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Income taxes - Schedule of Differences in Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]      
Income before income taxes $ 223,618 $ 202,378 $ 79,692
Income tax expense at applicable statutory Greek Federal tax rate, 22% 49,196 44,523 17,532
Foreign tax rate differences (182) (502) (295)
State income taxes, net of federal tax effect 9,962 8,092 2,460
Mineral deposit depletion (3,917) (5,128) (3,422)
Unrecognized deferred tax assets 1,514 0 0
Other 971 149 696
Income tax expense $ 57,544 $ 47,134 $ 16,971
Effective tax rate 25.70% 23.30% 21.30%