Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance					$ 643,419	$ 709,344
Purchase accounting adjustments						(2,834)
Impairment charge	$ (19,800)	$ (1,900)	$ (40,700)		(21,718)	(40,717)
Amortization of "second component" goodwill					(560)	(1,344)
Sale of 25/7 Media reporting unit	(2,400)				(2,407)
Foreign currency translation					7,762	(21,030)
Ending balance	626,496		643,419		626,496	643,419
Domestic Operations
Goodwill [Roll Forward]
Beginning balance					349,292	353,470
Purchase accounting adjustments						(2,834)
Impairment charge					0	0
Amortization of "second component" goodwill					(560)	(1,344)
Sale of 25/7 Media reporting unit					0
Foreign currency translation					0	0
Ending balance	348,732		349,292		348,732	349,292
International and Other
Goodwill [Roll Forward]
Beginning balance					294,127	355,874
Purchase accounting adjustments						0
Impairment charge				$ (1,900)	(21,718)	(40,717)
Amortization of "second component" goodwill					0	0
Sale of 25/7 Media reporting unit					(2,407)
Foreign currency translation					7,762	(21,030)
Ending balance	$ 277,764		$ 294,127		$ 277,764	$ 294,127