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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Investment Holdings [Line Items]
Fair Value	$ 7,441	$ 7,441
Unfunded Commitments	1,251	1,251
Hedge Funds [Member]
Investment Holdings [Line Items]
Fair Value	2,783	2,783
Unfunded Commitments	0	$ 0
Redemption Frequency		Quarterly - Annually
Investment Redemption Notice Period Minimum		30 days
Investment Redemption Notice Period Maximum		120 days
Private Equity Funds [Member]
Investment Holdings [Line Items]
Fair Value	4,658	$ 4,658
Unfunded Commitments	$ 1,251	$ 1,251
Investments Lock In Period	10 years
Maximum [Member] | Hedge Funds [Member]
Investment Holdings [Line Items]
Investments Lock In Period	1 year

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6526789

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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