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Note 13 - Property and Equipment, Net
 9 Months Ended
Sep. 30, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]

13.  Property and Equipment, net

Balances of major classes of assets and total accumulated depreciation and depletion are included in property and equipment, net in the condensed consolidated balance sheets and were as follows:

(in thousands)

  

September 30, 2020

    

December 31, 2019

    

September 30, 2019

  

Equipment and vehicles

   $ 959,828     $ 947,687     $ 949,577  

Quarry property

     199,677       188,960       185,792  

Land and land improvements

     135,102       132,531       134,543  

Buildings and leasehold improvements

     122,119       122,316       112,940  

Office furniture and equipment

     72,675       67,991       66,791  

Property and equipment

     1,489,401       1,459,485       1,449,643  

Less: accumulated depreciation and depletion

     953,145       917,188       906,847  

Property and equipment, net

   $ 536,256     $ 542,297     $ 542,796