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Other Long-Term Obligations and Commitments (Tables)
3 Months Ended
Mar. 31, 2014
Text Block [Abstract]  
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases
 The future minimum lease payments for the rest of fiscal 2014 and thereafter for the operating leases are as follows:

 

(Thousands of dollars)    Operating
Leases
 

2014

   $ 563   

2015

     651   

2016

     545   

2017

     46   
  

 

 

 

Total minimum payments

   $ 1,805   
  

 

 

 

Reconciliation of Liability for Plugging and Abandonment Costs

A reconciliation of the liability for plugging and abandonment costs for the three months ended March 31, 2014 is as follows:

 

(Thousands of dollars)       

Asset retirement obligation – December 31, 2013

   $ 10,537   

Liabilities incurred

     35   

Liabilities settled

     (43

Accretion expense

     90   
  

 

 

 

Asset retirement obligation – March 31, 2014

   $ 10,619