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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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
 
(22
)
 
157

 
135

Amounts paid
 
(13
)
 
—

 
(13
)
Increases
 
—

 
15

 
15

Reclassifications
 
80

 
(80
)
 
—

Balance at March 31, 2018
 
$
280

 
$
7,266

 
$
7,546