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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment, Net [Abstract]  
PROPERTY AND EQUIPMENT, NET PROPERTY AND EQUIPMENT, NET
December 31,
20192018
Cost:
Computers and peripheral equipment
$263,128  $253,325  
Internal use software
105,297  69,452  
Office furniture and equipment
13,180  13,060  
Leasehold improvements
59,199  57,454  
440,804  393,291  
Accumulated depreciation:
Computers and peripheral equipment
212,471  196,820  
Internal use software
41,622  16,597  
Office furniture and equipment
8,655  7,717  
Leasehold improvements
36,409  31,819  
299,157  252,953  
Depreciated cost
$141,647  $140,338  

Depreciation expense totaled $60,174, $49,963 and $37,924 for the years 2019, 2018 and 2017, respectively.
The Company recorded a reduction of $18,653 and $11,485 to the cost and accumulated depreciation of fully depreciated equipment and leasehold improvements no longer in use for the years ended December 31, 2019 and 2018, respectively.