Basis Of Presentation And Summary Of Significant Accounting Policies (Impact Of Restatement On Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019		Mar. 31, 2019	[2]	Dec. 31, 2018	[2]	Jun. 30, 2018	[2]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss	$ (218,196)	$ (191,212)	$ (196,046)	[1],[2]	$ (200,405)		$ (198,374)		$ (184,538)
Retained earnings	$ 485,871		525,349	[1],[2]
DNI Discontinued Operations Presentation [Member] | Scenario Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss			(199,273)
Retained earnings			528,576
DNI Discontinued Operations Presentation [Member] | Restatement Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss			3,227
Retained earnings			$ (3,227)

[1] Derived from audited financial statements.

[2] Refer to Note 1