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Receivables
 12 Months Ended
Dec. 31, 2013
Accounts Receivable, Net, Current [Abstract]  
Receivables
4. Receivables
Accounts receivable – trade, net consisted of the following:
 
 
December 31,
 
2013
 
2012
Accounts receivable - trade
$
369,559

 
$
273,297

Allowance for doubtful accounts
(1,526
)
 
(2,372
)
Accounts receivable - trade, net
$
368,033

 
$
270,925


The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
 
 
December 31,
 
2013
 
2012
 
2011
Balance at beginning of period
$
2,372

 
$
1,044

 
$
1,307

(Credited) charged to costs and expenses
(86
)
 
2,096

 
373

Amounts written off
(760
)
 
(768
)
 
(636
)
Balance at end of period
$
1,526

 
$
2,372

 
$
1,044