Long-term debt, net - Narrative (Details)			12 Months Ended
	Mar. 28, 2018 USD ($) redetermination	Dec. 08, 2017 USD ($)	Dec. 08, 2021	Dec. 08, 2020	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Number of available interim unscheduled redeterminations | redetermination	1
Consecutive semiannual redeterminations | redetermination	2
Total debt					$ 360,000,000	$ 294,000,000
Amortized debt issuance costs and discounts					$ 1,900,000	2,100,000	$ 300,000
Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Weighted-average interest rate (as a percent)					4.60%
Credit facility - maximum borrowing capacity	$ 500,000,000
Credit facility - borrowing base					$ 340,000,000
Total debt					$ 260,000,000
Maximum cash dividend distributions	$ 25,000,000.0
Unused borrowing capacity	20.00%
Total debt ratio, maximum	3.5
Working capital ratio, minimum					1.0
Leverage ratio maximum	3.25				4.0
Minimum | Base Rate | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Minimum | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.00%
Maximum | Base Rate | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.00%
Maximum | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	3.00%
Second Lien Notes | Senior Notes
Line of Credit Facility [Line Items]
Total debt					$ 100,000,000	$ 100,000,000
Second Lien Notes | Senior Notes | Rosehill Operating
Line of Credit Facility [Line Items]
Leverage ratio maximum		4.00
Aggregate principal amount		$ 100,000,000
Interest rate		10.00%
Redemption price (as a percent)		101.00%
Second Lien Notes | Senior Notes | Forecast | Rosehill Operating
Line of Credit Facility [Line Items]
Redemption price (as a percent)			101.50%	103.00%
Series B Preferred Stock | Credit Agreement
Line of Credit Facility [Line Items]
Working capital ratio, minimum					2.5
Leverage ratio maximum					4.0
Series B Preferred Stock | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum cash dividend distributions	$ 25,000,000.0
Series A Preferred Stock | Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum cash dividend distributions	$ 8,000,000.0