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Segment Geographical Information and Major Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Total revenues $ 325,630 $ 284,375 $ 258,140
Expenses 291,978 252,677 232,184
Segment operating income (loss) 33,652 31,698 25,956
Depreciation and amortization 14,025 12,564 13,611
Software Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 86,140 81,332 77,100
Expenses 71,825 63,902 63,649
Segment operating income (loss) 14,315 17,430 13,451
Depreciation and amortization 8,799 8,727 9,242
It Professional Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 239,490 203,043 181,040
Expenses 216,842 183,985 164,558
Segment operating income (loss) 22,648 19,058 16,482
Depreciation and amortization 5,059 3,611 4,100
Unallocated Expenses [Member]      
Segment Reporting Information [Line Items]      
Total revenues
Expenses 3,311 4,790 3,977
Segment operating income (loss) (3,311) (4,790) (3,977)
Depreciation and amortization $ 167 $ 226 $ 269