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Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | $ 147,221 | $ 139,806
Accumulated amortization: | 96,210 | 83,626
Intangible assets, net | 51,011 | 56,180
Capitalized software costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 75,126 | 71,349
Accumulated amortization: | 61,834 | 57,286
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 56,296 | 53,370
Accumulated amortization: | 27,967 | 21,684
Backlog and non-compete agreement [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 2,712 | 2,712
Accumulated amortization: | 2,486 | 2,260
Acquired technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 13,087 | 12,375
Accumulated amortization: | $ 3,923 | $ 2,396

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