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Financial Instruments Measured at Fair Value and Concentrations of Credit Risk (Tables)

3 Months Ended

Mar. 31, 2021

Summary of Fair Value Measurements and Financial Statement Presentation

The fair values of our financial instruments measured at fair value and their respective levels in the fair value hierarchy as of March 31, 2021, and December 31, 2020, were as follows:

	March 31, 2021								March 31, 2021
	Fair Values of Assets								Fair Values of Liabilities
In Thousands	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Other items reported at fair value:
Short-term investments	$	3,045	$	—	$	—	$	3,045	$	—	$	—	$	—	$	—
Commodity derivative contracts		266		—		—		266		—		—		—		—
Total	$	3,311	$	—	$	—	$	3,311	$	—	$	—	$	—	$	—

	December 31, 2020								December 31, 2020
	Fair Values of Assets								Fair Values of Liabilities
In Thousands	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Other items reported at fair value:
Short-term investments	$	11,698	$	—	$	—	$	11,698	$	—	$	—	$	—	$	—
Commodity derivative contracts		467		—		—		467		—		—		—		—
Total	$	12,165	$	—	$	—	$	12,165	$	—	$	—	$	—	$	—

Composition of Short-term Investments

The composition of our short-term investments as of March 31, 2021, and December 31, 2020 were as follows:

	As of March 31,		As of December 31,
In Thousands	2021		2020
Corporate debt securities	$	3,045	$	11,698