Derivatives Hedges and Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017:

				Fair Value Measurements at December 31, 2018 Using
Description	Total Fair Value at December 31, 2018			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, 2017
	(In Thousands)
Assets - Supplies, prepaid items and other:
Other	$	533		$	—	$	—	$	533		$	—
Total	$	533		$	—	$	—	$	533		$	—

Liabilities - Current and noncurrent accrued and other liabilities:
Embedded derivative	$	(1,642	)	$	—	$	—	$	(1,642	)	$	(2,660	)
Other		(533	)		—		—		(533	)		—
Total	$	(2,175	)	$	—	$	—	$	(2,175	)	$	(2,660	)

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
	2018			2017			2016			2018			2017			2016
	(In Thousands)
Beginning balance	$	—		$	—		$	1,154		$	(2,660	)	$	(2,557	)	$	(1,154	)
Transfers into Level 3		—			—			—			—			—			(5,817	)
Transfers out of Level 3		—			—			—			—			—			—

Total realized and unrealized gains (losses) included in operating results		2,214			2,031			1,256			(606	)		(1,690	)		802
Purchases		—			—			—			—			—			—
Issuances		—			—			—			(229	)		—			—
Sales		(1,681	)		(2,031	)		(2,410	)		—			—			—
Settlements		—			—			—			1,320			1,587			3,612
Ending balance	$	533		$	—		$	—		$	(2,175	)	$	(2,660	)	$	(2,557	)

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	$	533		$	—		$	—		$	(1,780	)	$	(103	)	$	(983	)

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

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

	2018		2017			2016
	(In Thousands)
Total net gains (losses) included in operating results:
Cost of sales - Undesignated commodities contracts	$	—	$	—		$	140
Cost of sales - Undesignated foreign exchange contracts		—		—			5
Other income, net - Other		361		444			532
Non-operating other income (expense) - embedded derivative		1,247		(103	)		(983	)
Total net gains (losses) included in operating results	$	1,608	$	341		$	(306	)