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Employee and Retiree Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Pension Benefits |  | Other Postretirement Benefits
﻿(Thousands of dollars) | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Change in benefit obligation |  |  |  |  |  |  |  |
﻿Obligation at January 1 | $ | 815,593 |  | 794,589 |  | 106,679 |  | 115,222
﻿Service cost |  | 8,279 |  | 8,136 |  | 1,601 |  | 1,864
﻿Interest cost |  | 27,047 |  | 25,185 |  | 3,444 |  | 3,800
﻿Participant contributions |  | – |  | – |  | 2,075 |  | 1,278
﻿Actuarial loss (gain) |  | 60,855 |  | 58,236 |  | (3,077) |  | (10,627)
﻿Medicare Part D subsidy |  | – |  | – |  | 318 |  | 510
﻿Exchange rate changes |  | 18,751 |  | (30,447) |  | 46 |  | 20
﻿Benefits paid |  | (39,910) |  | (40,928) |  | (4,810) |  | (5,369)
﻿Curtailments |  | – |  | 822 |  | – |  | (19)
﻿Other |  | (8,683) |  | – |  | – |  | –
﻿ Obligation at December 31 |  | 881,932 |  | 815,593 |  | 106,276 |  | 106,679
﻿Change in plan assets |  |  |  |  |  |  |  |
﻿Fair value of plan assets at January 1 |  | 519,357 |  | 521,682 |  | – |  | –
﻿Actual return on plan assets |  | 50,079 |  | 61,860 |  | – |  | –
﻿Employer contributions |  | 24,918 |  | 8,186 |  | 2,417 |  | 3,581
﻿Participant contributions |  | – |  | – |  | 2,075 |  | 1,278
﻿Medicare Part D subsidy |  | – |  | – |  | 318 |  | 510
﻿Exchange rate changes |  | 18,064 |  | (30,609) |  | – |  | –
﻿Benefits paid |  | (39,910) |  | (40,928) |  | (4,810) |  | (5,369)
﻿Other |  | (8,683) |  | (834) |  | – |  | –
﻿ Fair value of plan assets at December 31 |  | 563,825 |  | 519,357 |  | – |  | –
﻿Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |  |  |  |  |  |
﻿Deferred charges and other assets |  | 5,905 |  | 7,591 |  | – |  | –
﻿Other accrued liabilities |  | (8,856) |  | (8,184) |  | (5,392) |  | (5,267)
﻿Deferred credits and other liabilities |  | (315,156) |  | (295,643) |  | (100,884) |  | (101,412)
﻿ Funded status and net plan liability recognized at December 31 | $ | (318,107) |  | (296,236) |  | (106,276) |  | (106,679)
﻿
Amounts Included in Accumulated Other Comprehensive Income Not Recognized in Net Periodic Benefit Expense |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | Pension Benefits |  | Other Postretirement Benefits
﻿Net actuarial loss | $ | (269,063) |  | 221
﻿Prior service (cost) credit |  | (5,824) |  | 38
﻿ | $ | (274,887) |  | 259
﻿
Amounts Included in Accumulated Other Comprehensive Income Expected to be Amortized into Net Periodic Benefit Expense |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | Pension Benefits |  | Other Postretirement Benefits
﻿Net actuarial loss | $ | (15,890) |  | –
﻿Prior service (cost) credit |  | (1,021) |  | 38
﻿ | $ | (16,911) |  | 38
﻿
Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿
﻿ | Projected Benefit Obligations |  | Accumulated Benefit Obligations |  | Fair Value of Plan Assets
﻿(Thousands of dollars) | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Funded qualified plans where accumulated benefit obligation exceeds fair value of plan assets | $ | 691,923 |  | 643,174 |  | 640,230 |  | 599,730 |  | 540,161 |  | 497,894
﻿Unfunded nonqualified and directors' plans where accumulated benefit obligation exceeds fair value of plan assets |  | 172,364 |  | 156,088 |  | 163,319 |  | 150,780 |  | – |  | –
﻿Unfunded other postretirement plans |  | 106,276 |  | 106,678 |  | 106,276 |  | 106,678 |  | – |  | –
﻿
Components of Net Periodic Benefit Expense |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Pension Benefits |  | Other Postretirement Benefits
﻿(Thousands of dollars) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
﻿Service cost | $ | 8,279 |  | 8,136 |  | 17,948 |  | 1,601 |  | 1,864 |  | 3,180
﻿Interest cost |  | 27,047 |  | 25,185 |  | 33,168 |  | 3,444 |  | 3,800 |  | 4,883
﻿Expected return on plan assets |  | (28,941) |  | (28,154) |  | (34,016) |  | – |  | – |  | –
﻿Amortization of prior service cost (credit) |  | 1,026 |  | 1,204 |  | 1,560 |  | (74) |  | (75) |  | (82)
﻿Amortization of transitional (asset) liability |  | – |  | – |  | (1) |  | – |  | – |  | –
﻿Recognized actuarial loss |  | 16,691 |  | 16,165 |  | 15,147 |  | – |  | 5 |  | 992
﻿ |  | 24,102 |  | 22,536 |  | 33,806 |  | 4,971 |  | 5,594 |  | 8,973
﻿Termination benefits expense |  | – |  | – |  | 8,606 |  | – |  | – |  | –
﻿Curtailment expense |  | – |  | 822 |  | 306 |  | – |  | (19) |  | –
﻿Net periodic benefit expense | $ | 24,102 |  | 23,358 |  | 42,718 |  | 4,971 |  | 5,575 |  | 8,973
﻿
Weighted-Average Assumptions used in Measurement of Benefit Obligations and Net Periodic Benefit Expense |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Benefit Obligations |  | Net Periodic Benefit Expense
﻿ | Pension Benefits |  | Other Postretirement Benefits |  | Pension Benefits |  | Other Postretirement Benefits
﻿ | December 31 |  | December 31 |  | Year |  | Year
﻿ | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Discount rate | 3.42% |  | 3.94% |  | 3.73% |  | 4.41% |  | 3.66% |  | 3.84% |  | 4.33% |  | 4.24%
﻿Expected return on plan assets | 5.64% |  | 5.62% |  | – |  | – |  | 5.64% |  | 5.62% |  | – |  | –
﻿Rate of compensation increase | 3.52% |  | 3.52% |  | – |  | – |  | 3.52% |  | 3.52% |  | – |  | –
﻿
Benefit Payments Reflecting Expected Future Service as Appropriate which are Expected to be Paid in Future Years from Assets of Plans or by Company |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | Pension Benefits |  | Other Postretirement Benefits
﻿2018 | $ | 39,929 |  | 6,259
﻿2019 |  | 40,236 |  | 6,280
﻿2020 |  | 41,220 |  | 6,357
﻿2021 |  | 42,276 |  | 6,489
﻿2022 |  | 43,554 |  | 6,560
﻿2023-2027 |  | 227,039 |  | 33,971
﻿ |  |  |  |
﻿
One Percent Change in Assumed Health Care Cost Trend Rates |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | 1% Increase |  | 1% Decrease
﻿Effect on total service and interest cost components of net periodic postretirement benefit expense for the year ended December 31, 2017 | $ | 919 |  | (719)
﻿Effect on the health care component of the accumulated postretirement benefit obligation at December 31, 2017 |  | 15,220 |  | (12,277)
﻿
Weighted Average Asset Allocation for Funded Pension Benefit Plans |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ | December 31, |  |
﻿ | 2017 |  |  | 2016 |  |
﻿Equity securities | 60.3 | % |  | 58.4 | % |
﻿Fixed income securities | 37.2 |  |  | 39.0 |  |
﻿Cash equivalents | 2.5 |  |  | 2.6 |  |
﻿ | 100.0 | % |  | 100.0 | % |
﻿
Fair Value Measurements of Retirement Plan Assets | At December 31, 2017, the fair value measurements of retirement plan assets within the fair value hierarchy are included in the table that follows. ﻿
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Fair Value Measurements Using
﻿(Thousands of dollars) | Fair Value at December 31, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
﻿Domestic Plans |  |  |  |  |  |  |  |
﻿ Equity securities: |  |  |  |  |  |  |  |
﻿ U.S. core equity | $ | 67,343 |  | 67,343 |  | – |  | –
﻿ U.S. small/midcap |  | 24,544 |  | 24,544 |  | – |  | –
﻿ Hedged funds and other alternative strategies |  | 50,522 |  | – |  | 12,572 |  | 37,950
﻿ International commingled trust fund |  | 83,960 |  | – |  | 83,960 |  | –
﻿ Emerging market commingled equity fund |  | 20,774 |  | – |  | 20,774 |  | –
﻿ Fixed income securities: |  |  |  |  |  |  |  |
﻿ U.S. fixed income |  | 79,890 |  | – |  | 79,890 |  | –
﻿ International commingled trust fund |  | 13,122 |  | – |  | 13,122 |  | –
﻿ Emerging market mutual fund |  | 5,266 |  | – |  | 5,266 |  | –
﻿ Cash and equivalents |  | 5,871 |  | 5,871 |  | – |  | –
﻿ Total Domestic Plans |  | 351,292 |  | 97,758 |  | 215,584 |  | 37,950
﻿Foreign Plans |  |  |  |  |  |  |  |
﻿ Equity securities funds |  | 78,666 |  | – |  | 78,666 |  | –
﻿ Fixed income securities funds |  | 103,314 |  | – |  | 103,314 |  | –
﻿ Diversified pooled fund |  | 23,665 |  | – |  | 23,665 |  | –
﻿ Cash and equivalents |  | 6,888 |  | – |  | 6,888 |  | –
﻿ Total Foreign Plans |  | 212,533 |  | – |  | 212,533 |  | –
﻿ Total | $ | 563,825 |  | 97,758 |  | 428,117 |  | 37,950
﻿ At December 31, 2016, the fair value measurements of retirement plan assets within the fair value hierarchy are included in the table that follows. ﻿
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Fair Value Measurements Using
﻿(Thousands of dollars) | Fair Value at December 31, 2016 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
﻿Domestic Plans |  |  |  |  |  |  |  |
﻿ Equity securities: |  |  |  |  |  |  |  |
﻿ U.S. core equity | $ | 61,554 |  | 61,554 |  | – |  | –
﻿ U.S. small/midcap |  | 23,103 |  | 23,103 |  | – |  | –
﻿ Hedged funds and other alternative strategies |  | 48,113 |  | – |  | 13,999 |  | 34,114
﻿ International commingled trust fund |  | 67,451 |  | – |  | 67,451 |  | –
﻿ Emerging market commingled equity fund |  | 16,006 |  | – |  | 16,006 |  | –
﻿ Fixed income securities: |  |  |  |  |  |  |  |
﻿ U.S. fixed income |  | 78,473 |  | – |  | 78,473 |  | –
﻿ International commingled trust fund |  | 13,486 |  | – |  | 13,486 |  | –
﻿ Emerging market mutual fund |  | 5,775 |  | – |  | 5,775 |  | –
﻿ Cash and equivalents |  | 7,821 |  | 7,821 |  | – |  | –
﻿ Total Domestic Plans |  | 321,782 |  | 92,478 |  | 195,190 |  | 34,114
﻿Foreign Plans |  |  |  |  |  |  |  |
﻿ Equity securities funds |  | 74,108 |  | – |  | 74,108 |  | –
﻿ Fixed income securities funds |  | 97,075 |  | – |  | 97,075 |  | –
﻿ Diversified pooled fund |  | 21,463 |  | – |  | 21,463 |  | –
﻿ Cash and equivalents |  | 4,929 |  | – |  | 4,929 |  | –
﻿ Total Foreign Plans |  | 197,575 |  | – |  | 197,575 |  | –
﻿ Total | $ | 519,357 |  | 92,478 |  | 392,765 |  | 34,114
﻿
Effects of Fair Value Measurements Using Significant Unobservable Inputs on Changes in Level 3 Plan Assets |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | Hedged Funds and Other Alternative Strategies
﻿Total at December 31, 2015 |  | $ | 33,929 |
﻿Actual return on plan assets: |  |  |  |
﻿ Relating to assets held at the reporting date |  |  | 185 |
﻿ Relating to assets sold during the period |  |  | – |
﻿Purchases, sales and settlements |  |  | – |
﻿ Total at December 31, 2016 |  |  | 34,114 |
﻿Actual return on plan assets: |  |  |  |
﻿ Relating to assets held at the reporting date |  |  | 3,836 |
﻿ Relating to assets sold during the period |  |  | – |
﻿Purchases, sales and settlements |  |  | – |
﻿ Total at December 31, 2017 |  | $ | 37,950 |
﻿
Foreign Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Pension Benefits |  | Other Postretirement Benefits
﻿(Thousands of dollars) | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Benefit obligation at December 31 | $ | 222,483 |  | 206,502 |  | 791 |  | 615
﻿Fair value of plan assets at December 31 |  | 212,535 |  | 197,575 |  | – |  | –
﻿Net plan liabilities recognized |  | 9,948 |  | 8,927 |  | 791 |  | 615
﻿Net periodic benefit expense (benefit) |  | 194 |  | (2,244) |  | 133 |  | 154
﻿

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -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 + Details
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