Subsequent Events (Details) - USD ($)		9 Months Ended
	Oct. 05, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 06, 2021	Aug. 10, 2021	Dec. 31, 2020	May 03, 2019
Subsequent Event [Line Items]
Senior Notes		$ 400,000,000			$ 400,000,000	$ 0
Senior Notes, Interest Rate		925.00%
Senior Notes Redemption Percentage					99.018%
Repayments of 2nd Lien Term		$ 56,890,000	$ 0
Common stock, par value (in USD per share)		$ 0.01				$ 0.01
Common stock, shares authorized (in shares)		110,000,000				110,000,000
Revolving Credit Facility
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 375,000,000					$ 1,000,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Merger shares	0.51
Penn Virginia Ownership of Combined Company	87.00%
Lonestar Ownership of Combined Company	13.00%
Senior Notes, Interest Rate	925.00%
Share Price	$ 30.19
Merger, Value of shares	$ 173,600,000
Repayments of 2nd Lien Term	146,200,000
Repayments of Lonestar's debt	249,800,000
Derivative restructuring fees	50,000,000
Escrow Funds Released	$ 411,500,000
Juniper Ownership of Combined Company	52.00%
Subsequent Event [Member] | Revolving Credit Facility
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000,000
Line of Credit Facility, Commitment Fee Amount	$ 400,000,000
Subsequent Event [Member] | Common Class B
Subsequent Event [Line Items]
Common stock, par value (in USD per share)				$ 0.01
Common stock, shares authorized (in shares)				30,000,000
Subsequent Event [Member] | Common Class A
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)				145,000,000