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Changes in Cumulative Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 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 
52,732

 
 
 
 
 
 
 
52,732

Amounts reclassified from Other comprehensive loss (1)


 
(209
)
 
(2,320
)
 
(988
)
 
(3,517
)
Net change
52,732

 
(209
)
 
(2,320
)
 
(988
)
 
49,215

Balance at March 31, 2018
$
(300,614
)
 
$
(85,072
)
 
$
—

 
$
50,031

 
$
(335,655
)


(1) Net of taxes of $90 for pension and other postretirement benefit adjustments, $760 for realized gains on the sale of available-for-sale securities and $1,047 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 (2)
20,778

 
 
 
630

 
(30,754
)
 
(9,346
)
Amounts reclassified from Other comprehensive loss (3)
 
 
279

 
5

 
 
 
284

Net change
20,778

 
279

 
635

 
(30,754
)
 
(9,062
)
Balance at March 31, 2017
$
(480,499
)
 
$
(124,817
)
 
$
1,650

 
$
54,253

 
$
(549,413
)


(2) Net of taxes of $(389) for unrealized net gains on available-for-sale securities and $18,895 for unrealized net losses on cash flow hedges.
(3) Net of taxes of $(142) for pension and other postretirement benefit adjustments and $(3) for realized losses on the sale of available-for-sale securities.