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Leases (Tables)
12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Carrying value of property leased or held for lease to others (in thousands)

 

Construction aggregates property

  $ 35,093  
Commercial property     61,823  
      96,916  
less accumulated depreciation and depletion     14,813  
    $ 82,103