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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Cumulative undistributed earnings of foreign subsidiaries |  |  |  | $ 928,000
Foreign earnings repatriated |  | $ 522,000 |  |
Income tax incentives |  | $ 8,247 | $ 7,333 |
Net impact of tax incentives, per diluted share |  | $ 0.17 | $ 0.15 |
Unrecognized tax benefits including interest and penalties |  | $ 300 |  |
Interest on unrecognized tax |  | 47 |  |
Decreases related to prior year tax positions |  | $ 500 |  |
State And Local Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense on foreign earnings expected to be repatriated | $ 9,400 |  |  |
Foreign Country [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense on foreign earnings expected to be repatriated | $ 30,700 |  |  |
China [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holidays expiration date |  | 2018 |  |
Income tax incentives |  | $ 1,449 | $ 888 |
Malaysia [Member} |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holidays expiration date |  | 2021 |  |
Income tax incentives |  | $ 3,219 | 3,151 |
Thailand [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holidays expiration date |  | 2028 |  |
Income tax incentives |  | $ 3,579 | $ 3,294 |

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- Definition Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 + Details
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