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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |
Deferred compensation | $ 74,916 | $ 71,687
Receivable reserves | 30,252 | 22,679
Net operating loss carryforwards | 29,699 | 31,986
Accrued expenses | 19,832 | 33,957
Unrealized loss on investments | 10,635 |
Depreciation |  | 4,012
Other | 3,066 |
Total deferred tax assets | 168,400 | 164,321
Valuation allowance | (3,944) | (4,285)
Deferred tax assets | 164,456 | 160,036
Goodwill and other intangibles | (42,045) | (38,982)
Depreciation | (6,629) |
Prepaid expenses | (3,774) | (2,834)
Unrealized gain on investments |  | (11,081)
Other |  | (1,987)
Total deferred tax liabilities | (52,448) | (54,884)
Net deferred tax asset | $ 112,008 | $ 105,152

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