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INCOME TAXES - Reconciliation of the Statutory U.S. Federal Tax Rate to the Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |
Statutory U.S. federal income tax rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal benefit | (0.20%) | 0.00% | 0.50%
Effect of foreign operations | (4.70%) | (7.10%) | 0.90%
Accruals and reserves | 0.00% | 0.10% | 3.20%
Nondeductible employee compensation | 1.70% | 1.50% | 1.50%
Research tax credits | (2.70%) | (0.70%) | (1.30%)
Change in valuation allowance | 0.00% | (4.10%) | (9.70%)
Stock based compensation | (2.70%) | (1.90%) | 0.00%
U.S. Tax Cuts and Jobs Act | (3.50%) | 7.70% | 0.00%
U.S. International Tax (Sub F, GILTI, FDII) | (1.20%) | 0.00% | 0.00%
Other | 0.80% | 0.00% | (0.20%)
Effective tax rate | 8.50% | 30.50% | 29.90%

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