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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2016
Reconciliation of the Allowance for Doubtful Accounts |
Schedule of reconciliation of the allowance for doubtful accounts | A reconciliation of the beginning and ending balances of the allowance for doubtful accounts is as follows (in thousands):
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Balance, beginning of the period | $ | 606 |  |  | $ | 349 |  |  | $ | 408 |
Charges to earnings | 515 |  |  | 337 |  |  | 206 |
Write-off of uncollectible accounts receivable | (62 | ) |  | (80 | ) |  | (265 | )
Balance, end of the period | $ | 1,059 |  |  | $ | 606 |  |  | $ | 349 |
Schedule of depreciation period for each asset category | The following table presents the estimated useful lives for each asset category:
Asset Category | Estimated Useful Lives
Land | N/A
Building | 34 years
Site Improvements | 1 to 15 years
Computer equipment and capitalized software | 1 to 5 years
Leasehold improvements | Lesser of asset life or life of lease
Furniture and other equipment | 3 to 7 years
Aircraft and automobile | 5 to 10 years

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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