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Accounts Payable and Accrued Liabilities
12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities
Accounts Payable and Accrued Liabilities
 
Trade accounts payable and accrued liabilities consisted of the following:
 
December 31,
(Thousands of dollars)
2015
 
2014
Trade accounts payable
$
226,769

 
$
227,113

Excise taxes/withholdings payable
75,704

 
71,273

Accrued insurance obligations
23,347

 
19,280

Other
64,521

 
63,605

Accounts payable and accrued liabilities
$
390,341

 
$
381,271