Fair value measurements - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Total gross fair value	$ 24,181	$ 150,407
Net fair value presented on the consolidated balance sheets	4,495	99,336
Net fair value presented on the consolidated balance sheets	36,375	51,071
Liabilities:
Net fair value presented on the consolidated balance sheets	(16,537)	0
Net fair value presented on the consolidated balance sheets	152	0
Amounts offset	0	0
Net derivative asset positions	24,181	150,407
Level 1
Liabilities:
Net derivative asset positions	0	0
Level 2
Liabilities:
Net derivative asset positions	(8,846)	119,301
Level 3
Liabilities:
Net derivative asset positions	33,027	31,106
Commodity Derivatives
Assets:
Net fair value presented on the consolidated balance sheets	3,464	97,035
Net fair value presented on the consolidated balance sheets	4,379	22,266
Liabilities:
Net fair value presented on the consolidated balance sheets	(16,537)	0
Net fair value presented on the consolidated balance sheets	(152)
Contingent Consideration
Assets:
Net fair value presented on the consolidated balance sheets	1,031	2,301
Net fair value presented on the consolidated balance sheets	31,996	28,805
Current Assets | Commodity Derivatives
Assets:
Total gross fair value	17,101	106,067
Amounts offset	(13,637)	(9,032)
Current Assets | Commodity Derivatives | Level 1
Assets:
Total gross fair value	0	0
Current Assets | Commodity Derivatives | Level 2
Assets:
Total gross fair value	17,101	106,067
Current Assets | Commodity Derivatives | Level 3
Assets:
Total gross fair value	0	0
Current Assets | Contingent Consideration
Assets:
Total gross fair value	1,031	2,301
Amounts offset	0	0
Current Assets | Contingent Consideration | Level 1
Assets:
Total gross fair value	0	0
Current Assets | Contingent Consideration | Level 2
Assets:
Total gross fair value	0	0
Current Assets | Contingent Consideration | Level 3
Assets:
Total gross fair value	1,031	2,301
Noncurrent Assets | Commodity Derivatives
Assets:
Total gross fair value	3,925	22,266
Amounts offset		0
Amounts offset	454
Noncurrent Assets | Commodity Derivatives | Level 1
Assets:
Total gross fair value	0	0
Noncurrent Assets | Commodity Derivatives | Level 2
Assets:
Total gross fair value	3,925	22,266
Noncurrent Assets | Commodity Derivatives | Level 3
Assets:
Total gross fair value	0	0
Noncurrent Assets | Contingent Consideration
Assets:
Total gross fair value	31,996	28,805
Amounts offset	0	0
Noncurrent Assets | Contingent Consideration | Level 1
Assets:
Total gross fair value	0	0
Noncurrent Assets | Contingent Consideration | Level 2
Assets:
Total gross fair value	0	0
Noncurrent Assets | Contingent Consideration | Level 3
Assets:
Total gross fair value	31,996	28,805
Current Liabilities | Commodity Derivatives
Liabilities:
Total gross fair value, Current	(30,174)	(9,032)
Amounts offset, Current	13,637	9,032
Current Liabilities | Commodity Derivatives | Level 1
Liabilities:
Total gross fair value, Current	0	0
Current Liabilities | Commodity Derivatives | Level 2
Liabilities:
Total gross fair value, Current	(30,174)	(9,032)
Current Liabilities | Commodity Derivatives | Level 3
Liabilities:
Total gross fair value, Current	0	$ 0
Noncurrent Liabilities | Commodity Derivatives
Liabilities:
Total gross fair value, Noncurrent	302
Amounts offset, Noncurrent	(454)
Noncurrent Liabilities | Commodity Derivatives | Level 1
Liabilities:
Total gross fair value, Noncurrent	0
Noncurrent Liabilities | Commodity Derivatives | Level 2
Liabilities:
Total gross fair value, Noncurrent	302
Noncurrent Liabilities | Commodity Derivatives | Level 3
Liabilities:
Total gross fair value, Noncurrent	$ 0