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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value on a Recurring Basis, Categorized by the Level of Inputs Used in the Valuation
From time to time we enter into various instruments that require fair value measurement, including foreign currency option contracts, interest rate swaps and copper derivative contracts. Assets and liabilities measured on a recurring basis, categorized by the level of inputs used in the valuation, include:

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

 
—

 
—

 
—

Copper derivative contracts
 
495

 
—

 
495

 
—

Interest rate swap
 
(269
)
 
—

 
(269
)
 
—

(Dollars in thousands)
 
Carrying amount as of December 31, 2013
 
Level 1
 
Level 2
 
Level 3
Foreign currency contracts
 
(77
)
 
—

 
(77
)
 
—

Copper derivative contracts
 
984

 
—

 
984

 
—

Interest rate swap
 
(296
)
 
—

 
(296
)
 
—
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, 2013, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in Solicore, Inc.


(Dollars in thousands)
Carrying amount as of December 31, 2013
 
Level 1
 
Level 2
 
Level 3
Solicore investment
$
507

 
$
—

 
$
—

 
$
507


The table below sets forth a summary of changes in the fair value of the Solicore investment Level 3 asset for the year ended December 31, 2013.
(Dollars in thousands)
Solicore investment
 
 
Balance at beginning of year
$
5,000

Cash investment
127

Impairment reported in earnings
(4,620
)
Balance at end of year
$
507