Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

	Asset Derivatives			Liability Derivatives
	Location	Fair  Value		Location	Fair  Value
As of December 31, 2013	(Dollars in Thousands)
Derivatives designated as cash flow hedges:
Foreign currency derivatives	Other receivables	$	772	Other payables	$	1,185
Commodity derivative contracts	Other current assets	834		Other current liabilities	—
Total fair value		$	1,606		$	1,185
As of June 30, 2014
Derivatives designated as cash flow hedges:
Foreign currency derivatives	Other receivables	$	364	Other payables	$	198
Commodity derivative contracts	Other current assets	314		Other current liabilities	—
Total fair value		$	678		$	198

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, 2013	(Dollars in Thousands)
Derivatives not designated as hedges:
Foreign currency derivatives	Other receivables	$	328	Other payables	$	24
Total fair value		$	328		$	24
As of June 30, 2014
Derivatives not designated as hedges:
Foreign currency derivatives	Other receivables	$	230	Other payables	$	200
Total fair value		$	230		$	200

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

		Amount of (Gain)/Loss Recognized (Effective Portion)
Six Months Ended June 30,	Location of (Gain)/Loss Reclassified from Other Comprehensive Income (Effective Portion)	2013			2014
		(Dollars in Thousands)
Derivatives designated as cash flow hedges:
Foreign currency derivatives, excluding tax   of $19 and ($33), respectively	Cost of goods sold/Other expense / (income) / Revenue	$	(190	)	$	328
Commodity forward derivatives, excluding   tax of ($50) and ($9), respectively.	Cost of goods sold / Revenue	$	137		$	26

		Amount of (Gain)/Loss Recognized
Six Months Ended June 30,	Location of (Gain)/Loss Recognized in the Consolidated Statement of Operations	2013			2014
		(Dollars in thousands)
Derivatives not designated as hedges:
Foreign currency derivatives	Cost of goods sold/Other expense (income)	$	(1,421	)	$	(61	)