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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 |  |  |

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