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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2013
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,
 
2013
 
2012
Balance at beginning of year
$
4,513

 
$
6,283

Liabilities incurred1
1,675

 
57

Liabilities settled
(220
)
 
(236
)
Sale of properties
—

 
(1,976
)
Accretion expense
469

 
385

Balance at end of year
$
6,437

 
$
4,513

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