Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2022

Accounting Policies [Abstract]

Schedule of cash, cash equivalents, and restricted cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash as reported within the Unaudited Condensed Consolidated Balance Sheets to “Cash, cash equivalents, and restricted cash at end of period” as reported within the Unaudited Condensed Consolidated Statements of Cash Flows:

In thousands	September 30, 2022		December 31, 2021
Cash and cash equivalents	$	519	$	3,671
Restricted cash for future asset retirement obligations	47,633		46,673
Total cash, cash equivalents, and restricted cash shown in the Unaudited Condensed Consolidated Statements of Cash Flows	$	48,152	$	50,344

Schedule of Earnings Per Share Basic and Diluted

The following table reconciles the weighted average shares used in the basic and diluted net income (loss) per common share calculations for the periods indicated:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
In thousands	2022	2021	2022	2021
Weighted average common shares outstanding – basic	51,182	51,094	51,512	50,807
Effect of potentially dilutive securities
Restricted stock, restricted stock units and performance stock units	664	908	615	—
Warrants	1,869	2,712	2,397	—
Weighted average common shares outstanding – diluted	53,715	54,714	54,524	50,807

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following outstanding securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net income (loss) per share, as their effect would have been antidilutive, as of the respective dates:

	September 30,
In thousands	2022	2021
Restricted stock, restricted stock units and performance stock units	63	1,255
Warrants	—	5,314
Employee Stock Purchase Plan	8	—