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Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 90,472	$ 85,168
Available-for-sale securities, accumulated gross unrealized gain, before tax	168	252
Available-for-sale securities, accumulated gross unrealized loss, before tax	(1,378)	(1,387)
Available-for-sale securities, fair value	89,262	84,033
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	7,325	7,357
Available-for-sale securities, accumulated gross unrealized gain, before tax	61	24
Available-for-sale securities, accumulated gross unrealized loss, before tax	(817)	(996)
Available-for-sale securities, fair value	6,569	6,385
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	3,224	2,968
Available-for-sale securities, accumulated gross unrealized gain, before tax	107	228
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	3,331	3,196
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	79,923	74,843
Available-for-sale securities, accumulated gross unrealized gain, before tax	0	0
Available-for-sale securities, accumulated gross unrealized loss, before tax	(561)	(391)
Available-for-sale securities, fair value	$ 79,362	$ 74,452

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
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-Section 50
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-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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
-SubTopic 10
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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