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Changes in Cumulative Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Changes in Cumulative Other Comprehensive Loss
The following tables summarize the changes in Cumulative other comprehensive loss for the six months ended June 30, 2018 and 2017:
 
 
 
 
 
 
 
 
 
 
(Thousands of dollars)
Foreign Currency Translation Adjustments
 
Pension and Other Postretirement Benefit Adjustments
 
Unrealized Net Gains on Available-for-Sale Securities
 
Unrealized Net Gains on Cash Flow Hedges
 
Total Cumulative Other Comprehensive (Loss) Income
Balance at December 31, 2017
$
(353,346
)
 
$
(84,863
)
 
$
2,320

 
$
51,019

 
$
(384,870
)
Amounts recognized in Other comprehensive loss 
(152,296
)
 
 
 
 
 
 
 
(152,296
)
Amounts reclassified from Other comprehensive loss (1)


 
(65
)
 
(2,320
)
 
(2,898
)
 
(5,283
)
Net change
(152,296
)
 
(65
)
 
(2,320
)
 
(2,898
)
 
(157,579
)
Balance at June 30, 2018
$
(505,642
)
 
$
(84,928
)
 
$
—

 
$
48,121

 
$
(542,449
)


(1) Net of taxes of $505 for pension and other postretirement benefit adjustments, $760 for realized gains on the sale of available-for-sale securities and $1,195 for realized gains on cash flow hedges.

 
 
 
 
 
 
 
 
 
 
(Thousands of dollars)
Foreign Currency Translation Adjustments
 
Pension and Other Postretirement Benefit Adjustments
 
Unrealized Net Gains on Available-for-Sale Securities
 
Unrealized Net Gains (Losses) on Cash Flow Hedges
 
Total Cumulative Other Comprehensive (Loss) Income
Balance at December 31, 2016
$
(501,277
)
 
$
(125,096
)
 
$
1,015

 
$
85,007

 
$
(540,351
)
Amounts recognized in Other comprehensive loss (1)
51,250

 
 
 
870

 
(30,754
)
 
21,366

Amounts reclassified from Other comprehensive loss (2)
 
 
385

 
8

 
(644
)
 
(251
)
Net change
51,250

 
385

 
878

 
(31,398
)
 
21,115

Balance at June 30, 2017
$
(450,027
)
 
$
(124,711
)
 
$
1,893

 
$
53,609

 
$
(519,236
)


(1) Net of taxes of $(537) for unrealized net gains on available-for-sale securities and $18,895 for unrealized net losses on cash flow hedges.
(2) Net of taxes of $(195) for pension and other postretirement benefit adjustments, $(5) for realized losses on the sale of available-for-sale securities and $396 for realized gains on cash flow hedges.