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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
The following table reconciles our AROs as of the dates presented, which are included in the Other liabilities caption on our Consolidated Balance Sheets: 
 
As of December 31,
 
2014
 
2013
Balance at beginning of year
$
6,437

 
$
4,513

Changes in estimates
112

 
—

Liabilities incurred 1
238

 
1,675

Liabilities settled
(92
)
 
(220
)
Sale of properties
(1,224
)
 
—

Accretion expense
419

 
469

Balance at end of year
$
5,890

 
$
6,437

 
____________________ 
1 Includes $1.5 million recognized in 2013 in connection with the EF Acquisition.