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PROVISION FOR INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Current Federal Tax Expense (Benefit) Related to Impact of Tax Cuts and Jobs Act |  | $ (9,700) | $ 37,500
U.S. and foreign components of income before income taxes [Abstract] |  |  |
U.S. operations | $ 82,692 | (6,529) | (6,944)
Foreign operations | 139,722 | 66,293 | 67,243
INCOME BEFORE INCOME TAXES | 222,414 | 59,764 | 60,299
Current provision: |  |  |
Federal | 18,293 | (6,382) | 35,311
State | 184 | 4 | 4
Foreign | 1,293 | 938 | 1,483
Current provision | 19,770 | (5,440) | 36,798
Deferred provision (benefit): |  |  |
Federal | 9,683 | (4,593) | (3,640)
State | 0 | 0 | 0
Foreign | (507) | (187) | (468)
Deferred provision (benefit) | $ 9,176 | $ (4,780) | $ (4,108)
Effective income tax rate reconciliation [Abstract] |  |  |
Provision (benefit) computed at Federal statutory rate | 21.00% | 21.00% | 35.00%
Business tax credits | (2.40%) | (9.10%) | (5.70%)
Stock-based compensation | (0.20%) | (2.20%) | (5.00%)
Foreign income taxed at different rate | (12.70%) | (25.00%) | (37.30%)
GILTI inclusion | 6.20% | 10.60% | 0.00%
U.S. Tax Act - transition tax | 0.10% | (16.20%) | 54.10%
U.S. Tax Act - deferred tax asset and liability adjustment | 0.00% | 0.00% | 8.10%
Valuation allowance | 0.80% | 2.80% | 2.20%
Other | 0.20% | 1.00% | 2.80%
Total | 13.00% | (17.10%) | 54.20%
Components of deferred income tax asset [Abstract] |  |  |
Other reserves and accruals | $ 3,099 | $ 3,695 |
Tax credit carry-forwards | 18,968 | 18,052 |
Stock compensation | 1,644 | 3,050 |
Capital losses | 157 | 157 |
Net operating loss | 899 | 3,144 |
Other | 1,000 | 0 |
Valuation allowance | (20,822) | (19,955) |
Deferred tax assets, net of valuation allowance | 4,945 | 8,143 |
Depreciation | (2,273) | (1,423) |
Other | 0 | (30) |
Deferred tax liabilities | (2,273) | (1,453) |
Net deferred tax asset | 2,672 | 6,690 |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized Tax Benefits, Balance at beginning of period | 18,607 | 16,683 | $ 15,393
Gross Increase for Tax Positions of Current Year | 1,379 | 1,994 | 1,699
Gross Decrease for Tax Positions of Prior Years | (937) | (70) | (409)
Unrecognized Tax Benefits, Balance at end of period | 19,049 | 18,607 | 16,683
Unrecognized tax benefits [Abstract] |  |  |
Unrecognized Tax Benefits, Balance at end of period | 19,049 | 18,607 | $ 16,683
Income tax benefit that would be recorded if unrecognized tax benefits are recognized | 10,600 |  |
Income tax interest and penalties accrued |  | $ 100 |
State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 24,600 |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 27,500 |  |
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 | 700 |  |
Research Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | $ 3,100 |  |
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, 2031 |  |
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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