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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

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations related to discrete impacts of changes in U.S. tax law.

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Income Taxes [Line Items]

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