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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)
9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table summarizes the Company’s asset retirement obligations:
 
September 30, 2016
 
December 31, 2015
Asset retirement obligation, beginning of period
$
8,573

 
$
5,683

 Revision of estimate
71

 
877

 Acquired in asset acquisitions or business combinations
5,454

 
2,145

 Accretion of liabilities
526

 
494

 Settlements
(1,375
)
 
(626
)
Asset retirement obligation, end of period
$
13,249

 
$
8,573

Asset retirement obligation:
 
 
 
 Current
$
360

 
$
1,000

 Non-current
12,889

 
7,573

Asset retirement obligation, end of period
$
13,249

 
$
8,573

Schedule of Restricted Cash and Cash Equivalents
The following table summarizes the Company’s restricted cash:
 
September 30, 2016
 
December 31, 2015
Restricted cash, beginning of period
$
12,980

 
$
16,148

 Restricted cash from acquisitions
4,478

 
2,100

 Refunds of collateral

 
(5,268
)
 Additional collateral posted
4,115

 

Restricted cash, end of period
$
21,573

 
$
12,980