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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2020
SUPPLEMENTAL CASH FLOW INFORMATION
22. SUPPLEMENTAL CASH FLOW INFORMATION
Supplemental cash flow information was as follows:
 
Years Ended December 31,
   
2020
     
2019
     
2018
  
Interest paid
   
$
1,844
 
    $ 4,341      $ 3,065  
Income taxes net of refunds
   
$
70,889
 
    $ 70,095      $ 115,301  
Common stock issued for N&S Supply of Fishkill, Inc.
   
$
(161
) 
    $ 4,032        —    
Common stock issued for Peirce-Phelps, Inc.
      —        $ 58,344        —    
Common stock issued for Dunphey & Associates Supply Co., Inc.
      —        $ 6,891        —    
Common stock issued for Alert Labs, Inc.
      —          —        $ 6,846