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Debt (Tables)
6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Carrying amount and fair value of debt
The table below summarizes the carrying amount and fair value of the Company’s publicly traded debt and non-publicly traded debt in accordance with the Fair Value Measurements and Disclosures Topic of the ASC. The fair values of the Company’s publicly traded debt are based on quoted market prices. The fair values of the Company’s non-traded debt are estimated using discounted cash flow analyses, based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The Company’s publicly traded debt and non-traded debt are classified as level 1 and level 2, respectively, in the fair value hierarchy.
(Thousands of dollars)
June 30, 2016
 
June 30, 2015
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Publicly traded debt
$
1,906,672

 
$
2,021,174

 
$
1,114,952

 
$
1,129,742

Non-traded debt
4,724

 
4,451

 
4,894

 
4,659