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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Income Taxes [Line Items] |  |  |  |
Statutory tax rate | 35.00% |  | 21.00% |
Net discrete impacts of the enactment of the Tax Act | $ 14,778 |  |  | $ 10,860
Gross unrecognized tax benefits |  | $ 9,431 |  | 8,364
Unrecognized tax benefits that, if recognized, would affect the effective tax rate |  | 3,722 |  | 3,288
Accrued interest and penalties |  | $ 345 |  | $ 279
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Years remaining open to tax examination |  | 2017 |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Years remaining open to tax examination |  | 2014 |  |
Foreign Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Years remaining open to tax examination |  | 2016 |  |

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