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Receivables | 12 Months Ended
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Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |
Receivables | Receivables Accounts receivable – trade, net consisted of the following:
| December 31,
| 2019 |  | 2018
Accounts receivable - trade | $ | 418,064 |  |  | $ | 330,855 |
Allowance for doubtful accounts | (1,062 | ) |  | (7,393 | )
Accounts receivable - trade, net | $ | 417,002 |  |  | $ | 323,462 |
The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
| December 31,
| 2019 |  | 2018 |  | 2017
Balance at beginning of period | $ | 7,393 |  |  | $ | 8,468 |  |  | $ | 6,505 |
Charged to costs and expenses, net of recoveries | (5,572 | ) |  | 31 |  |  | 2,001 |
Amounts written off | (759 | ) |  | (1,106 | ) |  | (38 | )
Balance at end of period | $ | 1,062 |  |  | $ | 7,393 |  |  | $ | 8,468 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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