Derivatives (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Assets and Liabilities at Fair Value [Table Text Block]

The following table provides the fair values of our derivative financial instruments for the periods presented:

	Asset Derivatives:
(dollars in thousands)	March 31, 2014			December 31, 2013
Derivatives designated as hedging instruments under FASB ASC 815:	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Natural gas contracts	Prepaid and other current assets	$	573	Prepaid and other current assets	$	394
Natural gas contracts	Other assets	5		Other assets	19
Total designated		578			413
Total		$	578		$	413
	Liability Derivatives:
(dollars in thousands)	March 31, 2014			December 31, 2013
Derivatives designated as hedging instruments under FASB ASC 815:	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Interest rate contract	Derivative liability - current	$	1,537	Derivative liability - current	$	—
Interest rate contract	Other long-term liabilities	—		Other long-term liabilities	1,866
Total designated		1,537			1,866
Derivatives not designated as hedging instruments under FASB ASC 815:
Interest rate contract	Derivative liability - current	107		Derivative liability - current	—
Interest rate contract	Other long-term liabilities	—		Other long-term liabilities	207
Total undesignated		107			207
Total		$	1,644		$	2,073

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]

The following table provides a summary of the effective portion of derivative gain (loss) reclassified from accumulated other comprehensive loss to the Condensed Consolidated Statements of Operations:

		Three months ended March 31,
(dollars in thousands)		2014		2013
Derivative:	Location:
Natural gas contracts	Cost of sales	$	465	$	(246	)
Total impact on net income (loss)		$	465	$	(246	)

The following table provides a summary of the gain (loss) recognized on the Condensed Consolidated Statements of Operations from the designated portion of our Rate Agreement:

	Three months ended March 31,
(dollars in thousands)	2014			2013
Interest rate swap - designated	$	329		$	(356	)
Related long-term debt	(359		)	134
Net impact in other income (expense)	$	(30	)	$	(222	)

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

The following table provides a summary of the effective portion of derivative gain (loss) recognized in other comprehensive income (loss):

	Three months ended March 31,
(dollars in thousands)	2014		2013
Derivatives in Cash Flow Hedging relationships:
Natural gas contracts	$	630	$	967
Total	$	630	$	967

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Gains (losses) on derivatives that were not designated as hedging instruments are recorded in current earnings as follows:

		Three months ended March 31,
(dollars in thousands)		2014		2013
Derivative:	Location:
Currency contracts	Other income (expense)	$	—	$	251
Total		$	—	$	251