Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Oct. 01, 2019	Sep. 30, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 70,703			$ 220,370
Restricted cash and cash equivalents	$ 26,600			$ 33,300
Restricted cash and cash equivalents, balance sheet location	us-gaap:OtherAssets
Right-of-use asset, amount	$ 15,400		$ 15,700
Lease liability, amount	15,295		$ 15,500
Cumulative effect of adopting Accounting Standards Update	$ 88	$ 394