Goodwill and Intangible Assets (Schedule of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Net	$ 31,148		$ 31,148		$ 33,743
Affiliate relationships estimated useful life			24 years
Finite Lived Intangible Assets, Amortization Expense	865	$ 865	$ 2,595	$ 2,595
Affiliate Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Affiliate relationships	83,044		83,044		83,044
Less: accumulated amortization	(51,896)		(51,896)		(49,301)
Net	$ 31,148		$ 31,148		$ 33,743