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STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation before tax | $ 25,655 | $ 20,047 | $ 48,831 | $ 38,397
Income tax benefit | (5,107) | (4,056) | (9,689) | (7,796)
Cost of revenues |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation before tax | 5,384 | 4,911 | 10,536 | 9,430
Selling and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation before tax | 11,592 | 8,364 | 21,310 | 15,738
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation before tax | 5,805 | 4,572 | 11,302 | 9,132
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation before tax | $ 2,874 | $ 2,200 | $ 5,683 | $ 4,097

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