Restructuring Costs And Other Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Lease Impairment Costs [Member]
Restructuring costs and other charges	$ 44,000
Severance And Employee Costs [Member]
Restructuring costs and other charges	6,000	$ 6,000
Other Restructuring [Member]
Restructuring costs and other charges	4,000
Successor [Member]
Restructuring costs and other charges	$ 54,000
Predecessor [Member]
Restructuring costs and other charges		$ 2,000