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PROVISION FOR INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
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) | 2018 |  | 2017 |  | 2016
U.S. operations | $ | (6,529 | ) |  | $ | (6,944 | ) |  | $ | (477 | )
Foreign operations | 66,293 |  |  | 67,243 |  |  | 50,429 |
Total pretax income | $ | 59,764 |  |  | $ | 60,299 |  |  | $ | 49,952 |
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) | 2018 |  | 2017 |  | 2016
Current provision (benefit): |  |  |  |  |
Federal | $ | (6,382 | ) |  | $ | 35,311 |  |  | $ | — |
State | 4 |  |  | 4 |  |  | — |
Foreign | 938 |  |  | 1,483 |  |  | 1,638 |
| (5,440 | ) |  | 36,798 |  |  | 1,638 |
Deferred provision (benefit): |  |  |  |  |
Federal | (4,593 | ) |  | (3,640 | ) |  | (175 | )
State | — |  |  | — |  |  | (27 | )
Foreign | (187 | ) |  | (468 | ) |  | (382 | )
| (4,780 | ) |  | (4,108 | ) |  | (584 | )
Total | $ | (10,220 | ) |  | $ | 32,690 |  |  | $ | 1,054 |
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,
| 2018 |  | 2017 |  | 2016
Provision (benefit) computed at Federal statutory rate | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Business tax credits | (9.1 | ) |  | (5.7 | ) |  | (6.0 | )
Stock-based compensation | (2.2 | ) |  | (5.0 | ) |  | 2.2 |
Foreign income taxed at different rate | (25.0 | ) |  | (37.3 | ) |  | (33.1 | )
GILTI inclusion | 10.6 |  |  | — |  |  | — |
U.S. Tax Act - transition tax | (16.2 | ) |  | 54.1 |  |  | — |
U.S. Tax Act - deferred tax asset and liability adjustment | — |  |  | 8.1 |  |  | — |
Valuation allowance | 2.8 |  |  | 2.2 |  |  | 1.8 |
Other | 1.0 |  |  | 2.8 |  |  | 2.2 |
Total | (17.1 | )% |  | 54.2 | % |  | 2.1 | %
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) | 2018 |  | 2017
Deferred tax assets: |  |  |
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 | )
| 8,143 |  |  | 4,286 |
Deferred tax liabilities: |  |  |
Depreciation | (1,423 | ) |  | (1,965 | )
Other | (30 | ) |  | (95 | )
| (1,453 | ) |  | (2,060 | )
Net deferred tax assets | $ | 6,690 |  |  | $ | 2,226 |
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, 2016 | $ | 13,560 |
Gross Increase for Tax Positions of Current Year | 1,856 |
Gross Decrease for Tax Positions of Prior Years | (23 | )
Unrecognized Tax Benefits Balance at December 31, 2016 | 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 |

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