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

3 Months Ended

Mar. 31, 2016

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 March 31, 2016 and December 31, 2015: 

				Fair Value Measurements at March 31, 2016 Using
Description	Total Fair Value at March 31, 2016			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, 2015
	(In Thousands)
Assets - Supplies, prepaid items and other:
Commodities contracts (1)	$	320		$	—	$	320		$	—		$	195
Carbon credits		1,214			—		—			1,214			1,154
Foreign exchange contracts		7			—		7			—			—
Total	$	1,541		$	—	$	327		$	1,214		$	1,349
Liabilities - Current and noncurrent accrued and    other liabilities:
Commodities contracts (1)	$	(320	)	$	—	$	(320	)	$	—		$	(202	)
Contractual obligations - carbon credits		(1,214	)		—		—			(1,214	)		(1,154	)
Embedded derivative		(5,817	)		—		(5,817	)		—			(3,308	)
Interest rate contracts		—			—		—			—			(126	)
Foreign exchange contracts		—			—		—			—			(6	)
Total	$	(7,351	)	$	—	$	(6,137	)	$	(1,214	)	$	(4,796	)

(1) At March 31, 2016 and December 31, 2015, $320,000 and $195,000, respectively, are subject to an agreement that allows net settlement of contracts; however, we have chosen to present the fair values of our commodities contracts under master netting agreements using a gross fair value presentation.

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
	Three Months Ended					Three Months Ended
	March 31,					March 31,
	2016		2015			2016			2015
	(In Thousands)
Beginning balance	$	1,154	$	2,779		$	(1,154	)	$	(2,779	)
Transfers into Level 3		—		—			—			—
Transfers out of Level 3		—		—			—			—
Total realized and unrealized gains (losses) included in    operating results		60		(30	)		(60	)		30
Purchases		—		—			—			—
Issuances		—		—			—			—
Sales		—		(33	)		—			—
Settlements		—		—			—			33
Ending balance	$	1,214	$	2,716		$	(1,214	)	$	(2,716	)
Total gains (losses) for the period included in operating    results attributed to the change in unrealized gains or    losses on assets and liabilities still held at the reporting    date	$	60	$	—		$	(60	)	$	—

Net Gains (Losses) Included in Operating Results and The Statement of Operations Classifications

Net gains (losses) included in operating results and the statement of operations classifications are as follows:

	Three Months Ended
	March 31,
	2016			2015
	(In Thousands)
Total net gains (losses) included in operating results:
Cost of sales - Undesignated commodities contracts	$	(17	)	$	(1,978	)
Cost of sales - Undesignated foreign exchange contracts		13			(93	)
Other income - Carbon credits		60			(30	)
Other expense - Contractual obligations relating to carbon    credits		(60	)		30
Non-operating other expense - embedded derivative		(2,509	)		—
Interest expense - Undesignated interest rate contracts		—			(31	)
Total net losses included in operating results	$	(2,513	)	$	(2,102	)

Schedule of Carrying Values and Estimated Fair Values of Financial Instruments

At March 31, 2016 and December 31, 2015, we did not have any financial instruments with fair values significantly different from their carrying amounts, except for the 7.75% Senior Secured Notes as shown below.

	March 31, 2016				December 31, 2015
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
	(In Millions)
7.75% Senior Secured Notes (1)	$	425	$	392	$	425	$	355

(1) Based on a quoted price of 92.25 at March 31, 2016 and 83.65 at December 31, 2015.