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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Investment Holdings [Line Items] |  |  |
Loan position held in secondary loan trading portfolio |  | $ 0 | $ 0
Fair Value |  | 7,627,000 |
Unfunded Commitments |  | 1,251,000 |
Hedge Funds |  |  |
Investment Holdings [Line Items] |  |  |
Fair Value | [1] | 2,325,000 |
Unfunded Commitments | [1] | $ 0 |
Redemption Frequency | [1] | Quarterly - Annually |
Redemption notice period, minimum | [1] | 30 days |
Redemption notice period, maximum | [1] | 120 days |
Private Equity Funds |  |  |
Investment Holdings [Line Items] |  |  |
Fair Value | [2] | $ 5,302,000 |
Unfunded Commitments | [2] | $ 1,251,000 |
Investments lock In period |  | 10 years |
[1] | Includes investments in hedge funds and hedge fund of funds that pursue long/short, event-driven, and activist strategies. Each hedge fund has various restrictions regarding redemption; no investment is locked-up for a period greater than one year.
[2] | Includes private equity funds and private equity fund of funds with a focus on diversified portfolios, real estate and global natural resources. Due to the illiquid nature of these funds, investors are not permitted to make withdrawals without the consent of the general partner. The lock-up period of the private equity funds can extend to 10 years.

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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