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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2013
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 measured on a recurring basis, categorized by the level of inputs used in the valuation, include:

(Dollars in thousands)
Balance Sheet Location
 
Carrying amount as of June 30, 2013
 
Level 1
 
Level 2
 
Level 3
Assets
 
 
 
 
 
 
 
 
 
Pension assets (1)
 
 
$
156,741

 
$
106,619

 
$
33,530

 
$
16,592

Foreign exchange option contracts
Other current assets
 
(9
)
 

 
(9
)
 

Copper derivative instruments
Other current assets
 
56

 

 
56

 

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swap instrument
Other accrued liabilities
 
(249
)
 

 
(249
)
 

(Dollars in thousands)
Balance Sheet Location
 
Carrying amount as of December 31, 2012
 
Level 1
 
Level 2
 
Level 3
Assets
 
 
 
 
 
 
 
 
 
Pension assets (1)

 
$
143,540

 
$
98,269

 
$
29,869

 
$
15,402

Foreign exchange option contracts
Other current assets
 
15

 

 
15

 

Copper derivative instruments
Other current assets
 
267

 

 
267

 

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swap instrument
Other accrued liabilities
 
(361
)
 

 
(361
)
 

Reconciliation of Assets Measured at Fair Value on a Recurring Basis using Unobservable Inputs (Level 3)
The reconciliation of our assets measured at fair value on a recurring basis using unobservable inputs (Level 3) is as follows:
(Dollars in thousands)
Auction Rate
Securities
Balance at December 31, 2011
$
25,960

Cash received for redemptions at par
(25,438
)
Reclassified from other comprehensive income
2,723

Reported in earnings
(3,245
)
Balance at June 30, 2012
$