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Accounts Receivable
6 Months Ended
Jun. 30, 2016
Accounts Receivable, Net [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable consist of the following:
 
 
June 30,
2016
 
December 31,
2015
Trade customers
 
$
507,690

 
$
438,538

Allowance for doubtful accounts
 
(14,534
)
 
(14,095
)
 
 
493,156

 
424,443

Federal and state taxes
 
69,183

 
60,748

Other
 
20,516

 
23,341

Accounts receivable, net
 
$
582,855

 
$
508,532