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Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | $ 77,890 | $ 81,639
Available-for-sale securities, accumulated gross unrealized gain, before tax | 1,168 | 397
Available-for-sale securities, accumulated gross unrealized loss, before tax | (702) | (742)
Available-for-sale securities, fair value | 78,356 | 81,294
SEI-Sponsored Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 8,351 | 8,474
Available-for-sale securities, accumulated gross unrealized gain, before tax | 17 | 0
Available-for-sale securities, accumulated gross unrealized loss, before tax | (702) | (742)
Available-for-sale securities, fair value | 7,666 | 7,732
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 2,755 | 2,857
Available-for-sale securities, accumulated gross unrealized gain, before tax | 139 | 68
Available-for-sale securities, accumulated gross unrealized loss, before tax | 0 | 0
Available-for-sale securities, fair value | 2,894 | 2,925
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 66,784 | 70,308
Available-for-sale securities, accumulated gross unrealized gain, before tax | 1,012 | 329
Available-for-sale securities, accumulated gross unrealized loss, before tax | 0 | 0
Available-for-sale securities, fair value | $ 67,796 | $ 70,637

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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=65884222&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=73527792&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=66010992&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=73527792&loc=d3e27161-111563 + Details
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