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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Line Items] |  |  |
Tax rates |  | 35.00% |
Federal tax rate of deferred tax assets and liabilities |  | 21.00% |
Current year and prior year earnings of Company's foreign operations |  | $ 100,700 |
Foreign withholding taxes |  | $ 2,300 |
Reduction in provisional transition tax | $ 1,100 |  |
Federal tax benefit attributable to adjustments discovered | 1,900 |  |
State tax charge | 800 |  |
Estimated effective tax rate on continuing operations |  | 29.70% | 36.40%
Increase decrease in unrecognized tax benefits |  | $ 1,200 |
Foreign tax credits |  | 22,000 |
Increase decrease in deferred tax liabilities |  | $ 500 |
Percentage of AETR increased |  | 2.20% |
Estimated foreign-derived intangible income deduction |  | $ 4,500 |
Percentage of AETR decreased |  | 0.80% |
Uncertain tax positions | 2,400 |  |
Valuation allowance | $ 5,000 |  |
Earliest Tax Year [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Open tax years |  | 2007 |
Latest Tax Year [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Open tax years |  | 2018 |

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