Fair Value (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value of Derivatives

	Fair Value at										Fair Value at
Asset / (Liability (dollars in thousands)	December 31, 2013										December 31, 2012
	Level 1		Level 2			Level 3		Total			Level 1		Level 2			Level 3		Total
Commodity futures natural gas contracts	$	—	$	413		$	—	$	413		$	—	$	(420	)	$	—	$	(420	)
Currency contracts	—		—			—		—			—		41			—		41
Interest rate agreements	—		(2,073		)	—		(2,073		)	—		298			—		298
Net derivative asset (liability)	$	—	$	(1,660	)	$	—	$	(1,660	)	$	—	$	(81	)	$	—	$	(81	)

Total Derivative Position Recorded on Balance Sheet

The total derivative position is recorded on the Consolidated Balance Sheets as follows:

Asset / (Liability (dollars in thousands)	December 31, 2013			December 31, 2012
Prepaid and other current assets	$	394		$	41
Derivative asset	19			298
Derivative liability	—			(420		)
Other long-term liabilities	(2,073		)	—
Net derivative asset (liability)	$	(1,660	)	$	(81	)