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Receivables (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance. An alternative caption includes allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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