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Other Long-Term Obligations and Commitments (Tables)
9 Months Ended
Sep. 30, 2014
Text Block [Abstract]  
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases

The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. 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

   $ 188   

2015

     651   

2016

     545   

2017

     46   
  

 

 

 

Total minimum payments

   $ 1,430   
  

 

 

 
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, 2014 is as follows:

 

(Thousands of dollars)       

Asset retirement obligation – December 31, 2013

   $ 10,537   

Liabilities incurred

     1,579   

Liabilities settled

     (642

Gain on settlement of liabilities

     (1,787

Accretion expense

     275   

Revisions in estimated liabilities

     —     
  

 

 

 

Asset retirement obligation – September 30, 2014

   $ 9,962