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Income Taxes (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Examination [Line Items] |  |  |  |  |
Tax credit carryforwards, research | $ 8,300 | $ 8,300 |  |  |
Deferred tax asset valuation allowance | 16,889 | 16,889 | $ 8,754 | $ 6,388 | $ 6,202
Current foreign tax expense (benefit) |  | 26,604 | $ 27,418 | 24,537 |
Tax credit carryforwards, AMT | 500 | $ 500 |  |  |
Effective income tax rate |  | 20.70% | 39.50% |  |
Deferred tax liabilities, undistributed foreign earnings | 1,800 | $ 1,800 | $ 3,100 |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) | 200 | 200 |  |  |
Provisional income tax benefit |  | 7,500 |  |  |
Change in tax rate, deferred tax asset, provisional income tax expense |  | 7,700 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 9,600 | 9,600 |  |  |
Unrecognized tax benefits that would result in adjustments to other tax accounts | 200 | 200 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 500 | 500 | 600 |  |
Unrecognized tax benefits, income tax penalties and interest expense (benefit) |  | (100) | 200 | $ (900) |
Minimum amount of unrecognized tax benefits that could be recognized over next 12 months | 1,800 | 1,800 |  |  |
Arizona |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
State operating loss carryforwards | 8,400 | 8,400 |  |  |
State and Local Jurisdiction |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Deferred tax asset valuation allowance | 16,900 | 16,900 | 8,800 |  |
Minimum |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
State operating loss carryforwards | 3,700 | 3,700 |  |  |
Maximum |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
State operating loss carryforwards | 6,100 | 6,100 |  |  |
China |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Current foreign tax expense (benefit) |  | 3,700 |  |  |
Deferred tax liabilities, undistributed foreign earnings | $ 1,800 | $ 1,800 | $ 3,100 |  |

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