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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
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,
 
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.