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PROVISION FOR INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  |  | $ (189)
U.S. and foreign components of income before income taxes [Abstract] |  |  |  |
U.S. operations | $ (6,944) |  | $ (477) | (2,246)
Foreign operations | 67,243 |  | 50,429 | 41,577
INCOME BEFORE INCOME TAXES | 60,299 |  | 49,952 | 39,331
Current provision: |  |  |  |
Federal | 35,311 |  | 0 | 443
State | 4 |  | 0 | 83
Foreign | 1,483 |  | 1,638 | 5,407
Current provision | 36,798 |  | 1,638 | 5,933
Deferred provision (benefit): |  |  |  |
Federal | (3,640) |  | (175) | (1,791)
State | 0 |  | (27) | (57)
Foreign | (468) |  | (382) | (3,906)
Deferred provision (benefit) | (4,108) |  | (584) | (5,754)
Total | $ 32,690 |  | $ 1,054 | $ 179
Effective income tax rate reconciliation [Abstract] |  |  |  |
Provision computed at Federal statutory rate | 35.00% |  | 35.00% | 35.00%
Business tax credits | (5.70%) |  | (6.00%) | (6.80%)
Stock-based compensation | (5.00%) |  | 2.20% | 0.80%
Foreign income taxed at different rate | (37.30%) |  | (33.10%) | (33.20%)
IRS audit settlement | 54.10% |  | 0.00% | 0.00%
U.S. Tax Act - deferred tax asset and liability adjustment | 8.10% |  | 0.00% | 0.00%
Valuation allowance | 2.20% |  | 1.80% | 2.60%
Other | 2.80% |  | 2.20% | 2.10%
Total | 54.20% |  | 2.10% | 0.50%
Components of deferred income tax asset [Abstract] |  |  |  |
Other reserves and accruals | $ 979 |  | $ 1,267 |
Tax credit carry-forwards | 10,442 |  | 26,895 |
Stock compensation | 4,064 |  | 5,760 |
Capital losses | 163 |  | 10,585 |
Net operating loss | 7,059 |  | 2,671 |
Deferred Tax Assets, Other | 0 |  | 174 |
Valuation allowance | (18,421) |  | (27,489) |
Deferred tax assets, net of valuation allowance | 4,286 |  | 19,863 |
Depreciation | (1,965) |  | (2,322) |
Unremitted earnings | 0 |  | (7,019) |
Other | (95) |  | 0 |
Deferred tax liabilities | (2,060) |  | (9,341) |
Net deferred tax asset | 2,226 | [1] | 10,522 |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits [Roll Forward] |  |  |  |
Unrecognized Tax Benefits, Balance at beginning of period | 15,393 |  | 13,560 | $ 11,160
Gross Increase for Tax Positions of Current Year | 1,699 |  | 1,856 | 3,063
Gross Decrease for Tax Positions of Prior Years | (409) |  | (23) | (663)
Unrecognized Tax Benefits, Balance at end of period | 16,683 |  | 15,393 | 13,560
Unrecognized tax benefits [Abstract] |  |  |  |
Unrecognized Tax Benefits, Balance at end of period | 16,683 |  | 15,393 | $ 13,560
Income tax benefit that would be recorded if unrecognized tax benefits are recognized | 10,300 |  |  |
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 | $ 35,300 |  |  |
Future Effective Federal Income Tax Rate Percent | 21.00% |  |  |
Provisional Net Adjustment of Deferred Tax Assets and Liabilities Related to Tax Cuts and Jobs Act | $ 4,900 |  |  |
Current Federal Tax Expense Related to Impact of Tax Cuts and Jobs Act | 37,500 |  |  |
State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | 46,600 |  |  |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] | California Taxing Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward, amount | 21,500 |  |  |
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 | 800 |  |  |
Research Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward, amount | $ 2,400 |  |  |
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 Carryforwards, 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 Carryforwards, Expiration Date | Jan. 01, 2030 |  |  |
[1] | The reduction of deferred tax assets is primarily due to the utilization of tax attributes for transition tax related to the Tax Act as well as the reduction of the U.S. federal corporate tax rate from 35% to 21% beginning in 2018.

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