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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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
 
10

 
128

 
138

Amounts paid
 
(29
)
 
—

 
(29
)
Increases
 
—

 
3

 
3

Reclassifications
 
29

 
(29
)
 
—

Balance at March 31, 2019
 
$
44

 
$
6,615

 
$
6,659