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Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Cost Amount	$ 85,296	$ 88,570
Gross Unrealized Gains	501	568
Gross Unrealized (Losses)	(2,708)	(1,155)
Fair Value	83,089	87,983
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Amount	7,382	7,369
Gross Unrealized Gains	96	110
Gross Unrealized (Losses)	(50)	(143)
Fair Value	7,428	7,336
Equities and Other Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Amount	3,483	3,456
Gross Unrealized Gains	405	458
Gross Unrealized (Losses)	0	0
Fair Value	3,888	3,914
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Amount	74,431	77,745
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(2,658)	(1,012)
Fair Value	$ 71,773	$ 76,733

X

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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)
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