XML 109 R60.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
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