Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	31.50%	35.00%
Continuing operations				$ 41,188	$ 50,509	$ 56,732
Reclassification of Tax Effects out of Accumulated Other Comprehensive Income					$ 0
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount				$ 7,800
Reversal of dividend withholding tax due to foreign subsidiary tax holiday				(5.10%)	0.00%	0.00%
Net operating loss carryforwards				$ 0
Unrecognized tax benefits that would impact effective tax rate				5,500
Liability where a significant change in unrecognized tax benefits is reasonably possible				$ 100
Minimum [Member] | State And Foreign Jurisdictions [Member]
Income Tax [Line Items]
Open tax years				3 years
Maximum [Member] | State And Foreign Jurisdictions [Member]
Income Tax [Line Items]
Open tax years				6 years
Prior to Tax Cuts and Jobs Act [Member]
Income Tax [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Subsequent to Tax Cuts and Jobs Act [Member]
Income Tax [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Deferred tax liabilities	$ 0				$ 0
Continuing operations	$ 4,500	$ 10,500		$ 4,500
Net Income [Member] | Subsequent to Tax Cuts and Jobs Act [Member]
Income Tax [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability				$ 7,800
AOCI Attributable to Parent [Member]
Income Tax [Line Items]
Reclassification of Tax Effects out of Accumulated Other Comprehensive Income					(12,373)
Retained Earnings [Member]
Income Tax [Line Items]
Reclassification of Tax Effects out of Accumulated Other Comprehensive Income					$ 12,373