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

12 Months Ended

Dec. 31, 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 December 31, 2014 and 2013:

			Fair Value Measurements at December 31, 2014 Using
Description	Total Fair Value at December 31, 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	$	—	$	—	$	—	$	—	$	31
Carbon credits		2,779		—		—		2,779		1,284
Total	$	2,779	$	—	$	—	$	2,779	$	1,315
Liabilities - Current and noncurrent accrued and other liabilities:
Commodities contracts	$	2,440	$	316	$	2,124	$	—	$	—
Contractual obligations - carbon credits		2,779		—		—		2,779		1,284
Interest rate contracts		671		—		671		—		1,240
Foreign exchange contracts		44		—		44		—		—
Total	$	5,934	$	316	$	2,839	$	2,779	$	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
	2014			2013			2012			2014			2013			2012
	(In Thousands)
Beginning balance	$	1,284		$	91		$	42		$	(1,284	)	$	(91	)	$	(42	)
Transfers into Level 3		—			—			—			—			—			—
Transfers out of Level 3		—			—			—			—			—			—
Total realized and unrealized gains (losses) included in earnings		3,089			1,233			876			(2,799	)		(1,233	)		(721	)
Purchases		—			—			—			—			—			—
Issuances		—			—			—			—			—			—
Sales		(1,594	)		(40	)		(827	)		—			—			—
Settlements		—			—			—			1,304			40			672
Ending balance	$	2,779		$	1,284		$	91		$	(2,779	)	$	(1,284	)	$	(91	)
Total gains (losses) for the period included in earnings attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date	$	2,110		$	1,193		$	78		$	(2,110	)	$	(1,193	)	$	(78	)

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

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

	2014			2013			2012
	(In Thousands)
Total net gains (losses) included in earnings:
Cost of sales - Undesignated commodities contracts	$	(1,198	)	$	(244	)	$	14
Cost of sales - Undesignated foreign exchange contracts		(49	)		—			(19	)
Other income - Carbon credits		3,089			1,233			876
Other expense - Contractual obligations relating to carbon credits		(2,799	)		(1,233	)		(721	)
Interest expense - Undesignated interest rate contracts		(71	)		(33	)		(523	)
Total net losses included in earnings	$	(1,028	)	$	(277	)	$	(373	)