Fair Value Measurements (Tables)

3 Months Ended

Mar. 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

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, 2015		Level 1	Level 2		Level 3
Foreign currency contracts	473		—	473		—
Copper derivative contracts	290		—	290		—
Interest rate swap	(128	)	—	(128	)	—

(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	)	—