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Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Measured on a recurring basis - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance $ 161,172 $ 146,278 $ 122,250
Total Realized and Unrealized Gains (Losses) Included in Income 228,914 133,922 88,439
Purchases 0 575 0
Sales/Exits (215,037) (131,352) (78,752)
Issuances 19,014 16,453 17,941
Distributions and Other Settlements 0 3 (297)
Transfers Out of Level 3 (1,846) (4,707) (3,303)
Ending Balance 192,217 161,172 146,278
Equity warrant assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 161,038 145,199 121,331
Total Realized and Unrealized Gains (Losses) Included in Income 228,944 133,910 87,982
Purchases 0 575 0
Sales/Exits (214,933) (130,392) (78,752)
Issuances 19,014 16,453 17,941
Distributions and Other Settlements 0 0 0
Transfers Out of Level 3 (1,846) (4,707) (3,303)
Ending Balance 192,217 161,038 145,199
Fair value accounting | Non-marketable securities | Unconsolidated venture capital and private equity fund investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 134 1,079 919
Total Realized and Unrealized Gains (Losses) Included in Income (30) 12 457
Purchases 0 0 0
Sales/Exits (104) (960) 0
Issuances 0 0 0
Distributions and Other Settlements 0 3 (297)
Transfers Out of Level 3 0 0 0
Ending Balance $ 0 $ 134 $ 1,079