v3.7.0.1
ASSET RETIREMENT OBLIGATION (Tables)
3 Months Ended
Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes to Asset Retirement Obligation
Following is a table of the changes to our asset retirement obligation for the following periods (in thousands):
 
 
Three Months Ended March 31,
 
 
2017
 
2016
Asset retirement obligation, at beginning of period
 
$
19,976

 
$
22,951

Accretion of discount
 
389

 
442

Total asset retirement obligation, at end of period
 
$
20,365

 
$
23,393