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Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]  
Schedule Of Trade Accounts Receivables Net
Accounts receivable – trade, net consisted of the following:
 
 
December 31,
 
2017
 
2016
Accounts receivable - trade
$
503,917

 
$
231,187

Allowance for doubtful accounts
(8,468
)
 
(6,505
)
Accounts receivable - trade, net
$
495,449

 
$
224,682
Schedule Of Allowance For Doubtful Accounts
The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
 
 
December 31,
 
2017
 
2016
 
2015
Balance at beginning of period
$
6,505

 
$
1,446

 
$
2,973

Charged to costs and expenses
2,001

 
6,463

 
1,242

Amounts written off
(38
)
 
(1,404
)
 
(2,769
)
Balance at end of period
$
8,468

 
$
6,505

 
$
1,446