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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Carrying value of property leased or held for lease to others (in thousands)

 

Construction aggregates property

  $ 35,294  
Commercial property     440,083  
      475,377  
less accumulated depreciation and depletion     93,581  
    $ 381,796