Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Cash Flow Hedging Instruments Fair Value and Balance Sheet Location

	Asset Derivatives			Liability Derivatives
	Location	Fair  Value		Location	Fair  Value
As of December 31, 2014	(Dollars in Thousands)
Derivatives designated as cash flow hedges:
Foreign currency derivatives	Prepaid and other current assets	$	722	Other current liabilities	$	1,234
Commodity derivative contracts	Prepaid and other current assets	—		Other current liabilities	7,067
Total fair value		$	722		$	8,301
As of March 31, 2015
Derivatives designated as cash flow hedges:
Foreign currency derivatives	Prepaid and other current assets	$	2,211	Other current liabilities	$	1,108
Commodity derivative contracts	Prepaid and other current assets	44		Other current liabilities	1
Total fair value		$	2,255		$	1,109

Schedule Of Fair Value Of Derivatives Designated As Fair Value Hedges

	Asset Derivatives			Liability Derivatives
	Location	Fair  Value		Location	Fair  Value
As of December 31, 2014	(Dollars in Thousands)
Derivatives not designated as hedges:
Foreign currency derivatives	Prepaid and other current assets	$	80	Other current liabilities	$	428
Total fair value		$	80		$	428
As of March 31, 2015
Derivatives not designated as hedges:
Foreign currency derivatives	Prepaid and other current assets	$	17	Other current liabilities	$	325
Total fair value		$	17		$	325

Schedule Of Realized (Gains) Losses On Derivatives Recognized In Statement Of Income

The location and amount of realized (gains) losses on derivatives are recognized in the Statements of Operations when the hedged item impacts earnings and are as follows for the three and three months ended March 31, 2014 and 2015:

		Amount of (Gain)/Loss Recognized (Effective Portion)
Three Months Ended March 31,	Location of (Gain)/Loss Reclassified from Other Comprehensive Income (Effective Portion)	2014		2015
		(Dollars in Thousands)
Derivatives designated as cash flow hedges:
Foreign currency derivatives, excluding tax   of ($4) and $71, respectively	Cost of goods sold/Other expense / (income) / Revenue	$	301	$	(712	)
Commodity forward derivatives, excluding   tax of ($190) and ($97), respectively	Cost of goods sold / Revenue	$	529	$	265

		Amount of (Gain)/Loss Recognized
Three Months Ended March 31,	Location of (Gain)/Loss Recognized in the Consolidated Statement of Operations	2014			2015
		(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivatives	Cost of goods sold/Other expense (income)	$	(191	)	$	889