XML 35 R23.htm IDEA: XBRL DOCUMENT v3.10.0.1
Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 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
 
(68
)
 
474

 
406

Amounts paid
 
(129
)
 
—

 
(129
)
Increases
 
—

 
44

 
44

Reclassifications
 
230

 
(230
)
 
—

Balance at September 30, 2018
 
$
268

 
$
7,462

 
$
7,730