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PROVISION FOR INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
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) | 2017 |  | 2016 |  | 2015
U.S. operations | $ | (6,944 | ) |  | $ | (477 | ) |  | $ | (2,246 | )
Foreign operations | 67,243 |  |  | 50,429 |  |  | 41,577 |
Total pretax income | $ | 60,299 |  |  | $ | 49,952 |  |  | $ | 39,331 |
Components of provision for income taxes [Table Text Block] | The components of the provision for income taxes are as follows:
| Year Ended December 31,
(in thousands) | 2017 |  | 2016 |  | 2015
Current provision: |  |  |  |  |
Federal | $ | 35,311 |  |  | $ | — |  |  | $ | 443 |
State | 4 |  |  | — |  |  | 83 |
Foreign | 1,483 |  |  | 1,638 |  |  | 5,407 |
| 36,798 |  |  | 1,638 |  |  | 5,933 |
Deferred provision (benefit): |  |  |  |  |
Federal | (3,640 | ) |  | (175 | ) |  | (1,791 | )
State | — |  |  | (27 | ) |  | (57 | )
Foreign | (468 | ) |  | (382 | ) |  | (3,906 | )
| (4,108 | ) |  | (584 | ) |  | (5,754 | )
Total | $ | 32,690 |  |  | $ | 1,054 |  |  | $ | 179 |
Effective income tax rate reconciliation [Table Text Block] | The provision for income taxes differs from the amount that would result by applying the applicable federal income tax rate to income before provision for income taxes, as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Provision computed at Federal statutory rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Business tax credits | (5.7 | ) |  | (6.0 | ) |  | (6.8 | )
Stock-based compensation | (5.0 | ) |  | 2.2 |  |  | 0.8 |
Foreign income taxed at different rate | (37.3 | ) |  | (33.1 | ) |  | (33.2 | )
U.S. Tax Act - transition tax | 54.1 |  |  | — |  |  | — |
U.S. Tax Act - deferred tax asset and liability adjustment | 8.1 |  |  | — |  |  | — |
Valuation allowance | 2.2 |  |  | 1.8 |  |  | 2.6 |
Other | 2.8 |  |  | 2.2 |  |  | 2.1 |
Total | 54.2 | % |  | 2.1 | % |  | 0.5 | %
Components of net deferred income tax asset [Table Text Block] | The components of the net deferred income tax asset (liabilities) were as follows:
| December 31,
(in thousands) | 2017(1) |  | 2016
Deferred tax assets: |  |  |
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 |
Other | — |  |  | 174 |
Valuation allowance | (18,421 | ) |  | (27,489 | )
| 4,286 |  |  | 19,863 |
Deferred tax liabilities: |  |  |
Depreciation | (1,965 | ) |  | (2,322 | )
Unremitted earnings | — |  |  | (7,019 | )
Other | (95 | ) |  | — |
| (2,060 | ) |  | (9,341 | )
Net deferred tax asset | $ | 2,226 |  |  | $ | 10,522 |
Unrecognized tax benefits rollforward [Table Text Block] | The Company applies the provisions of ASC 740-10, relating to accounting for uncertain income taxes. Reconciliation of the beginning and ending amount of unrecognized tax benefits:
(in thousands) | Unrecognized Tax Benefits
Unrecognized Tax Benefits Balance at January 1, 2015 | $ | 11,160 |
Gross Increase for Tax Positions of Current Year | 3,063 |
Gross Decrease for Tax Positions of Prior Years | (663 | )
Unrecognized Tax Benefits Balance at December 31, 2015 | 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 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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