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Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 157,784 $ 132,507 $ 146,278 $ 122,250
Total Realized and Unrealized Gains (Losses) Included in Income 46,647 18,249 65,766 36,942
Purchases 0 0 575 0
Sales/Exits (56,164) (15,235) (68,469) (27,363)
Issuances 3,041 4,299 7,584 9,198
Distributions and Other Settlements 0 0 3 0
Transfers Out of Level 3 (3,097) (1,066) (3,526) (2,273)
Ending Balance 148,211 138,754 148,211 138,754
Fair value accounting | Equity warrant assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 156,749 131,506 145,199 121,331
Total Realized and Unrealized Gains (Losses) Included in Income 46,645 18,249 65,811 36,860
Purchases 0 0 575 0
Sales/Exits (55,568) (15,235) (67,873) (27,363)
Issuances 3,041 4,299 7,584 9,198
Distributions and Other Settlements 0 0 0 0
Transfers Out of Level 3 (3,097) (1,066) (3,526) (2,273)
Ending Balance 147,770 137,753 147,770 137,753
Fair value accounting | Non-marketable securities | Unconsolidated venture capital and private equity fund investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,035 1,001 1,079 919
Total Realized and Unrealized Gains (Losses) Included in Income 2 0 (45) 82
Purchases 0 0 0 0
Sales/Exits (596) 0 (596) 0
Issuances 0 0 0 0
Distributions and Other Settlements 0 0 3 0
Transfers Out of Level 3 0 0 0 0
Ending Balance $ 441 $ 1,001 $ 441 $ 1,001