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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]  
PROPERTY AND EQUIPMENT, NET PROPERTY AND EQUIPMENT, NET
December 31,
20202019
Cost:
Computers and peripheral equipment
$192,898 $187,405 
Internal use software
145,914 105,297 
Office furniture and equipment
10,417 9,943 
Leasehold improvements
56,976 55,599 
406,205 358,244 
Accumulated depreciation:
Computers and peripheral equipment
147,618 136,748 
Internal use software
75,743 41,622 
Office furniture and equipment
6,733 5,418 
Leasehold improvements
38,326 32,809 
268,420 216,597 
Depreciated cost
$137,785 $141,647 

Depreciation expense totaled $67,892, $60,174 and $49,963 for the years 2020, 2019 and 2018, respectively.
The Company recorded a reduction of $22,355 and $18,653 to the cost and accumulated depreciation of fully depreciated equipment and leasehold improvements no longer in use for the years ended December 31, 2020 and 2019, respectively.