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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |
Lease liabilities | $ 181,607 |
Deferred compensation | 80,389 | $ 74,916
Receivable reserves | 33,199 | 30,252
Net operating loss carryforwards | 28,781 | 29,699
Accrued expenses | 26,166 | 19,832
Unrealized loss on investments |  | 10,635
Other | 3,210 | 3,066
Total deferred tax assets | 353,352 | 168,400
Valuation allowance | (5,042) | (3,944)
Deferred tax assets | 348,310 | 164,456
Lease ROU asset | (180,598) |
Goodwill and other intangibles | (46,625) | (42,045)
Depreciation | (7,231) | (6,629)
Unrealized gain on investments | (5,619) |
Prepaid expenses | (3,857) | (3,774)
Total deferred tax liabilities | (243,930) | (52,448)
Net deferred tax asset | $ 104,380 | $ 112,008

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