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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation Expense [Abstract] |  |  |
Compensation expense | $ 52,255 | $ 42,718 | $ 39,030
Expense related to stock options settled |  | 1,500 |
Cost of revenues |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Compensation expense | 9,273 | 7,688 | 4,971
Selling and marketing (excluding customer base amortization) |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Compensation expense | 6,809 | 6,881 | 7,086
Software development |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Compensation expense | 8,985 | 7,454 | 7,071
General and administrative |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Compensation expense | $ 27,188 | $ 20,695 | $ 19,902

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