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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Changes in Asset Retirement Obligation Liabilities
The components of the changes in the asset retirement obligation liabilities were:
(Dollars in thousands)
 
Short-Term
Portion
 
Long-Term
Portion
 
Total
Balance at January 1, 2017
 
$
85

 
$
7,472

 
$
7,557

Accretion
 
4

 
276

 
280

Amounts paid
 
(129
)
 
—

 
(129
)
Asset additions recorded, net
 
—

 
26

 
26

Reclassifications
 
226

 
(226
)
 
—

Balance at June 30, 2017
 
$
186

 
$
7,548

 
$
7,734