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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Loss [Abstract] |
Components of Accumulated Other Comprehensive Loss |
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﻿ |  |  |  |  |  |  |  |
﻿(Thousands of dollars) | Foreign Currency Translation Gains (Losses) |  | Retirement and Postretirement Benefit Plan Adjustments |  | Deferred Loss on Interest Rate Derivative Hedges |  | Total
﻿Balance at December 31, 2015 | $ | (513,004) |  | (179,260) |  | (12,278) |  | (704,542)
﻿2016 components of other comprehensive income (loss): |  |  |  |  |  |  |  |
﻿Before reclassifications to income |  | 66,449 |  | (3,763) |  | – |  | 62,686
﻿Reclassifications to income |  | – |  | 11,718 | 1 | 1,926 | 2 | 13,644
﻿ Net other comprehensive income |  | 66,449 |  | 7,955 |  | 1,926 |  | 76,330
﻿Balance at December 31, 2016 |  | (446,555) |  | (171,305) |  | (10,352) |  | (628,212)
﻿2017 components of other comprehensive income (loss): |  |  |  |  |  |  |  |
﻿Before reclassifications to income |  | 171,725 |  | (17,269) |  | – |  | 154,456
﻿Reclassifications to income |  | – |  | 9,587 | 1 | 1,926 | 2 | 11,513
﻿ Net other comprehensive income (loss) |  | 171,725 |  | (7,682) |  | 1,926 |  | 165,969
﻿Balance at December 31, 2017 | $ | (274,830) |  | (178,987) |  | (8,426) |  | (462,243)
﻿
| 1 |  | Reclassifications before taxes of $14,821 and $18,036 are included in the computation of net periodic benefit expense in 201 7 and 2016, respectively. See Note K for additional information. Related income taxes of $5,234 and $6,318 are included in income tax expense in 201 7 and 2016, respectively.
| 2 |  | Reclassifications before taxes of $2,963 are included in Interest expense in both 201 7 and 2016. Related income taxes of $1,037 are included in income tax expense in 201 7 and 2016. See Note L for additional information.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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