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Receivables | 12 Months Ended
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Dec. 31, 2018
Accounts Receivable, Net, Current [Abstract] |
Receivables | Receivables 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 |
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 |

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