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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2018 | Jun. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Income Taxes [Line Items] |  |  |  |  |  |
Statutory tax rate |  |  |  |  | 35.00% | 21.00%
Net discrete impacts of the enactment of the Tax Act | $ 10,588 | $ 14,778 |  | $ 10,860 |  |
Gross unrecognized tax benefits | 10,143 |  | $ 10,143 | 8,364 |  | $ 10,143
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 4,012 |  | 4,012 | 3,288 |  | 4,012
Accrued interest and penalties | $ 393 |  | $ 393 | $ 279 |  | $ 393
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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