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Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	$ 85,168	$ 81,639
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	252	397
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1,387)	(742)
Available-for-sale Securities	84,033	81,294
SEI-sponsored mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	7,357	8,474
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	24	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(996)	(742)
Available-for-sale Securities	6,385	7,732
Equities and other mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	2,968	2,857
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	228	68
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	3,196	2,925
Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	74,843	70,308
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	329
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(391)	0
Available-for-sale Securities	$ 74,452	$ 70,637

X

- 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
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-Section 50
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-Name Accounting Standards Codification
-Topic 320
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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