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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |
Lease liabilities | $ 211,524 | $ 181,607
Deferred compensation | 79,068 | 80,389
Accrued expenses | 73,835 | 26,166
Receivable reserves | 41,963 | 33,199
Net operating loss carryforwards | 32,727 | 28,781
Other | 3,311 | 3,210
Total deferred tax assets | 442,428 | 353,352
Valuation allowance | (11,740) | (5,042)
Deferred tax assets | 430,688 | 348,310
Lease ROU asset | (210,670) | (180,598)
Goodwill and other intangibles | (51,189) | (46,625)
Depreciation | (15,371) | (7,231)
Unrealized gain on investments | (11,585) | (5,619)
Prepaid expenses | (5,396) | (3,857)
Total deferred tax liabilities | (294,211) | (243,930)
Net deferred tax asset | $ 136,477 | $ 104,380

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