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Segment Geographical Information and Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 284,375 | $ 258,140 | $ 201,646
Expenses | 252,677 | 232,184 | 180,559
Segment operating income (loss) | 31,698 | 25,956 | 21,087
Depreciation and amortization | 12,564 | 13,611 | 11,608
Software Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 81,332 | 77,100 | 70,834
Expenses | 63,902 | 63,649 | 58,847
Segment operating income (loss) | 17,430 | 13,451 | 11,987
Depreciation and amortization | 8,727 | 9,242 | 7,531
It Professional Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 203,043 | 181,040 | 130,812
Expenses | 183,985 | 164,558 | 118,414
Segment operating income (loss) | 19,058 | 16,482 | 12,398
Depreciation and amortization | 3,611 | 4,100 | 3,769
Unallocated Expenses [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues |  |  |
Expenses | 4,790 | 3,977 | 3,298
Segment operating income (loss) | (4,790) | (3,977) | (3,298)
Depreciation and amortization | $ 226 | $ 269 | $ 308

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