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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss 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.