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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Deferred | $ (2,366,000) | $ 7,628,000 | $ 7,422,000
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings Liability | 57,500,000 |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings Liability NonCurrent | 51,000,000.0 |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  | 6,400,000 | 101,600,000
Revaluation of deferred tax assets and liabilities |  | 2,000,000.0 | (3,900,000)
Provisional impact of U.S. Tax Reform | $ 0 | 4,353,000 | (97,707,000)
Tax Cuts and Jobs Act, Accounting Complete [true false] | true |  |
Tax Cuts and Jobs Act, Accounting Complete, Date | Dec. 31, 2018 |  |
Global Intangible Low-Taxed Income | $ 955,000 | 3,206,000 | 0
Foreign earnings repatriated | 52,100,000 | 560,600,000 |
Income tax expense on foreign earnings expected to be repatriated | 0 | 21,612,000 | 0
Net change in total deferred tax asset valuation allowance | 2,300,000 | 2,100,000 | 200,000
Cumulative undistributed earnings of foreign subsidiaries | 313,900,000 |  |
Income tax incentives | $ 5,035,000 | $ 7,886,000 | $ 7,238,000
Net impact of tax incentives, per diluted share | $ 0.13 | $ 0.17 | $ 0.15
Interest on unrecognized tax | $ 100,000 |  |
Penalty on unrecognized tax | 17,000.0 |  |
Accrued income tax penalties and interest on unrecognized tax benefits | 600,000 |  |
Interest and penalties included in income tax expense | 0 | $ 100,000 | $ 0
Additional reserve for uncertain tax benefits | 200,000 | 0 | 894,000
Decreases related to prior year tax positions | 0 | 532,000 | 8,197,000
Unrecognized deferred tax liability | 1,700,000 |  |
U.S. Federal [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  | 3,200,000 |
Revaluation of deferred tax assets and liabilities |  | 9,200,000 |
Provisional impact of U.S. Tax Reform |  | (4,400,000) |
Operating loss carryforwards | $ 16,500,000 |  |
U.S. Federal [Member] | Earliest Tax Year [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Tax credit carryforward expiration year | 2027 |  |
U.S. Federal [Member] | Latest Tax Year [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Operating loss carryforwards expiration Year | 2036 |  |
State and local [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Operating loss carryforwards | $ 44,500,000 |  |
Tax credit carryforward | $ 1,900,000 |  |
State and local [Member] | Earliest Tax Year [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Operating loss carryforwards expiration Year | 2020 |  |
State and local [Member] | Latest Tax Year [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Operating loss carryforwards expiration Year | 2031 |  |
Tax credit carryforward expiration year | 2026 |  |
Foreign [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Income tax expense on foreign earnings expected to be repatriated |  | 30,800,000 |
Operating loss carryforwards | $ 27,500,000 |  |
Foreign operating loss with indefinited carry forward period | $ 24,800,000 |  |
Foreign [Member] | Latest Tax Year [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Operating loss carryforwards expiration Year | 2029 |  |
China [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Income tax incentives | $ 0 | 1,884,000 | 1,398,000
Malaysia [Member} |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Income tax incentives | 3,010,000 | 3,287,000 | 4,295,000
Thailand [Member] |  |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Income tax incentives | $ 2,025,000 | 2,715,000 | $ 1,545,000
Decreases related to prior year tax positions |  | $ 7,300,000 |

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