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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Changes in Asset Retirement Obligations
The following table presents the change in our asset retirement obligations during the indicated periods (in thousands, inclusive of current portion):
 
 
Successor
 
 
Predecessor
 
 
Period from
March 1, 2017
through
December 31, 2017
 
 
Period from
January 1, 2017
through
February 28, 2017
 
Year Ended December 31,
 
 
 
 
 
2016
 
2015
Beginning balance
 
$
290,067

 
 
$
242,019

 
$
225,866

 
$
316,409

Liabilities incurred
 
2,280

 
 
—

 
2,338

 
15,933

Liabilities settled
 
(81,197
)
 
 
(3,641
)
 
(19,630
)
 
(72,713
)
Divestment of properties
 
—

 
 
(8,672
)
 
—

 
(248
)
Accretion expense
 
21,151

 
 
5,447

 
40,229

 
25,988

Revision of estimates
 
(19,200
)
 
 
—

 
(6,784
)
 
(59,503
)
Fair value fresh start adjustment
 
—

 
 
54,914

 
—

 
—

Asset retirement obligations, end of period
 
$
213,101

 
 
$
290,067

 
$
242,019

 
$
225,866