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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Deferred Tax Assets and Deferred Tax Liabilities | The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating losses |  |  | 12,731 |  |  |  | 13,643 |
Research and development credits |  |  | 27,257 |  |  |  | 23,012 |
Depreciation |  |  | 5,571 |  |  |  | 5,457 |
Valuation reserves and accrued liabilities |  |  | 6,020 |  |  |  | 9,667 |
Foreign tax credit |  |  | — |  |  |  | 6,926 |
Stock compensation |  |  | 3,955 |  |  |  | 4,508 |
Inventory |  |  | 2,062 |  |  |  | 1,571 |
Patents |  |  | 163 |  |  |  | 218 |
Defined benefit obligation |  |  | 1,977 |  |  |  | 2,306 |
Other credits |  |  | 589 |  |  |  | 639 |
Unrealized foreign currency exchange loss |  |  | 2,556 |  |  |  | — |
Other |  |  | 36 |  |  |  | 116 |
|  |  | 62,917 |  |  |  | 68,063 |
Valuation allowance |  |  | (27,578 | ) |  |  | (19,304 | )
Deferred tax liabilities: |  |  |  |  |  |  |  |
Intangible assets |  |  | (2,925 | ) |  |  | (8,442 | )
Unrealized foreign currency exchange gains |  |  | — |  |  |  | (285 | )
Undistributed profits of subsidiary |  |  | (6,450 | ) |  |  | (12,002 | )
Property and equipment |  |  | (1,611 | ) |  |  | (470 | )
Other |  |  | (548 | ) |  |  | (319 | )
|  |  | (11,534 | ) |  |  | (21,518 | )
Net deferred tax asset |  | $ | 23,805 |  |  | $ | 27,241 |
Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate | Reconciliations between the statutory Federal income tax rate of 34% and the effective rate of income tax expense for each of the three years in the period ended December 31, 2017 are as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Statutory Federal income tax rate |  |  | 34.0 | % |  |  | 34.0 | % |  |  | 34.0 | %
Increase (Decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Taxes on foreign income, net of taxes paid credit |  |  | — |  |  |  | 1.3 | % |  |  | 1.0 | %
Change in valuation allowance |  |  | 10.6 | % |  |  | 5.3 | % |  |  | (1.9 | %)
Foreign, state and local tax, net of Federal benefit |  |  | 0.8 | % |  |  | 1.1 | % |  |  | 1.6 | %
Nondeductible expenses |  |  | 2.4 | % |  |  | 2.4 | % |  |  | 1.8 | %
Stock option compensation |  |  | (2.2 | %) |  |  | — |  |  |  | (0.1 | %)
Research and development credits |  |  | (4.6 | %) |  |  | (0.7 | %) |  |  | (0.9 | %)
Effect of different tax rates of foreign jurisdictions |  |  | (20.8 | %) |  |  | (15.0 | %) |  |  | (12.1 | %)
Undistributed profits of subsidiaries |  |  | 5.8 | % |  |  | 7.9 | % |  |  | 2.4 | %
Tax reform items |  |  | 29.1 | % |  |  | — |  |  |  | — |
Other tax exempt income |  |  | — |  |  |  | — |  |  |  | (0.1 | %)
Tax effects of intercompany transfers |  |  | (5.0 | %) |  |  | (5.3 | %) |  |  | — |
Other |  |  | (1.0 | %) |  |  | (0.3 | %) |  |  | 0.3 | %
Effective rate |  |  | 49.1 | % |  |  | 30.7 | % |  |  | 26.0 | %
Net Operating Loss Carryforwards | The Company has Net Operating Loss (“NOL”) carryforwards as follows:
Jurisdiction |  | Amount as of December 31, 2017 |  |  | Years of Expiration |
U.S. Federal and state income tax |  | $ | 61,302 |  |  |  | 2018- 2036 |
Foreign |  | $ | 12,499 |  |  |  | 2018-2037 |
Foreign |  | $ | 24,911 |  |  |  | Indefinite |
Earnings Before Income Taxes | The earnings before income taxes and our tax provision are comprised of the following:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 1,258 |  |  | $ | 12,981 |  |  | $ | 25,508 |
Foreign |  |  | 67,997 |  |  |  | 97,582 |  |  |  | 103,430 |
Total income before income taxes |  | $ | 69,255 |  |  | $ | 110,563 |  |  | $ | 128,938 |
Provision for Income Taxes |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current income tax expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 4,140 |  |  | $ | 9,215 |  |  | $ | 8,428 |
State and local |  |  | 150 |  |  |  | 749 |  |  |  | 606 |
Foreign |  |  | 24,672 |  |  |  | 32,844 |  |  |  | 24,622 |
Total current income tax expense |  | $ | 28,962 |  |  | $ | 42,808 |  |  | $ | 33,656 |
Deferred income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 15,207 |  |  | $ | (10,597 | ) |  | $ | (3,051 | )
State and local |  |  | 2,308 |  |  |  | (742 | ) |  |  | (183 | )
Foreign |  |  | (12,449 | ) |  |  | 2,496 |  |  |  | 3,123 |
Total deferred income tax expense |  | $ | 5,066 |  |  | $ | (8,843 | ) |  | $ | (111 | )
Total tax expense |  | $ | 34,028 |  |  | $ | 33,965 |  |  | $ | 33,545 |
Reconciliation of Unrecognized Tax Benefits | The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  | 2015 |
Balance at beginning of year |  | $ | 4,486 |  |  | $ | 4,443 |  | $ | 4,651 |
Additions based on tax position related to current year |  |  | 1,758 |  |  |  | 80 |  |  | — |
Additions based on tax positions related to prior year |  |  | (4 | ) |  |  | 366 |  |  | 262 |
Reductions from settlements and statute of limitation expiration |  |  | (2,247 | ) |  |  | (299 | ) |  | (19 | )
Effect of foreign currency translation |  |  | 529 |  |  |  | (104 | ) |  | (451 | )
Balance at end of year |  | $ | 4,522 |  |  | $ | 4,486 |  | $ | 4,443 |

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