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Asset Retirement Obligation (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
ASSET RETIREMENT OBLIGATION    
Summary of Asset Retirement Obligation

The following table summarizes the changes in the reserve for future restoration and reclamation costs on the balance sheet:

 

 

 

 

 

 

 

 

    

March 31,

    

December 31,

(thousands of dollars)

 

2019

 

2018

Balance, beginning of period

 

$

6,203

 

$

5,731

Liabilities settled

 

 

(335)

 

 

(521)

Accretion expense

 

 

126

 

 

993

Balance, end of period

 

 

5,994

 

 

6,203

Less: Current portion

 

 

(894)

 

 

(708)

Non-current portion

 

$

5,100

 

$

5,495

 

Changes to the Company’s asset retirement obligation are summarized below:

 

   December 31,   December 31, 
   2018   2017 
   (thousands of dollars) 
Balance, beginning of period  $5,731   $4,789 
Liabilities settled   (521)   (97)
Accretion expense   993    1,039 
Balance, end of period   6,203    5,731 
Less:  Included in liabilities held for sale   -    - 
Less:  Current portion   (708)   (1,078)
Non-current portion  $5,495   $4,653