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Other Long-Term Liabilities (Tables)
6 Months Ended
Jun. 30, 2015
Other Liabilities Disclosure [Abstract]  
Summary of Other Long-Term Liabilities
Other long-term liabilities consisted of the following:
 
 
June 30, 2015
 
December 31, 2014
 
 
(Dollars in thousands)
Asset retirement obligations
 
$
7,043

 
$
6,805

Dividends payable — 2015 LTIP
 
64

 

Escheat liability
 
145

 
220

Capital lease payable
 
2

 
6

Lease incentive
 
560

 
426

Deferred rent
 
371

 
404

Royalty payable
 
270

 
270

Total other long-term liabilities
 
$
8,455

 
$
8,131