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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION
22. SUPPLEMENTAL CASH FLOW INFORMATIO
N
Supplemental cash flow information was as foll
o
ws
:
Years Ended December 31,
 
2019
 
  
2018
 
  
2017
 
Interest paid
 
$
4,341
 
   $
3,065
    $
5,773
 
Income taxes net of refunds
 
$
70,095
 
   $
115,301
    $
48,056
 
Common stock issued for N&S Supply of Fishkill, Inc.
 
$
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
      
—