Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Lease liabilities	$ 187,576	$ 211,524
Deferred compensation	79,081	79,068
Accrued expenses	46,539	73,835
Receivable reserves	38,432	41,963
Net operating loss carryforwards	24,837	32,727
Depreciation	1,302
Other	4,155	3,311
Total deferred tax assets	381,922	442,428
Valuation allowance	(14,515)	(11,740)
Deferred tax assets	367,407	430,688
Lease ROU asset	(186,168)	(210,670)
Goodwill and other intangibles	(54,887)	(51,189)
Unrealized gain on investments	(7,841)	(11,585)
Prepaid expenses	(7,228)	(5,396)
Depreciation		(15,371)
Total deferred tax liabilities	(256,124)	(294,211)
Net deferred tax asset	$ 111,283	$ 136,477