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Fair value measurements - Fair value of net derivative instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Assets (at fair value): |  |
Derivative instruments - commodity derivatives | $ 11,117 | $ 10,089
Commodity derivatives – noncurrent portion | 1,189 | 0
Liabilities (at fair value): |  |
Commodity derivatives – current portion | 0 | (431)
Fair Value |  |
Assets (at fair value): |  |
Equity investments | 50,427 | 0
Liabilities (at fair value): |  |
Warrant liability – noncurrent portion | 0 | (11,902)
Fair Value, Recurring |  |
Assets (at fair value): |  |
Equity investments | 50,427 |
Commodity derivatives - current portion - Net of fair value presented in CBS | 11,117 | 10,089
Commodity derivatives - noncurrent portion - Net of fair value presented in CBS | 1,189 |
Liabilities (at fair value): |  |
Commodity derivatives - current portion - Net fair value presented in CBS | 0 | (431)
US Derivative Liability, Non Current, Subject to Master Netting Arrangement, after Offset | 0 |
Net derivative instruments | 12,306 | 9,658
Fair Value, Recurring | Common Stock |  |
Assets (at fair value): |  |
Equity investments | 25,554 |
Fair Value, Recurring | Preferred Stock |  |
Assets (at fair value): |  |
Equity investments | 24,873 |
Fair Value, Recurring | Fair Value |  |
Assets (at fair value): |  |
Equity investments | 50,427 |
Derivative instruments - commodity derivatives | 14,202 | 20,197
Commodity derivatives - current portion offset in the Consolidated Balance Sheet | (3,085) | (10,108)
Commodity derivatives – noncurrent portion | 2,534 |
Commodity derivatives - Non-current portion offset in the Consolidated Balance Sheet | (1,345) |
Liabilities (at fair value): |  |
Commodity derivatives – current portion | (3,085) | (10,539)
Commodity derivatives - current portion - Offset in Consolidated Balance Sheet | 3,085 | 10,108
Commodity derivatives – noncurrent portion | (1,345) |
Warrant liability - noncurrent portion- Offset in the Consolidated Balance Sheet | 1,345 |
Warrant liability – noncurrent portion |  | (11,902)
Net derivative instruments | 12,306 | (2,244)
Fair Value, Recurring | Fair Value | Common Stock |  |
Assets (at fair value): |  |
Equity investments | 25,554 |
Fair Value, Recurring | Fair Value | Preferred Stock |  |
Assets (at fair value): |  |
Equity investments | 24,873 |
Fair Value, Recurring | Level 1 | Fair Value |  |
Assets (at fair value): |  |
Equity investments | 25,554 |
Derivative instruments - commodity derivatives | 0 | 0
Commodity derivatives – noncurrent portion | 0 |
Liabilities (at fair value): |  |
Commodity derivatives – current portion | 0 | 0
Commodity derivatives – noncurrent portion | 0 |
Warrant liability – noncurrent portion |  | (11,902)
Net derivative instruments | 0 | (11,902)
Fair Value, Recurring | Level 1 | Fair Value | Common Stock |  |
Assets (at fair value): |  |
Equity investments | 25,554 |
Fair Value, Recurring | Level 1 | Fair Value | Preferred Stock |  |
Assets (at fair value): |  |
Equity investments | 0 |
Fair Value, Recurring | Level 2 | Fair Value |  |
Assets (at fair value): |  |
Equity investments | 24,873 |
Derivative instruments - commodity derivatives | 14,202 | 20,197
Commodity derivatives – noncurrent portion | 2,534 |
Liabilities (at fair value): |  |
Commodity derivatives – current portion | (3,085) | (10,539)
Commodity derivatives – noncurrent portion | (1,345) |
Warrant liability – noncurrent portion |  | 0
Net derivative instruments | 12,306 | 9,658
Fair Value, Recurring | Level 2 | Fair Value | Common Stock |  |
Assets (at fair value): |  |
Equity investments | 0 |
Fair Value, Recurring | Level 3 | Fair Value |  |
Assets (at fair value): |  |
Equity investments | 0 |
Derivative instruments - commodity derivatives | 0 | 0
Commodity derivatives – noncurrent portion | 0 |
Liabilities (at fair value): |  |
Commodity derivatives – current portion | 0 | 0
Commodity derivatives – noncurrent portion | 0 |
Warrant liability – noncurrent portion |  | 0
Net derivative instruments | 0 | $ 0
Fair Value, Recurring | Level 3 | Fair Value | Common Stock |  |
Assets (at fair value): |  |
Equity investments | 0 |
Fair Value, Recurring | Level 3 | Fair Value | Preferred Stock |  |
Assets (at fair value): |  |
Equity investments | $ 0 |

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