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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016
 
$
296

 
$
7,543

 
$
7,839

Accretion
 
18

 
293

 
311

Amounts Paid
 
(130
)
 
—

 
(130
)
Asset additions recorded, net
 
—

 
14

 
14

Reclassifications
 
38

 
(38
)
 
—

Balance at June 30, 2016
 
$
222

 
$
7,812

 
$
8,034