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Receivables (Tables)
 12 Months Ended
Dec. 31, 2018
Accounts Receivable, Net, Current [Abstract]  
Schedule of Trade Accounts Receivables Net
Accounts receivable – trade, net consisted of the following:
 
 
December 31,
 
2018
 
2017
Accounts receivable - trade
$
330,855

 
$
503,917

Allowance for doubtful accounts
(7,393
)
 
(8,468
)
Accounts receivable - trade, net
$
323,462

 
$
495,449
Schedule of Allowance For Doubtful Accounts
The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
 
 
December 31,
 
2018
 
2017
 
2016
Balance at beginning of period
$
8,468

 
$
6,505

 
$
1,446

Charged to costs and expenses, net of recoveries
31

 
2,001

 
6,463

Amounts written off
(1,106
)
 
(38
)
 
(1,404
)
Balance at end of period
$
7,393

 
$
8,468

 
$
6,505