Derivatives, Hedges, Financial Instruments and Carbon Credits (Tables)

6 Months Ended

Jun. 30, 2014

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following details our assets and liabilities that are measured at fair value on a recurring basis at June 30, 2014 and December 31, 2013:

			Fair Value Measurement at
			June 30, 2014 Using
Description	Total Fair Value At June 30, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value at December 31, 2013
					(In Thousands)
Assets—Supplies, prepaid items and other:
Commodities contracts	$	124	$	—	$	124	$	—	$	31
Carbon credits		1,673		—		—		1,673		1,284
Total	$	1,797	$	—	$	124	$	1,673	$	1,315
Liabilities—Current and noncurrent accrued and other liabilities:
Contractual obligations—carbon credits	$	1,673		—		—		1,673		1,284
Interest rate contract		976		—		976		—		1,240
Total	$	2,649	$	—	$	976	$	1,673	$	2,524

Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis

the following is a reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	Assets						Liabilities						Assets				Liabilities
	Six Months Ended						Six Months Ended						Three Months Ended				Three Months Ended
	June 30,						June 30,						June 30,				June 30,
	2014			2013			2014			2013			2014		2013		2014			2013
	(In Thousands)
Beginning balance	$	1,284		$	91		$	(1,284	)	$	(91	)	$	1,673	$	312	$	(1,673	)	$	(312	)
Transfers into Level 3		—			—			—			—			—		—		—			—
Transfers out of Level 3		—			—			—			—			—		—		—			—
Total realized and unrealized gains (losses) included in earnings		1,925			546			(1,634	)		(546	)		—		313		—			(313	)
Purchases		—			—			—			—			—		—		—			—
Issuances		—			—			—			—			—		—		—			—
Sales		(1,536	)		(12	)		—			—			—		—		—			—
Settlements		—			—			1,245			12			—		—		—			—
Ending balance	$	1,673		$	625		$	(1,673	)	$	(625	)	$	1,673	$	625	$	(1,673	)	$	(625	)
Total gains (losses) for the period included in earnings results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date	$	1,004		$	534		$	(1,004	)	$	(534	)	$	—	$	313	$	—		$	(313	)

Net Gains (Losses) Included in Earnings and the Income Statement Classifications

Net gains (losses) included in earnings and the income statement classifications are as follows:

	Six Months Ended						Three Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
	(In Thousands)
Total net gains (losses) included in earnings:
Cost of sales—Undesignated commodities contracts	$	2,111		$	(275	)	$	(105	)	$	(113	)
Other income—Carbon credits		1,925			546			—			313
Other expense—Contractual obligations relating to carbon credits		(1,634	)		(546	)		—			(313	)
Interest expense—Undesignated interest rate contract		(57	)		89			(37	)		88
	$	2,345		$	(186	)	$	(142	)	$	(25	)