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Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains (losses) (realized and unrealized) $ 21,600 $ 102,200
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains/ losses (realized and unrealized) (161,400) 72,100
Fair value, liabilities, change in unrealized gains/(losses) included in other comprehensive income relating to instruments still held 32,100 (40,900)
Corporate equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 87,647 75,904
Total gains (losses) (realized and unrealized) 1,824 2,339
Purchases 2,079 4,805
Sales (706) (4,647)
Settlements (651) 0
Issuances 0 0
Net transfers into (out of) Level 3 23,729 23,664
Ending Balance 113,922 102,065
Changes in unrealized gains/losses included in earnings relating to instruments still held 1,065 1,165
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 4,635 4,434
Total gains/ losses (realized and unrealized) (3,447) 9
Purchases (812) 0
Sales 5,050 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 240 0
Ending Balance 5,666 4,443
Changes in unrealized gains/losses included in earnings relating to instruments still held 3,447 (22)
Corporate debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 11,803 23,146
Total gains (losses) (realized and unrealized) (1,176) 266
Purchases 118,970 130
Sales (103,602) (6)
Settlements (9) 0
Issuances 0 0
Net transfers into (out of) Level 3 16,372 (16,725)
Ending Balance 42,358 6,811
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,929) 297
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 482 141
Total gains/ losses (realized and unrealized) (8,866) 1,430
Purchases (63,714) 0
Sales 66,976 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 12,430 0
Ending Balance 7,308 1,571
Changes in unrealized gains/losses included in earnings relating to instruments still held 5,210 (1,430)
CDOs and CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 31,946 17,972
Total gains (losses) (realized and unrealized) (671) 3,840
Purchases 13,523 11,427
Sales (7,740) (8,007)
Settlements (1,643) (5,806)
Issuances 0 0
Net transfers into (out of) Level 3 9,804 13,773
Ending Balance 45,219 33,199
Changes in unrealized gains/losses included in earnings relating to instruments still held (906) 3,214
Sovereign obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 0  
Total gains (losses) (realized and unrealized) (306)  
Purchases 3,780  
Sales (3,451)  
Settlements 0  
Issuances 0  
Net transfers into (out of) Level 3 0  
Ending Balance 23  
Changes in unrealized gains/losses included in earnings relating to instruments still held (60)  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 0  
Total gains/ losses (realized and unrealized) (1,362)  
Purchases (99,374)  
Sales 101,911  
Settlements 0  
Issuances 0  
Net transfers into (out of) Level 3 (16)  
Ending Balance 1,159  
Changes in unrealized gains/losses included in earnings relating to instruments still held 54  
Residential mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,477 21,826
Total gains (losses) (realized and unrealized) (69) 1,327
Purchases 0 791
Sales (187) (627)
Settlements (35) (514)
Issuances 0 0
Net transfers into (out of) Level 3 0 (1,111)
Ending Balance 1,186 21,692
Changes in unrealized gains/losses included in earnings relating to instruments still held (44) 1,347
Commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 2,333 2,003
Total gains (losses) (realized and unrealized) 1,177 (29)
Purchases 0 1,105
Sales 0 (393)
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 222 (15)
Ending Balance 3,732 2,671
Changes in unrealized gains/losses included in earnings relating to instruments still held 1,655 97
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 210 35
Total gains/ losses (realized and unrealized) 0 0
Purchases 0 (35)
Sales 105 35
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 315 35
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 0
Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 93,524 79,995
Total gains (losses) (realized and unrealized) 2,033 2,361
Purchases 11,588 14,604
Sales (14,485) (20,909)
Settlements (14,269) (8,449)
Issuances 0 0
Net transfers into (out of) Level 3 (16,009) (7,008)
Ending Balance 62,382 60,594
Changes in unrealized gains/losses included in earnings relating to instruments still held (3,661) 1,721
Loans and other receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 135,239 134,636
Total gains (losses) (realized and unrealized) (4,737) 14,077
Purchases 11,549 8,758
Sales (17,710) (44,427)
Settlements 0 (66)
Issuances 0 0
Net transfers into (out of) Level 3 13,601 36,106
Ending Balance 137,942 149,084
Changes in unrealized gains/losses included in earnings relating to instruments still held (4,585) 14,091
Investments at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 154,373 213,946
Total gains (losses) (realized and unrealized) 32,034 76,257
Purchases 14,249 4,855
Sales (6,826) (30,159)
Settlements (615) (3,542)
Issuances 0 0
Net transfers into (out of) Level 3 (23,407) (41,816)
Ending Balance 169,808 219,541
Changes in unrealized gains/losses included in earnings relating to instruments still held 28,557 72,173
FXCM term loan    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 50,455 59,455
Total gains (losses) (realized and unrealized) (120) 2,677
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 50,335 62,132
Changes in unrealized gains/losses included in earnings relating to instruments still held (120) 2,677
Loans to and investments in associated companies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 30,842 40,185
Total gains (losses) (realized and unrealized) (8,362) (788)
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 22,480 39,397
Changes in unrealized gains/losses included in earnings relating to instruments still held (8,362) (788)
Loans    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 15,770 16,635
Total gains/ losses (realized and unrealized) (46) 1,559
Purchases (13,125) (6,821)
Sales 2,695 3,358
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 6,247 185
Ending Balance 11,541 14,916
Changes in unrealized gains/losses included in earnings relating to instruments still held (135) (1,559)
Net derivatives    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 67,769 26,017
Total gains/ losses (realized and unrealized) (54,836) 43,727
Purchases 0 0
Sales 0 12,670
Settlements 0 (92)
Issuances 35,069 0
Net transfers into (out of) Level 3 (232) 223,184
Ending Balance 47,770 305,506
Changes in unrealized gains/losses included in earnings relating to instruments still held 53,352 (43,727)
Other secured financings    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 25,905 1,543
Total gains/ losses (realized and unrealized) 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 6,472 625
Net transfers into (out of) Level 3 0 0
Ending Balance 32,377 2,168
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 0
Long-term debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 881,732 676,028
Total gains/ losses (realized and unrealized) (92,871) 25,357
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 23,753 21,730
Net transfers into (out of) Level 3 (18,154) 0
Ending Balance 794,460 723,115
Changes in unrealized gains/losses included in earnings relating to instruments still held $ 60,739 $ 15,501