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Deferred tax assets and deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
 Property and equipment $ 38,143 $ 56,314 $ 49,932
 Investment in opportunity zone 30,846 0 0
 Depletion 704 708 718
 Unrealized rents 58 27 27
 Prepaid expenses 36 50 76
  Gross deferred tax liabilities 69,787 57,099 50,753
 Federal tax loss carryforwards 3,235 0 0
 State tax loss carryforwards 1,388 0 0
 Employee benefits and other 1,117 993 642
Gross deferred tax assets 5,740 993 642
Net deferred tax liability $ 64,047 $ 56,106 $ 50,111