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PROVISION (BENEFIT) FOR INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Current Federal Tax Benefit Related To Impact of Tax Cuts And Jobs Act |  |  | $ 9,700
U.S. and foreign components of income before income taxes [Abstract] |  |  |
U.S. operations | $ (6,252) | $ 82,692 | (6,529)
Foreign operations | 81,503 | 139,722 | 66,293
INCOME BEFORE INCOME TAXES | 75,251 | 222,414 | 59,764
Current provision (benefit): |  |  |
Federal | 2,788 | 18,293 | (6,382)
State | (181) | 184 | 4
Foreign | 1,677 | 1,293 | 938
Current provision (benefit) | 4,284 | 19,770 | (5,440)
Deferred provision (benefit): |  |  |
Federal | 348 | 9,683 | (4,593)
State | 0 | 0 | 0
Foreign | (557) | (507) | (187)
Deferred provision (benefit) | (209) | 9,176 | (4,780)
Income tax provision (benefit), Total | $ 4,075 | $ 28,946 | $ (10,220)
Effective income tax rate reconciliation [Abstract] |  |  |
Provision (benefit) computed at Federal statutory rate | 21.00% | 21.00% | 21.00%
Business tax credits | (7.40%) | (2.40%) | (9.10%)
Stock-based compensation | (0.10%) | (0.20%) | (2.20%)
Foreign income taxed at different rate | (22.00%) | (12.70%) | (25.00%)
GILTI inclusion | 10.70% | 6.20% | 10.60%
U.S. Tax Act - transition tax | 0.00% | 0.10% | (16.20%)
Deferred tax asset and liability adjustment | 0.30% | 0.00% | 0.00%
Valuation allowance | 2.60% | 0.80% | 2.80%
Other | 0.30% | 0.20% | 1.00%
Total | 5.40% | 13.00% | (17.10%)
Components of deferred income tax asset [Abstract] |  |  |
Other reserves and accruals | $ 3,707 | $ 3,099 |
Tax credit carry-forwards | 20,713 | 18,968 |
Stock compensation | 1,494 | 1,644 |
Capital losses | 158 | 157 |
Net operating loss | 2,303 | 899 |
Other | 1,023 | 1,000 |
Valuation allowance | (24,160) | (20,822) |
Deferred tax assets, net of valuation allowance | 5,238 | 4,945 |
Depreciation | (1,974) | (2,273) |
Deferred tax liabilities | (1,974) | (2,273) |
Net deferred tax assets | 3,264 | 2,672 |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized Tax Benefits, Balance at beginning of period | 19,049 | 18,607 | $ 16,683
Gross Increase for Tax Positions of Current Year | 2,002 | 1,379 | 1,994
Gross Decrease for Tax Positions of Prior Years | 0 | (937) | (70)
Unrecognized Tax Benefits, Balance at end of period | 21,051 | 19,049 | 18,607
Unrecognized tax benefits [Abstract] |  |  |
Unrecognized Tax Benefits, Balance at end of period | 21,051 | 19,049 | $ 18,607
Income tax benefit that would be recorded if unrecognized tax benefits are recognized | 11,100 |  |
Income tax interest and penalties accrued | 100 | $ 100 |
State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 44,700 |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 30,200 |  |
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 | $ 3,400 |  |
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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