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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 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
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, 2014
 
Level 1
 
Level 2
 
Level 3
Pension assets
$
170,600

 
$
51,097

 
$
107,739

 
$
11,764

Foreign currency contracts
(18
)
 
—

 
(18
)
 
—

Copper derivative contracts
355

 
—

 
355

 
—

Interest rate swap
(144
)
 
—

 
(144
)
 
—


(Dollars in thousands)
Carrying amount as of
December 31, 2013
 
Level 1
 
Level 2
 
Level 3
Pension assets
$
171,218

 
$
119,277

 
$
38,584

 
$
13,357

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, 2014, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in Solicore, Inc. The valuation is based on our evaluation of Solicore's financial performance through December 31, 2014 and the most recent round of capital financing that was initiated in the fourth quarter of 2014. See Note 8 - Investment for further details.

(Dollars in thousands)
Carrying amount as of December 31, 2014
 
Level 1
 
Level 2
 
Level 3
Solicore investment
$
341

 
$
—

 
$
—

 
$
341




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, 2014.
(Dollars in thousands)
Solicore investment
 
 
Balance at beginning of year
$
507

Cash investment
—

Impairment reported in earnings
(166
)
Balance at end of year
$
341