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Segment Geographical Information and Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 258,140 | $ 201,646 | $ 176,030
Expenses | 232,184 | 180,559 | 154,596
Segment operating income (loss) | 25,956 | 21,087 | 21,434
Depreciation and amortization | 13,611 | 11,608 | 9,885
Software services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 77,100 | 70,834 | 67,271
Expenses | 63,649 | 58,847 | 52,963
Segment operating income (loss) | 13,451 | 11,987 | 14,308
Depreciation and amortization | 9,242 | 7,531 | 6,562
IT professional services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 181,040 | 130,812 | 108,759
Expenses | 164,558 | 118,414 | 98,384
Segment operating income (loss) | 16,482 | 12,398 | 10,375
Depreciation and amortization | 4,100 | 3,769 | 3,042
Unallocated expense [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues |  |  |
Expenses | 3,977 | 3,298 | 3,249
Segment operating income (loss) | (3,977) | (3,298) | (3,249)
Depreciation and amortization | $ 269 | $ 308 | $ 281

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