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ASSET RETIREMENT OBLIGATIONS
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATIONS
ASSET RETIREMENT OBLIGATIONS:
The change in our asset retirement obligations during the years ended December 31, 2016, 2015 and 2014 is set forth below:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Asset retirement obligations as of the beginning of the year, including current portion
$
225,866

 
$
316,409

 
$
502,513

Liabilities incurred
2,338

 
15,933

 
28,606

Liabilities settled
(19,630
)
 
(72,713
)
 
(55,839
)
Divestment of properties
—

 
(248
)
 
(137,801
)
Accretion expense
40,229

 
25,988

 
28,411

Revision of estimates
(6,784
)
 
(59,503
)
 
(49,481
)
Asset retirement obligations as of the end of the year, including current portion
$
242,019

 
$
225,866

 
$
316,409