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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Asset retirement obligation activity
ARO activity was as follows (in thousands):
 
 
 
2015
 
2014
 
 

 

AROs as of January 1,
 
$
42,502

 
$
41,687

Accretion
 
1,675

 
1,612

Additions
 
802

 
664

Settlements
 
(1,110
)
 
(1,461
)
Revisions in Estimated Cash Flows (A)
 
14,074

 
—

ARO's as of December 31,
 
$
57,943

 
$
42,502


(A) The revision in estimated cash flows reflects an increase in the contractual cost to settle ARO. A corresponding increase was made to Regulatory Assets, thus having no impact on earnings.