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