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Additional Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Additional Cash Flow Information [Abstract]  
Changes in operating assets and liabilities
Changes in operating assets and liabilities, net of effects of businesses acquired consists of the following:

 
 
Years ended December 31,
 
 
 
2017
  
2016
  
2015
 
 
         
Accounts receivable
 
$
(51,152
)
 
$
(4,120
)
 
$
(11,250
)
Inventories
  
(55,062
)
  
13,760
   
(30,302
)
Prepaid expenses and other current assets
  
(3,668
)   
(12,180
)
  
(5,203
)
Accounts payable
  
42,291
   
17,839
   
(13,419
)
Other current liabilities
  
21,184
   
(19,505
)
  
32,925
 
Net change in operating assets and liabilities
 
$
(46,407
)
 
$
(4,206
)
 
$
(27,249
)