Derivatives Hedges and Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

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 September 30, 2020 and December 31, 2019

			Fair Value Measurements at September 30, 2020 Using
Description	Total Fair Value at September 30, 2020		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)⁽¹⁾		Total Fair Value at December 31, 2019
	(In Thousands)

Assets - Supplies, prepaid items and other:
Natural gas contracts	$	623	$	—	$	623	$	—	$	—
Total	$	623	$	—	$	623	$	—	$	—

Liabilities - Current and noncurrent accrued and other liabilities:
Embedded derivative	$	468	$	—	$	—	$	468	$	1,084
Total	$	468	$	—	$	—	$	468	$	1,084

(1)

There was no Level 3 transfer activity for the nine months ended September 30, 2020.

Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes

At September 30, 2020 and December 31, 2019, we did not have any financial instruments with fair values significantly different from their carrying amounts (which excludes issuance costs, if applicable), except for the Senior Secured Notes as shown below.

	September 30, 2020				December 31, 2019
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
	(In Millions)
Senior Secured Notes (1)	$	435	$	426	$	435	$	449

(1)Based on a quoted price of 98.0 at September 30, 2020 and 103.25 at December 31, 2019.