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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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Assets Including Alternative Investments, Fair Value Disclosure

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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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.

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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.

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Fair value of financial and nonfinancial obligations.

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