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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Intangible Assets/Goodwill [Abstract] |
INTANGIBLE ASSETS |
| NOTE 8:- | INTANGIBLE ASSETS
| a. | Intangible assets:
|  |  | December 31, |
|  |  | 2016 |  |  | 2017 |
| Original amounts: |  |  |  |  |  |  |  |
| Capitalized software costs |  | $ | 71,349 |  |  | $ | 75,126 |
| Customer relationships |  |  | 53,370 |  |  |  | 56,296 |
| Backlog and non-compete agreement |  |  | 2,712 |  |  |  | 2,712 |
| Acquired technology |  |  | 12,375 |  |  |  | 13,087 |
|  |  |  | 139,806 |  |  |  | 147,221 |
| Accumulated amortization: |  |  |  |  |  |  |  |
| Capitalized software costs |  |  | 57,286 |  |  |  | 61,834 |
| Customer relationships |  |  | 21,684 |  |  |  | 27,967 |
| Backlog and non-compete agreement |  |  | 2,260 |  |  |  | 2,486 |
| Acquired technology |  |  | 2,396 |  |  |  | 3,923 |
|  |  |  | 83,626 |  |  |  | 96,210 |
| Intangible assets, net |  | $ | 56,180 |  |  | $ | 51,011 |
| b. | Amortization expenses amounted to $ 9,093, $ 10,715 and $ 12,565 for the years ended December 31, 2015, 2016 and 2017, respectively.
| c. | The estimated future amortization expense of intangible assets as of December 31, 2017 is as follows:
| 2018 |  | $ | 11,439 |
| 2019 |  |  | 9,698 |
| 2020 |  |  | 8,203 |
| 2021 |  |  | 6,585 |
| 2022 |  |  | 4,333 |
| 2023 and thereafter |  |  | 10,753 |
|  |  | $ | 51,011 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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