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Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | $ 149,077 | $ 147,221
Accumulated amortization: | 107,598 | 96,210
Intangible assets, net | 41,479 | 51,011
Capitalized software costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 78,793 | 75,126
Accumulated amortization: | 66,123 | 61,834
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 54,850 | 56,296
Accumulated amortization: | 33,578 | 27,967
Backlog and non-compete agreement [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 2,712 | 2,712
Accumulated amortization: | 2,674 | 2,486
Acquired technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amounts: | 12,722 | 13,087
Accumulated amortization: | $ 5,223 | $ 3,923

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