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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |
Deferred compensation | $ 71,687 | $ 181,575
Accrued expenses | 33,957 | 35,443
Net operating loss carryforwards | 31,986 | 40,266
Receivable reserves | 22,679 | 22,870
Depreciation | 4,012 | 12,550
Total deferred tax assets | 164,321 | 292,704
Valuation allowance | (4,285) | (8,768)
Deferred tax assets | 160,036 | 283,936
Goodwill and other intangibles | (38,982) | (49,481)
Unrealized gain on investments | (11,081) | (1,459)
Prepaid expenses | (2,834) | (4,557)
Other | (1,987) | (2,986)
Total deferred tax liabilities | (54,884) | (58,483)
Net deferred tax asset | $ 105,152 | $ 225,453

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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