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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018
 
$
235

 
$
7,174

 
$
7,409

Accretion
 
(45
)
 
315

 
270

Amounts paid
 
(83
)
 
—

 
(83
)
Increases
 
—

 
39

 
39

Reclassifications
 
177

 
(177
)
 
—

Balance at June 30, 2018
 
$
284

 
$
7,351

 
$
7,635