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Receivables | 12 Months Ended
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Dec. 31, 2013
Accounts Receivable, Net, Current [Abstract] |
Receivables | 4. Receivables Accounts receivable – trade, net consisted of the following:
| December 31,
| 2013 |  | 2012
Accounts receivable - trade | $ | 369,559 |  |  | $ | 273,297 |
Allowance for doubtful accounts | (1,526 | ) |  | (2,372 | )
Accounts receivable - trade, net | $ | 368,033 |  |  | $ | 270,925 |
The following table presents the activity of our allowance for doubtful accounts for the periods indicated:
| December 31,
| 2013 |  | 2012 |  | 2011
Balance at beginning of period | $ | 2,372 |  |  | $ | 1,044 |  |  | $ | 1,307 |
(Credited) charged to costs and expenses | (86 | ) |  | 2,096 |  |  | 373 |
Amounts written off | (760 | ) |  | (768 | ) |  | (636 | )
Balance at end of period | $ | 1,526 |  |  | $ | 2,372 |  |  | $ | 1,044 |

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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/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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5162-111524 + Details
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