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Additional Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2020
Additional Cash Flow Information [Abstract]  
Changes in operating assets and liabilities
Changes in operating assets and liabilities, net of effects of businesses acquired, consist of the following:

   
Years ended December 31,
  
 
  
2020
    
2019
    
2018
  
 
                  
Accounts receivable
  
$
4,662
    
$
66,158
    
$
(62,433
)
Inventories
    
(24,204
)
    
18,762
      
(80,182
)
Prepaid expenses and other current assets
    
12,692
      
271
      
(11,670
)
Accounts payable
    
18,485
      
(43,791
)
    
(2,277
)
Other current liabilities
    
6,157
      
(52,929
)
    
54,745
  
Net change in operating assets and liabilities
  
$
17,792
    
$
(11,529
)
  
$
(101,817
)