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Recently Issued Accounting Pronouncements (Tables)
 3 Months Ended
Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Impact of Adopting ASU 2017-07
The following table summarizes the impact of the standard for the three months ended March 31, 2018 and 2017.
(Thousands of dollars)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended
 
 
 
 
March 31, 2018
 
Three Months Ended March 31, 2017
 
 
Impact of ASU 2017-07
 
As Reported
 
As Previously Reported (Without Adoption of ASU 2017-07)
 
Reclass for ASU 2017-07
 
Reclass of Amortization to Stand-Alone Caption (Unrelated to ASU 2017-07)
 
As Reported in 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
Cost of goods sold
 
$
709

 
$
2,278,159

 
$
1,418,247

 
$
221

 
$
(134
)
 
$
1,418,334

Selling, general and administrative expenses
 
2,835

 
1,214,565

 
1,016,211

 
846

 
(6,036
)
 
1,011,021

Other expense (income) - net
 
(3,544
)
 
(9,272
)
 
(4,367
)
 
(1,067
)
 
 
 
(5,434
)