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Accounts Receivable
12 Months Ended
Dec. 31, 2014
Accounts Receivable, Net [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable consist of the following at December 31:
 
 
2014
 
2013
Trade customers
 
$
525,546

 
$
410,302

Affiliates
 
437

 
315

Allowance for doubtful accounts
 
(13,468
)
 
(11,741
)
 
 
512,515

 
398,876

Federal and state taxes
 
8,919

 
20,820

Other
 
39,232

 
8,761

Accounts receivable, net
 
$
560,666

 
$
428,457