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STOCK-BASED COMPENSATION - Expense Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation before tax | $ 80,909 | $ 63,862 | $ 53,313
Income tax benefit | (16,392) | (13,383) | (12,113)
Cost of revenues |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation before tax | 18,822 | 16,862 | 14,573
Selling and marketing |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation before tax | 32,665 | 23,237 | 15,720
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation before tax | 18,938 | 15,274 | 13,618
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation before tax | $ 10,484 | $ 8,489 | $ 9,402

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