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Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Investment Available for Sale, Cost Amount | $ 88,570 | $ 85,168
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 568 | 252
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,155) | (1,387)
Available-for-sale Securities | 87,983 | 84,033
SEI-sponsored mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Available for Sale, Cost Amount | 7,369 | 7,357
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 110 | 24
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (143) | (996)
Available-for-sale Securities | 7,336 | 6,385
Equities and other mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Available for Sale, Cost Amount | 3,456 | 2,968
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 458 | 228
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities | 3,914 | 3,196
Debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Available for Sale, Cost Amount | 77,745 | 74,843
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,012) | (391)
Available-for-sale Securities | $ 76,733 | $ 74,452

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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