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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
Long-term debt consisted of the following:
 
 
December 31,
(Thousands of dollars)
 
2015
 
2014
6% senior notes due 2023 (net of unamortized discount of $6,692 at 2015 and $7,557 at 2014)
 
$
493,308

 
$
492,443

Less unamortized debt issuance costs
 
(3,526
)
 
(4,193
)
Total notes payable, net
 
489,782

 
488,250

Capitalized lease obligations, vehicles, due through 2018
 
600

 
—

Less current maturities
 
(222
)
 
—

Total long-term debt
 
$
490,160

 
$
488,250