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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation
Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:
(Dollars in thousands)
Carrying amount as of
December 31, 2015
 
Level 1
 
Level 2
 
Level 3
Foreign currency contracts
$
(78
)
 
$
—

 
$
(78
)
 
$
—

Copper derivative contracts
$
193

 
$
—

 
$
193

 
$
—

Interest rate swap
$
(18
)
 
$
—

 
$
(18
)
 
$
—


(Dollars in thousands)
Carrying amount as of
December 31, 2014
 
Level 1
 
Level 2
 
Level 3
Foreign currency contracts
$
(18
)
 
$
—

 
$
(18
)
 
$
—

Copper derivative contracts
$
355

 
$
—

 
$
355

 
$
—

Interest rate swap
$
(144
)
 
$
—

 
$
(144
)
 
$
—
Assets measured at fair value on a nonrecurring basis
The following table presents information about our assets and liabilities measured at fair value on a non-recurring basis as of December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in BrightVolt, Inc. (formerly known as Solicore, Inc.) The valuation is based on our evaluation of BrightVolt's financial performance through December 31, 2015 and the most recent round of capital financing that was initiated in the first quarter of 2015. See Note 9, "Investment" for further details.

(Dollars in thousands)
Carrying amount as of December 31, 2015
 
Level 1
 
Level 2
 
Level 3
BrightVolt investment
$
341

 
$
—

 
$
—

 
$
341

There were no changes in the fair value of the BrightVolt investment Level 3 asset for the year ended December 31, 2015.