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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value of Financial Instruments (Thousands of Dollars) [Abstract] |
Fair Value Hierarchy |
| Fair Value Measurements Using:
|  |  |  | Quoted |  |  |  |  |  |
|  |  |  | Prices in |  |  |  |  |  |
|  |  |  | Active |  |  |  |  |  |
|  |  |  | Markets |  | Significant |  |  |
|  |  |  | for |  | Other |  | Significant
|  |  |  | Identical |  | Observable |  | Unobservable
| Fair |  | Assets |  | Inputs |  | Inputs
| Value |  | (Level 1) |  | (Level 2) |  | (Level 3)
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | $ | 2,346 |  |  | 2,346 |  |  | - |  |  | -
Derivatives |  | 20,079 |  |  | - |  |  | 20,079 |  |  | -
Total assets | $ | 22,425 |  |  | 2,346 |  |  | 20,079 |  |  | -
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivatives | $ | 2,113 |  |  | - |  |  | 2,113 |  |  | -
Option agreement |  | 23,460 |  |  | - |  |  | - |  |  | 23,460
Total liabilities | $ | 25,573 |  |  | - |  |  | 2,113 |  |  | 23,460
October 1, 2017 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | $ | 2,866 |  |  | 2,866 |  |  | - |  |  | -
Derivatives |  | 11,975 |  |  | - |  |  | 11,975 |  |  | -
Total assets | $ | 14,841 |  |  | 2,866 |  |  | 11,975 |  |  | -
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivatives | $ | 22,671 |  |  | - |  |  | 22,671 |  |  | -
Option agreement |  | 28,510 |  |  | - |  |  | - |  |  | 28,510
Total liabilities | $ | 51,181 |  |  | - |  |  | 22,671 |  |  | 28,510
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | $ | 3,126 |  |  | 3,126 |  |  | - |  |  | -
Derivatives |  | 12,226 |  |  | - |  |  | 12,226 |  |  | -
Total assets | $ | 15,352 |  |  | 3,126 |  |  | 12,226 |  |  | -
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivatives | $ | 23,051 |  |  | - |  |  | 23,051 |  |  | -
Option agreement |  | 23,980 |  |  | - |  |  | - |  |  | 23,980
Total Liabilities | $ | 47,031 |  |  | - |  |  | 23,051 |  |  | 23,980
Reconciliation of Level 3 Fair Value |
| 2018 |  | 2017
Balance at beginning of year | $ | (23,980) |  |  | (28,770)
Gain from change in fair value |  | 520 |  |  | 260
Balance at end of third quarter | $ | (23,460) |  |  | (28,510)

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 (c) -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 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + 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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