Earnings per share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 37,272	$ (3,043)		$ 33,176
Less net income (loss) attributable to non-controlling interest - ENE Onshore	28,571		$ 891	26,924	$ 26,924	$ 2,152
Net income attributable to shareholders - basic	8,828		$ 0	6,797	$ 6,797	$ 0
Net income attributable to shareholders - diluted	$ 8,828			$ 6,797
Weighted average shares outstanding - basic	26,254,167		0	26,254,167	26,254,167	0
Dilutive effect of unvested restricted common stock	6,694			6,006
Issued upon assumed exercise of outstanding stock options	0			0
Class B Common Stock converted to Class A Common Stock	0			0
Weighted average shares outstanding - diluted	26,260,861		0	26,260,173	26,260,173	0
Earnings Per Share, Basic [Abstract]
Basic	$ 0.34		$ 0	$ 0.26	$ 0.26	$ 0
Diluted	$ 0.34		$ 0	$ 0.26	$ 0.26	$ 0
ENE Onshore [Member]
Less net income (loss) attributable to non-controlling interest - ENE Onshore	$ (127)		$ (1,412)	$ (545)	$ (545)	$ (5,348)