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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019
 
$
34

 
$
6,513

 
$
6,547

Accretion
 
20

 
256

 
276

Amounts paid
 
(84
)
 
—

 
(84
)
Increases
 
—

 
16

 
16

Reclassifications
 
104

 
(104
)
 
—

Balance at June 30, 2019
 
$
74

 
$
6,681

 
$
6,755