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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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
 
2

 
138

 
140

Amounts paid
 
(44
)
 
—

 
(44
)
Reclassifications
 
162

 
(162
)
 
—

Balance at March 31, 2017
 
$
205

 
$
7,448

 
$
7,653