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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 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 |  | 171,725 |  | (7,682) |  | 1,926 |  | 165,969
﻿Balance at December 31, 2017 |  | (274,830) |  | (178,987) |  | (8,426) |  | (462,243)
﻿2018 components of other comprehensive income (loss): |  |  |  |  |  |  |  |
﻿Before reclassifications to income |  | (145,022) |  | (16,839) |  | (1,815) |  | (163,676)
﻿Reclassifications to income |  | – |  | 13,790 | 1 | 2,342 | 2 | 16,132
﻿ Net other comprehensive income (loss) |  | (145,022) |  | (3,049) |  | 527 |  | (147,544)
﻿Balance at December 31, 2018 | $ | (419,852) |  | (182,036) |  | (7,899) |  | (609,787)
﻿
| 1 |  | Reclassifications before taxes of $17,313 and $14,821 are included in the computation of net periodic benefit expense in 2018 and 2017, respectively. See Note L for additional information. Related income taxes of $3,523 and $5,234 are included in income tax expense in 2018 and 2017, respectively.
| 2 |  | Reclassifications before taxes of $2,963 are included in Interest expense in both 2018 and 2017. Related income taxes of $622 and $1,037 are included in income tax expense in 2018 and 2017. See Note M 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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