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Long Term Debt (Tables)
9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Components of Long-term Debt

The components of long-term debt as of the dates indicated below were as follows:

 

     September 30, 2016      December 31, 2015  
     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       $ 3,064       $ 500,000       $ 3,999   

Revolving Credit Facility due October 1, 2017 with a group of commercial banks, interest payable at variable rates

     132,400         —           57,500         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total long-term debt

   $ 632,400       $ 3,064       $ 557,500       $ 3,999