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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of changes in AROs
The following table presents information regarding our AROs (in thousands):
ARO liability balance, January 1, 2014
$
10,917

Decrease in ARO liability (1)
(3,798
)
ARO settlements
(3,456
)
ARO liability balance, December 31, 2014 (2)
3,663

Increase in ARO liability (3)
4,200

ARO settlements
(1,040
)
ARO liability balance, December 31, 2015 (2)
$
6,823

____________________________
(1)
In 2014, we recorded a $3.8 million reduction to our ARO related to the abandonment of a portion of our NORCO pipeline system.  See Note 5 for further information.
(2)
Amount includes $1.4 million and $1.1 million within “Accrued and other current liabilities” and $5.4 million and $2.6 million within “Other non-current liabilities” in the accompanying consolidated balance sheets as of December 31, 2015 and 2014, respectively.
(3)
In 2015, we recorded an ARO of $4.2 million in connection with the acquisition of a pipeline in Springfield, Massachusetts. See Note 3 for further information.
Schedule of activity in the allowance for doubtful accounts
The following table presents activity in the allowance for doubtful accounts at the dates indicated (in thousands):
 
December 31,
 
2015
 
2014
 
2013
Balance at beginning of period
$
5,784

 
$
2,019

 
$
3,425

Charged to expense
2,983

 
3,985

 
6

Write-offs, net of recoveries
(387
)
 
(220
)
 
(1,412
)
Balance at end of period
$
8,380

 
$
5,784

 
$
2,019