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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of Accumulated other comprehensive loss on the Consolidated Balance Sheets at December 31, 2018 and June 30, 2019 and the changes during the six-month period ended June 30, 2019 are presented net of taxes in the following table.
(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, 2018 | $ | (419,852 | ) |  | (182,036 | ) |  | (7,899 | ) |  | (609,787 | )
2019 components of other comprehensive income (loss): |  |  |  |  |  |  |
Before reclassifications to income and retained earnings | 54,055 |  |  | — |  |  | — |  |  | 54,055 |
Reclassifications to income | — |  |  | 5,516 |  | ¹ | 1,171 |  | ² | 6,687 |
Net other comprehensive income (loss) | 54,055 |  |  | 5,516 |  |  | 1,171 |  |  | 60,742 |
Balance at June 30, 2019 | $ | (365,797 | ) |  | (176,520 | ) |  | (6,728 | ) |  | (549,045 | )
1 Reclassifications before taxes of $7,061 are included in the computation of net periodic benefit expense for the six-month period ended June 30, 2019. See Note H for additional information. Related income taxes of $1,545 are included in Income tax expense (benefit) for the six-month period ended June 30, 2019. 2 Reclassifications before taxes of $1,482 are included in Interest expense, net, for the six-month period ended June 30, 2019. Related income taxes of $311 are included in Income tax expense (benefit) for the six-month period ended June 30, 2019. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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