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Temporary tax differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
 Property and equipment $ 41,866 $ 38,143 $ 25,468
 Investment in opportunity zone 34,871 30,846 30,846
 Depletion 697 704 708
 Unrealized rents 150 58 27
 Prepaid expenses 31 36 50
  Gross deferred tax liabilities 77,615 69,787 57,099
 Federal tax loss carryforwards 6,375 3,235 0
 State tax loss carryforwards 2,359 1,388 0
 Employee benefits and other 921 1,117 993
Gross deferred tax assets 9,655 5,740 993
Net deferred tax liability $ 67,960 $ 64,047 $ 56,106