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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of reconciliation of changes in product warranty liabilities

Product warranty liabilities are included in “Accrued liabilities” in the Condensed Consolidated Balance Sheets. Below is a reconciliation of changes in product warranty liabilities:

 

(Dollars in thousands)   Six Months Ended 
June 30,
 
    2015     2014  
Balance, January 1   $ 17     $ 17  
Accruals for warranties issued     9       10  
Settlements made (in cash or in kind)     (7 )     (6 )
Balance, end of period   $ 19     $ 21