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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of Balances of The Allowance For Doubtful Accounts | The reconciliations of the beginning and ending balances of the Allowance for doubtful accounts were as follows:
For the years ended December 31, | 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 60,465 |  |  | $ | 43,491 |  |  | $ | 39,176 |
Additions: charges to bad debt expense | 44,707 |  |  | 20,324 |  |  | 23,107 |
Deductions (a) | (28,478) |  |  | (3,350) |  |  | (18,792) |
Balance at end of period | $ | 76,694 |  |  | $ | 60,465 |  |  | $ | 43,491 |
(a) Deductions include accounts receivable written off against the allowance (net of recoveries), reclassifications, and foreign currency translation. The beginning and ending balances of the Allowance for doubtful accounts include the current portion, as shown on the face of Consolidated Balance Sheets, in addition to the noncurrent portion that is included in Notes receivable, net on the Consolidated Balance Sheets.
Schedule of Depreciation And Amortization Periods | Depreciation and amortization periods are as follows:
Buildings | 10-50 years
Furniture, equipment and software | 2-10 years
Leasehold improvements | 2-25 years

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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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