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Fair Value Measurements - Fair value hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
U.S. Treasury securities | $ 101,186 | $ 197,312
Sovereign debt | 23,885 | 42,328
Total assets | 129,071 |
Assets Including Alternative Investments, Fair Value Disclosure | 989,701 | 1,523,728
Liabilities |  |
Derivative liabilities (embedded) | 31 | 22
Total liabilities | 31 | 22
Quoted prices in active markets (Level 1) |  |
Assets |  |
U.S. Treasury securities | 0 | 0
Sovereign debt | 0 | 0
Total assets | 0 |
Liabilities |  |
Derivative liabilities (embedded) | 0 | 0
Total liabilities | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
U.S. Treasury securities | 101,186 | 197,312
Sovereign debt | 23,885 | 42,328
Total assets | 125,071 |
Liabilities |  |
Derivative liabilities (embedded) | 0 | 0
Total liabilities | 0 | 0
Significant unobservable inputs (Level 3) |  |
Assets |  |
U.S. Treasury securities | 0 | 0
Sovereign debt | 0 | 0
Total assets | 4,000 |
Liabilities |  |
Derivative liabilities (embedded) | 31 | 22
Total liabilities | $ 31 | $ 22

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. 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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