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Supplemental Balance Sheet Information (Schedule Of Leasehold Improvements, Property And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	$ 2,964,021	$ 2,660,129
Accumulated depreciation	(1,379,710)	(1,201,439)
Leasehold improvements, property and equipment, net	1,584,311	1,458,690
Land [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	12,943	12,943
Leasehold Improvements and Buildings [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	1,921,371	1,765,464
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	198,387	182,391
Equipment [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	755,003	653,909
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, property and equipment	$ 76,317	$ 45,422

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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