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Fair Value Measurements - Schedule of investments, categorized by the level of the fair value hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Equity securities | $ 1,000 |
Private common equity securities | 3,000 |
Total equities | 4,000 |
U.S. Treasury securities | 101,186 | $ 197,312
Sovereign debt | 23,885 | 42,328
Total debt securities | 125,071 | 239,640
Total assets | 129,071 |
Investments in funds valued at NAV | 860,630 | 1,284,088
Assets Including Alternative Investments, Fair Value Disclosure | 989,701 | 1,523,728
Liabilities |  |
Total liabilities | 31 | 22
Derivative liabilities (embedded) | 31 | 22
Quoted prices in active markets (Level 1) |  |
Assets |  |
Equity securities | 0 |
Private common equity securities | 0 |
Total equities | 0 |
U.S. Treasury securities | 0 | 0
Sovereign debt | 0 | 0
Total debt securities | 0 | 0
Total assets | 0 |
Liabilities |  |
Total liabilities | 0 | 0
Derivative liabilities (embedded) | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Equity securities | 0 |
Private common equity securities | 0 |
Total equities | 0 |
U.S. Treasury securities | 101,186 | 197,312
Sovereign debt | 23,885 | 42,328
Total debt securities | 125,071 | 239,640
Total assets | 125,071 |
Liabilities |  |
Total liabilities | 0 | 0
Derivative liabilities (embedded) | 0 | 0
Significant unobservable inputs (Level 3) |  |
Assets |  |
Equity securities | 1,000 |
Private common equity securities | 3,000 |
Total equities | 4,000 |
U.S. Treasury securities | 0 | 0
Sovereign debt | 0 | 0
Total debt securities | 0 | 0
Total assets | 4,000 |
Liabilities |  |
Total liabilities | 31 | 22
Derivative liabilities (embedded) | $ 31 | $ 22

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by foreign governments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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