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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	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	$ 0	$ 14,778		$ 10,860
Gross unrecognized tax benefits	8,779		$ 8,779	8,364
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	3,457		3,457	3,288
Accrued interest and penalties	$ 302		$ 302	$ 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	2008

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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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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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