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Significant Accounting Policies (Tables)
12 Months Ended
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 31,202020192018
Balance at beginning of period$60,465 $43,491 $39,176 
    Additions: charges to bad debt expense44,707 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