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PROVISION FOR INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
U.S. and foreign components of income before income taxes [Abstract] |  |  |
U.S. operations | $ (6,529) | $ (6,944) | $ (477)
Foreign operations | 66,293 | 67,243 | 50,429
INCOME BEFORE INCOME TAXES | 59,764 | 60,299 | 49,952
Current provision: |  |  |
Federal | (6,382) | 35,311 | 0
State | 4 | 4 | 0
Foreign | 938 | 1,483 | 1,638
Current provision | (5,440) | 36,798 | 1,638
Deferred provision (benefit): |  |  |
Federal | (4,593) | (3,640) | (175)
State | 0 | 0 | (27)
Foreign | (187) | (468) | (382)
Deferred provision (benefit) | $ (4,780) | $ (4,108) | $ (584)
Effective income tax rate reconciliation [Abstract] |  |  |
Provision (benefit) computed at Federal statutory rate | 21.00% | 35.00% | 35.00%
Business tax credits | (9.10%) | (5.70%) | (6.00%)
Stock-based compensation | (2.20%) | (5.00%) | 2.20%
Foreign income taxed at different rate | (25.00%) | (37.30%) | (33.10%)
GILTI inclusion | 10.60% | 0.00% | 0.00%
U.S. Tax Act - transition tax | (16.20%) | 54.10% | 0.00%
U.S. Tax Act - deferred tax asset and liability adjustment | 0.00% | 8.10% | 0.00%
Valuation allowance | 2.80% | 2.20% | 1.80%
Other | 1.00% | 2.80% | 2.20%
Total | (17.10%) | 54.20% | 2.10%
Components of deferred income tax asset [Abstract] |  |  |
Other reserves and accruals | $ 3,695 | $ 979 |
Tax credit carry-forwards | 18,052 | 10,442 |
Stock compensation | 3,050 | 4,064 |
Capital losses | 157 | 163 |
Net operating loss | 3,144 | 7,059 |
Valuation allowance | (19,955) | (18,421) |
Deferred tax assets, net of valuation allowance | 8,143 | 4,286 |
Depreciation | (1,423) | (1,965) |
Other | (30) | (95) |
Deferred tax liabilities | (1,453) | (2,060) |
Net deferred tax asset | 6,690 | 2,226 |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized Tax Benefits, Balance at beginning of period | 16,683 | 15,393 | $ 13,560
Gross Increase for Tax Positions of Current Year | 1,994 | 1,699 | 1,856
Gross Decrease for Tax Positions of Prior Years | (70) | (409) | (23)
Unrecognized Tax Benefits, Balance at end of period | 18,607 | 16,683 | 15,393
Unrecognized tax benefits [Abstract] |  |  |
Unrecognized Tax Benefits, Balance at end of period | 18,607 | 16,683 | $ 15,393
Income tax benefit that would be recorded if unrecognized tax benefits are recognized | 9,400 |  |
Income tax interest and penalties accrued | 100 | 100 |
U.S. Tax Cuts and Jobs Act [Abstract] |  |  |
Provisional One Time Transition Tax Related to Tax Cuts and Jobs Act | 34,100 |  |
Current Federal Tax Expense Related to Impact of Tax Cuts and Jobs Act | (9,700) | $ 37,500 |
Provisional One Time Transition Tax Related to Tax Cuts and Jobs Act, After Utilization | 6,700 |  |
Income Tax, Global Intangible Low Tax Income, Before Credits | 6,300 |  |
Tax Benefit, Initial Recognition of Global Intangible Low-Taxed Income Deferred Tax Asset | 2,300 |  |
State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 54,700 |  |
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 7,200 |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 24,300 |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 900 |  |
Research Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | $ 2,600 |  |
Earliest Tax Year [Member] | Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Credit Carryforward, Expiration Date | Jan. 01, 2033 |  |
Earliest Tax Year [Member] | State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2032 |  |
Earliest Tax Year [Member] | Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Credit Carryforward, Expiration Date | Jan. 01, 2026 |  |
Earliest Tax Year [Member] | Research Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Credit Carryforward, Expiration Date | Jan. 01, 2030 |  |

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