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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |
Deferred compensation | $ 181,575 | $ 173,759
Net operating loss carryforwards | 40,266 | 48,831
Accrued expenses | 35,443 | 65,451
Unrealized loss on investments |  | 27,769
Depreciation | 12,550 | 10,055
Receivable reserves | 22,870 | 16,343
Total deferred tax assets | 292,704 | 342,208
Valuation allowance | (8,768) | (12,738)
Deferred tax assets | 283,936 | 329,470
Goodwill and other intangibles | (49,481) | (33,437)
Change in accounting method |  | (625)
Prepaid expenses | (4,557) | (4,211)
Unrealized gain on investments | (1,459) |
Other | (2,986) | (6,070)
Total deferred tax liabilities | (58,483) | (44,343)
Net deferred tax asset | $ 225,453 | $ 285,127

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