Summary Of Significant Accounting Policies (Other Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Other Assets [Line Items]
Other	$ 81	$ 80
Other Assets	21,354	80
Other Noncurrent Assets [Member] | Federal [Member]
Other Assets [Line Items]
Income Taxes Receivable	$ 21,273	$ 0	$ 42,100