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Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Components of Debt
Listed below is information regarding our indebtedness. All indebtedness owed under our Senior Notes as of September 30, 2018 is classified as short-term debt on our balance sheet as of such date.
 
 
September 30, 2018
 
December 31, 2017
 
 
Principal
 
Unamortized
Debt
Issuance
Debt Cost
 
Principal
 
Unamortized
Debt
Issuance
Debt Cost
 
 
(Thousands of dollars)
Senior Notes issued March 17, 2014, interest only payable semi-annually at 5.25%, maturing March 15, 2019
 
$
500,000

 
$
571

 
$
500,000

 
$
1,506

Revolving Credit Facility due March 7, 2019 with a group of commercial banks, interest payable at variable rates
 

 

 
117,500

 

Related Party Term Loan - Thirty Two L.L.C., interest payable quarterly at 6%, due September 28, 2020
 
$
130,000

 
$
874

 
$

 
$

Total indebtedness
 
$
630,000

 
$
1,445

 
$
617,500

 
$
1,506