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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
U.S. Deferred tax benefit | $ 9,262 | $ 7,055 | $ (12,781)
Net change in total deferred tax asset valuation allowance | 200 | 1,200 | 19,500
Cumulative undistributed earnings of foreign subsidiaries | 928,000 |  |
Income tax incentives | $ 7,238 | $ 6,716 | $ 13,693
Net impact of tax incentives, per diluted share | $ 0.15 | $ 0.13 | $ 0.26
Unrecognized tax benefits including interest and penalties | $ 800 |  |
Interest on unrecognized tax | 100 |  |
Accrued income tax penalties and interest on unrecognized tax benefits | 100 | $ 100 | $ 3,300
Interest and penalties included in income tax expense | 0 | 0 | 100
Additional reserve for uncertain tax benefits | 894 | 89 | 800
Decrease in unrecognized tax benefits reserve due to expiration of statute of limitations | 0 | 5,079 | 1,653
Decreases related to prior year tax positions | 8,197 | 333 | 789
U.S. Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Mandatory deemed repatriation of undistributed foreign earnings | 101,600 |  |
U.S. Accrued Income Taxes | 87,700 |  |
U.S. Accrued Income Taxes Noncurrent | 80,700 |  |
U.S. Deferred tax benefit | (3,900) |  |
Net change in total deferred tax asset valuation allowance |  |  | 19,600
Operating loss carryforwards | $ 32,400 |  |
U.S. Federal [Member] | Earliest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration Year | 2025 |  |
U.S. Federal [Member] | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration Year | 2036 |  |
State and local [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | $ 77,500 |  |
Tax credit carryforward | $ 2,000 |  |
State and local [Member] | Earliest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration Year | 2018 |  |
State and local [Member] | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration Year | 2031 |  |
Foreign [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | $ 25,700 |  |
Foreign operating loss with indefinited carry forward period | $ 24,600 |  |
Foreign [Member] | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards expiration Year | 2027 |  |
China [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income tax incentives | $ 1,398 | 1,302 | 5,347
China [Member] | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income tax holidays expiration date | 2018 |  |
Malaysia [Member} |  |  |
Income Taxes [Line Items] |  |  |
Income tax incentives | $ 4,295 | 2,346 | 2,075
Malaysia [Member} | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income tax holidays expiration date | 2021 |  |
Thailand [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income tax incentives | $ 1,545 | $ 3,068 | $ 6,271
Decreases related to prior year tax positions | $ 7,300 |  |
Thailand [Member] | Latest Tax Year [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income tax holidays expiration date | 2028 |  |

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