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Other Long-Term Obligations and Commitments (Tables)
9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases
The future minimum lease payments for the rest of fiscal 2013 and thereafter for the operating leases are as follows:

 

(Thousands of dollars)    Operating
Leases
 

2013

   $ 166   

2014

     689   

2015

     588   

2016

     482   

2017

     40   
  

 

 

 

Total minimum payments

   $ 1,965   
  

 

 

 
Reconciliation of Liability for Plugging and Abandonment Costs

A reconciliation of the liability for plugging and abandonment costs for the nine months ended September 30, 2013 is as follows:

 

(Thousands of dollars)       

Asset retirement obligation – December 31, 2012

   $ 9,012   

Liabilities incurred

     165   

Liabilities settled

     (811

Accretion expense

     283   

Revisions in estimated liabilities

     1,791   
  

 

 

 

Asset retirement obligation – September 30, 2013

   $ 10,440