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Additional Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
 
 
2018
  
2017
  
2016
 
 
         
Accounts receivable
 
$
(62,433
)
 
$
(51,152
)
 
$
(4,120
)
Inventories
  
(80,182
)
  
(55,062
)
  
13,760
 
Prepaid expenses and other current assets
  
(11,670
)
  
(3,668
)
  
(12,180
)
Accounts payable
  
(2,277
)
  
42,291
   
17,839
 
Other current liabilities
  
54,745
   
21,184
   
(19,505
)
Net change in operating assets and liabilities
 
$
(101,817
)
 
$
(46,407
)
 
$
(4,206
)