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PROVISION FOR INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
U.S. and foreign components of income before income taxes [Table Text Block] | U.S. and foreign components of income before income taxes were:
| Year Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
U.S. operations | $ | 82,692 |  |  | $ | (6,529 | ) |  | $ | (6,944 | )
Foreign operations | 139,722 |  |  | 66,293 |  |  | 67,243 |
Total income before income taxes | $ | 222,414 |  |  | $ | 59,764 |  |  | $ | 60,299 |
Components of provision for income taxes [Table Text Block] | The components of the provision (benefit) for income taxes are as follows:
| Year Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017
Current provision (benefit): |  |  |  |  |
Federal | $ | 18,293 |  |  | $ | (6,382 | ) |  | $ | 35,311 |
State | 184 |  |  | 4 |  |  | 4 |
Foreign | 1,293 |  |  | 938 |  |  | 1,483 |
| 19,770 |  |  | (5,440 | ) |  | 36,798 |
Deferred provision (benefit): |  |  |  |  |
Federal | 9,683 |  |  | (4,593 | ) |  | (3,640 | )
State | — |  |  | — |  |  | — |
Foreign | (507 | ) |  | (187 | ) |  | (468 | )
| 9,176 |  |  | (4,780 | ) |  | (4,108 | )
Total | $ | 28,946 |  |  | $ | (10,220 | ) |  | $ | 32,690 |
Effective income tax rate reconciliation [Table Text Block] | The provision (benefit) for income taxes differs from the amount that would result by applying the applicable federal income tax rate to income before income taxes, as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Provision (benefit) computed at Federal statutory rate | 21.0 | % |  | 21.0 | % |  | 35.0 | %
Business tax credits | (2.4 | ) |  | (9.1 | ) |  | (5.7 | )
Stock-based compensation | (0.2 | ) |  | (2.2 | ) |  | (5.0 | )
Foreign income taxed at different rate | (12.7 | ) |  | (25.0 | ) |  | (37.3 | )
GILTI inclusion | 6.2 |  |  | 10.6 |  |  | — |
U.S. Tax Act - transition tax | 0.1 |  |  | (16.2 | ) |  | 54.1 |
U.S. Tax Act - deferred tax asset and liability adjustment | — |  |  | — |  |  | 8.1 |
Valuation allowance | 0.8 |  |  | 2.8 |  |  | 2.2 |
Other | 0.2 |  |  | 1.0 |  |  | 2.8 |
Total | 13.0 | % |  | (17.1 | )% |  | 54.2 | %
Components of net deferred income tax asset [Table Text Block] | The components of the net deferred income tax assets (liabilities) were as follows:
| December 31,
(in thousands) | 2019 |  | 2018
Deferred tax assets: |  |  |
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 |  |  | — |
Valuation allowance | (20,822 | ) |  | (19,955 | )
| 4,945 |  |  | 8,143 |
Deferred tax liabilities: |  |  |
Depreciation | (2,273 | ) |  | (1,423 | )
Other | — |  |  | (30 | )
| (2,273 | ) |  | (1,453 | )
Net deferred tax assets | $ | 2,672 |  |  | $ | 6,690 |
Unrecognized tax benefits rollforward [Table Text Block] | Reconciliation of the beginning and ending amount of unrecognized tax benefits:
(in thousands) | Unrecognized Tax Benefits
Unrecognized Tax Benefits Balance at January 1, 2017 | $ | 15,393 |
Gross Increase for Tax Positions of Current Year | 1,699 |
Gross Decrease for Tax Positions of Prior Years | (409 | )
Unrecognized Tax Benefits Balance at December 31, 2017 | 16,683 |
Gross Increase for Tax Positions of Current Year | 1,994 |
Gross Decrease for Tax Positions of Prior Years | (70 | )
Unrecognized Tax Benefits Balance at December 31, 2018 | 18,607 |
Gross Increase for Tax Positions of Current Year | 1,379 |
Gross Decrease for Tax Positions of Prior Years | (937 | )
Unrecognized Tax Benefits Balance at December 31, 2019 | $ | 19,049 |

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