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Accounts Receivable | 12 Months Ended
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Dec. 31, 2011
Accounts Receivable | Note 2: Accounts Receivable Accounts receivable, net consists of the following:
December 31, |  | 2011 |  |  | 2010 |
(in thousands) |  |  |  |  |  |
Trade receivables: |  |  |  |  |  |
Billed |  | $ | 367,718 |  |  | $ | 216,201 |
Unbilled |  |  | 99,913 |  |  |  | 84,977 |
Other receivables |  |  | 1,734 |  |  |  | 1,519 |
Total |  |  | 469,365 |  |  |  | 302,697 |
Less: allowance for doubtful accounts |  |  | (8,093 | ) |  |  | (8,695 | )
Accounts receivable, net |  | $ | 461,272 |  |  | $ | 294,002 |
Trade receivables relate to sale of our services and products, for which credit is extended based on our evaluation of the customer’s credit worthiness. Unbilled receivables represent revenues earned but not billed to the customer until future dates, usually within one month. Other receivables consist primarily of amounts due from purchasers of Company property and rebates from suppliers. Changes in the Company’s allowance for doubtful accounts are as follows:
Years Ended December 31, |  | 2011 |  |  | 2010 |
(in thousands) |  |  |  |  |  |
Beginning balance |  | $ | 8,695 |  |  | $ | 3,210 |
Bad debt expense |  |  | 2,868 |  |  |  | 4,812 |
Accounts written-off |  |  | (3,820 | ) |  |  | (730 | )
Recoveries |  |  | 350 |  |  |  | 1,403 |
Ending balance |  | $ | 8,093 |  |  | $ | 8,695

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- Definition The entire disclosure for claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables. + References Reference 1: 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=6965416&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6965416&loc=d3e5162-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 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=6881521&loc=d3e23780-122690 Reference 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph k Reference 9: 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=6965416&loc=d3e5074-111524 + Details
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