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ASSET RETIREMENT OBLIGATIONS (Tables)
 3 Months Ended
Mar. 31, 2018
ASSET RETIREMENT OBLIGATION  
Schedule of Asset Retirement Obligations

Aggregate carrying amounts of asset retirement obligations are as follows (dollars in thousands):

 

 

 

 

 

 

 

 

March 31, 

 

 

 

    

2018

    

 

Asset retirement obligations at beginning of period

 

$

56,855

 

 

Liabilities incurred

 

 

 —

 

 

Liabilities settled

 

 

(1,050)

 

 

Accretion expense

 

 

1,571

 

 

Change in cash flow estimate

 

 

(560)

 

 

Total asset retirement obligations at end of period

 

$

56,816

 

 

Less current asset retirement obligations at end of period

 

 

(2,999)

 

 

Long-term asset retirement obligations at end of period

 

$

53,817