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STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | $ 23,175 | $ 18,350
Income tax benefit | (4,582) | (3,740)
Cost of revenues |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 5,152 | 4,519
Selling and marketing |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 9,718 | 7,374
Research and development |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 5,496 | 4,560
General and administrative |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | $ 2,809 | $ 1,897

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