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CUSTOMERS, GEOGRAPHIC AND SEGMENT INFORMATION (Schedule of Financial Data for Reportable Operating Segments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues $ 165,885 $ 263,492 $ 266,391
Cost of revenues 124,670 167,615 172,354
Gross profit (loss) 41,215 95,877 94,037
Research and development, net 26,303 30,184 33,023
Selling and marketing 16,871 21,488 22,706
General and administrative 14,063 18,515 17,024
Merger, acquisition and related litigation expenses (income), net (53,633) 118
Operating income (loss) 37,611 25,572 21,284
Financial expenses, net 1,907 2,617 4,298
Income before taxes 35,704 22,955 16,986
Taxes on income (benefit) 793 (13,583) (1,423)
Net income 34,911 36,538 18,409
Depreciation and amortization expenses 10,291 10,978 13,149
Fixed Networks [Member]      
Segment Reporting Information [Line Items]      
Revenues 92,671 127,265 144,208
Cost of revenues 61,939 80,038 93,745
Gross profit (loss) 30,732 47,227 50,463
Research and development, net 7,350 10,919 11,764
Selling and marketing 12,388 14,955 16,106
General and administrative 8,520 11,279 11,302
Merger, acquisition and related litigation expenses (income), net  
Operating income (loss) 2,474 10,074 11,291
Depreciation and amortization expenses 5,953 7,032 6,811
Mobility Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 54,169 104,665 97,180
Cost of revenues 37,728 53,263 47,995
Gross profit (loss) 16,441 51,402 49,185
Research and development, net 18,953 19,265 21,259
Selling and marketing 4,448 6,485 6,421
General and administrative 4,002 5,914 4,436
Merger, acquisition and related litigation expenses (income), net  
Operating income (loss) (10,962) 19,738 17,069
Depreciation and amortization expenses 4,259 3,871 6,128
Terrestrial Infrastructure Projects [Member]      
Segment Reporting Information [Line Items]      
Revenues 19,045 31,562 25,003
Cost of revenues 25,003 34,314 30,614
Gross profit (loss) (5,958) (2,752) (5,611)
Research and development, net
Selling and marketing 35 48 179
General and administrative 1,541 1,322 1,286
Merger, acquisition and related litigation expenses (income), net  
Operating income (loss) (7,534) (4,122) (7,076)
Depreciation and amortization expenses 79 75 $ 210
Unallocated [Member]      
Segment Reporting Information [Line Items]      
Revenues  
Cost of revenues  
Gross profit (loss)  
Research and development, net  
Selling and marketing  
General and administrative  
Merger, acquisition and related litigation expenses (income), net (53,633) 118  
Operating income (loss) 53,633 (118)  
Depreciation and amortization expenses