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Receivables
 12 Months Ended
Dec. 31, 2014
Accounts Receivable, Net, Current [Abstract]  
Receivables
Receivables
Accounts receivable – trade, net consisted of the following:
 
 
December 31,
 
2014
 
2013
Accounts receivable - trade
$
274,502

 
$
369,559

Allowance for doubtful accounts
(2,973
)
 
(1,526
)
Accounts receivable - trade, net
$
271,529

 
$
368,033


The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
 
 
December 31,
 
2014
 
2013
 
2012
Balance at beginning of period
$
1,526

 
$
2,372

 
$
1,044

(Credited) charged to costs and expenses
1,447

 
(86
)
 
2,096

Amounts written off
—

 
(760
)
 
(768
)
Balance at end of period
$
2,973

 
$
1,526

 
$
2,372