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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities
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.