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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Changes in Allowance for Uncollectible Trade Accounts Receivables
Changes in this allowance for 2020, 2019 and 2018 were as follows (in thousands):
 Years Ended December 31, 
 202020192018 
Balance at beginning of year$8,929 $10,126 $9,015  
Charged to costs and expenses1,194 139 2,368  
Charged to other accounts21 
(1)
79 
(1)
(86)
(2)
Deductions(1,516)
(3)
(1,415)
(3)
(1,171)
(3)
Balance at end of year$8,628  $8,929  $10,126  
(1) Primarily due to translation adjustments
(2) Includes allowance for doubtful accounts from acquisitions and divestiture
(3) Uncollectible accounts written off, net of recoveries
Schedule of Principal Estimated Useful Lives of Property and Equipment
The principal estimated useful lives used in determining depreciation are as follows:
Buildings
20-39 years
Building improvements
10-20 years
Furniture, fixtures and equipment
3-20 years
Leasehold improvementsShorter of estimated useful life or related lease term