (WTI) crude oil contracts in 201 7 and 201 6 was based on active market quotes for WTI crude oil. The fair value of foreign exchange derivative contracts in 2016 was based on market quotes for similar contracts at the balance sheet date. The income effect of changes in fair value of crude oil derivative contracts is recorded in Sales and other operating revenues in the Consolidated Statements of Operations, while the effects of changes in fair value of foreign exchange derivative contracts is recorded in Interest and other income. The nonqualified employee savings plan is an unfunded savings plan through which participants seek a return via phantom investments in equity securities and/or mutual funds. The fair value of this liability was based on quoted prices for these equity securities and mutual funds. The income effect of changes in the fair value of the nonqualified employee savings plan is recorded in Selling and g eneral e xpenses in the Consolidated Statements of Operations. ﻿ The Company offsets certain assets and liabilities related to derivative contracts when the legal right of offset exists. There were no offsetting positions recorded at December 31, 201 7 and 201 6. ﻿ The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 201 7 and 201 6. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes cash and cash equivalents, trade accounts receivable, trade accounts payable and accrued expenses, all of which had fair values approximating carrying amounts. The carrying value of Canadian government securities was determined based on cost plus earned interest. The fair value of current and long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal. ﻿
﻿ |  |  |  |  |  |  |  |
﻿ | 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)
﻿ ﻿ Fair Values – Nonrecurring ﻿ As a result of significantly lower commodity prices during 2016, the Company recognized $95.1 million, respectively, in pretax noncash impairment charges related primarily to producing properties. The fair value information associated with these impaired properties is presented in the following table. ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 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
﻿ The fair values were determined by internal discounted cash flow models using estimates of future production, prices from futures exchanges, costs and a discount rate believed to be consistent with those used by principal market participants in the applicable region.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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