PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	December 31,
	2016		2017
Cost:
Computers and peripheral equipment	$	28,799	$	29,806
Office furniture and equipment		11,707		12,099
Leasehold improvements		3,395		3,553
		43,901		45,458
Accumulated depreciation:
Computers and peripheral equipment		27,104		28,295
Office furniture and equipment		10,501		10,723
Leasehold improvements		2,429		2,605
		40,034		41,623
Depreciated cost	$	3,867	$	3,835