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Receivables (Tables) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |  |  |
Schedule of Trade Accounts Receivables Net | Accounts receivable – trade, net consisted of the following:
| December 31,
| 2020 |  | 2019
Accounts receivable - trade | $ | 398,723 |  |  | $ | 418,064 |
Allowance for credit losses | (6,258) |  |  | (1,062) |
Accounts receivable - trade, net | $ | 392,465 |  |  | $ | 417,002 |
Schedule of Allowance For Credit Losses | The following table presents the activity of our allowance for credit losses for the periods indicated:
| December 31,
| 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 1,062 |  |  | $ | 7,393 |  |  | $ | 8,468 |
Charged to costs and expenses, net of recoveries | 5,504 |  |  | (5,572) |  |  | 31 |
Amounts written off | (308) |  |  | (759) |  |  | (1,106) |
Balance at end of period | $ | 6,258 |  |  | $ | 1,062 |  |  | $ | 7,393 |
Charged to costs and expenses, net of recoveries | $ 5,504 | $ (5,572) | $ 31

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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