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Assets and Liabilities Measure at Fair Value (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments
The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2015 and 2014. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal.
 
 
 
December 31, 2015
 
December 31, 2014
 
 
Carrying
 
 
 
Carrying
 
 
(Thousands of dollars)
 
Amount
 
Fair Value
 
Amount
 
Fair Value
Financial liabilities
 
 
 
 
 
 
 
 
Current and long-term debt
 
$
(490,382
)
 
$
(511,916
)
 
$
(488,250
)
 
$
(510,344
)