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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Changes in Asset Retirement Obligation Liabilities
The components of the changes in the asset retirement obligation liabilities were:
 
 
Short-Term
Portion
 
Long-Term
Portion
 
Total
 
 
(Dollars in thousands)
Balance at January 1, 2013
 
$
379

 
$
7,557

 
$
7,936

Accretion (1)
 
(85
)
 
508

 
423

Additions
 
—

 
112

 
112

Reclassifications
 
693

 
(693
)
 
—

Amounts paid
 
(324
)
 
—

 
(324
)
Balance at September 30, 2013
 
$
663

 
$
7,484

 
$
8,147

 
(1) 
Difference in accretion from accretion expense in Note 7 is due to accretion on the IMCO royalty payable.