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CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE
 9 Months Ended
Sep. 30, 2016
CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE  
CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE

(4) CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE

Our primary market areas are located in the United States along the Gulf Coast, in the Southeast, in Brownsville, Texas, along the Mississippi and Ohio Rivers, and in the Midwest. We have a concentration of trade receivable balances due from companies engaged in the trading, distribution and marketing of refined products and crude oil. These concentrations of customers may affect our overall credit risk in that the customers may be similarly affected by changes in economic, regulatory or other factors. Our customers’ historical financial and operating information is analyzed prior to extending credit. We manage our exposure to credit risk through credit analysis, credit approvals, credit limits and monitoring procedures, and for certain transactions we may request letters of credit, prepayments or guarantees. We maintain allowances for potentially uncollectible accounts receivable.

Trade accounts receivable, net consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

    

September 30,

    

December 31,

 

 

 

2016

 

2015

 

Trade accounts receivable

 

$
9,114

 

$
6,448

 

Less allowance for doubtful accounts

 

 
(119)

 

 
(475)

 

 

 

$
8,995

 

$
5,973

 

 

The following customers accounted for at least 10% of our consolidated revenue in at least one of the periods presented in the accompanying consolidated statements of operations:

 

 

 

 

 

 

 

 

    

Three months ended 

 

 

 

September 30,

 

 

 

2016

 

2015

 

NGL Energy Partners LP

 
22

%  
24

%

Castleton Commodities International LLC

 
15

%  

 —

%

RaceTrac Petroleum Inc.

 
13

%  
13

%

Morgan Stanley Capital Group

 

 —

%  
13

% 

 

 

On October 27, 2015, upon the sale of Morgan Stanley’s global physical oil merchanting business to Castleton Commodities International LLC, Morgan Stanley Capital Group, with our consent, assigned all its terminaling services agreements with us to Castleton Commodities International LLC.