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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets |
|  | December 31, |
|  | 2017 |  |  | 2018 |
Original amounts: |  |  |  |  |  |
Capitalized software costs |  | $ | 75,126 |  |  | $ | 78,793 |
Customer relationships |  |  | 56,296 |  |  |  | 54,850 |
Backlog and non-compete agreement |  |  | 2,712 |  |  |  | 2,712 |
Acquired technology |  |  | 13,087 |  |  |  | 12,722 |
|  |  | 147,221 |  |  |  | 149,077 |
Accumulated amortization: |  |  |  |  |  |  |  |
Capitalized software costs |  |  | 61,834 |  |  |  | 66,123 |
Customer relationships |  |  | 27,967 |  |  |  | 33,578 |
Backlog and non-compete agreement |  |  | 2,486 |  |  |  | 2,674 |
Acquired technology |  |  | 3,923 |  |  |  | 5,223 |
|  |  | 96,210 |  |  |  | 107,598 |
Intangible assets, net |  | $ | 51,011 |  |  | $ | 41,479 |
Schedule of estimated future amortization expense of intangible assets |
2019 |  | $ | 10,323 |
2020 |  |  | 8,572 |
2021 |  |  | 7,057 |
2022 |  |  | 4,749 |
2023 |  |  | 3,546 |
2024 and thereafter |  |  | 7,232 |
|  | $ | 41,479 |

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