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Fair Value Disclosures (Level 3 Rollforwards) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Assets:    
Total gains (losses) (realized and unrealized) $ (42,800) $ (5,100)
Liabilities:    
Total gains/ losses (realized and unrealized) (26,400) (22,500)
Fair value, Liabilities, change in unrealized gains/(losses) included in other comprehensive income relating to instruments still held 14,600 12,700
Corporate equity securities    
Assets:    
Beginning Balance 58,426 52,192
Total gains (losses) (realized and unrealized) (8,280) 4,488
Purchases 2,792 1,410
Sales (1,934) (2,411)
Settlements 0 (66)
Issuances 0 0
Net transfers into (out of) Level 3 52,679 (37)
Ending Balance 103,683 55,576
Changes in unrealized gains/losses included in earnings relating to instruments still held (8,291) 4,603
Liabilities:    
Beginning Balance 4,487 0
Total gains/ losses (realized and unrealized) 291 (2)
Purchases (513) 0
Sales 0 80
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 10 0
Ending Balance 4,275 78
Changes in unrealized gains/losses included in earnings relating to instruments still held 65 2
Corporate debt securities    
Assets:    
Beginning Balance 7,490 9,484
Total gains (losses) (realized and unrealized) 1,269 466
Purchases 1,478 3,568
Sales (503) (3,233)
Settlements (601) (834)
Issuances 0 0
Net transfers into (out of) Level 3 15,957 1,479
Ending Balance 25,090 10,930
Changes in unrealized gains/losses included in earnings relating to instruments still held 879 498
Liabilities:    
Beginning Balance 340 522
Total gains/ losses (realized and unrealized) (189) (241)
Purchases (13,832) 0
Sales 14,079 0
Settlements 369 0
Issuances 0 0
Net transfers into (out of) Level 3 0 449
Ending Balance 767 730
Changes in unrealized gains/losses included in earnings relating to instruments still held (35) 241
CDOs and CLOs    
Assets:    
Beginning Balance 28,788 36,105
Total gains (losses) (realized and unrealized) (1,940) (6,726)
Purchases 17,594 49,201
Sales (17,833) (32,759)
Settlements (4) (1,139)
Issuances 0 0
Net transfers into (out of) Level 3 3,179 (1,538)
Ending Balance 29,784 43,144
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,698) (3,526)
Residential mortgage-backed securities    
Assets:    
Beginning Balance 17,740 19,603
Total gains (losses) (realized and unrealized) (280) 462
Purchases 0 975
Sales 0 0
Settlements (3) (27)
Issuances 0 0
Net transfers into (out of) Level 3 (487) (50)
Ending Balance 16,970 20,963
Changes in unrealized gains/losses included in earnings relating to instruments still held (250) 494
Commercial mortgage-backed securities    
Assets:    
Beginning Balance 6,110 10,886
Total gains (losses) (realized and unrealized) (306) 136
Purchases 0 12
Sales 0 0
Settlements (1,401) (41)
Issuances 0 0
Net transfers into (out of) Level 3 (139) 1,827
Ending Balance 4,264 12,820
Changes in unrealized gains/losses included in earnings relating to instruments still held 571 96
Liabilities:    
Beginning Balance 35 0
Total gains/ losses (realized and unrealized) 0 70
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 35 70
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 (70)
Other asset-backed securities    
Assets:    
Beginning Balance 42,563 53,175
Total gains (losses) (realized and unrealized) (4,159) (2,290)
Purchases 81,323 29,195
Sales (72,032) (30,060)
Settlements (1,974) (12,320)
Issuances 0 0
Net transfers into (out of) Level 3 (3,818) (1,814)
Ending Balance 41,903 35,886
Changes in unrealized gains/losses included in earnings relating to instruments still held (3,797) (1,763)
Loans and other receivables    
Assets:    
Beginning Balance 114,080 46,985
Total gains (losses) (realized and unrealized) (4,307) 814
Purchases 62,940 40,061
Sales (13,042) (27,142)
Settlements (57,479) (1,990)
Issuances 0 0
Net transfers into (out of) Level 3 1,051 19,323
Ending Balance 103,243 78,051
Changes in unrealized gains/losses included in earnings relating to instruments still held (6,187) 130
Investments at fair value    
Assets:    
Beginning Balance 205,412 396,254
Total gains (losses) (realized and unrealized) (27,333) (2,923)
Purchases 6,504 27,767
Sales (76) 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 184,507 421,098
Changes in unrealized gains/losses included in earnings relating to instruments still held (27,333) (2,923)
FXCM term loan    
Assets:    
Beginning Balance 59,120 73,150
Total gains (losses) (realized and unrealized) 2,508 450
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 0 0
Ending Balance 61,628 73,600
Changes in unrealized gains/losses included in earnings relating to instruments still held 2,508 450
Securities purchased under agreements to resell    
Assets:    
Beginning Balance 25,000  
Total gains (losses) (realized and unrealized) 0  
Purchases 0  
Sales 0  
Settlements (25,000)  
Issuances 0  
Net transfers into (out of) Level 3 0  
Ending Balance 0  
Changes in unrealized gains/losses included in earnings relating to instruments still held 0  
Loans    
Liabilities:    
Beginning Balance 9,463 6,376
Total gains/ losses (realized and unrealized) 1 (229)
Purchases (9,872) (1,411)
Sales 2,781 504
Settlements 0 0
Issuances 0 0
Net transfers into (out of) Level 3 5,486 (1,820)
Ending Balance 7,859 3,420
Changes in unrealized gains/losses included in earnings relating to instruments still held (1) 338
Net derivatives    
Liabilities:    
Beginning Balance 77,168 21,614
Total gains/ losses (realized and unrealized) (17,528) (5,348)
Purchases (278) (2,804)
Sales 5,627 3,084
Settlements 192 169
Issuances 0 0
Net transfers into (out of) Level 3 45,662 12,260
Ending Balance 110,843 28,975
Changes in unrealized gains/losses included in earnings relating to instruments still held 17,460 3,333
Long-term Debt:    
Liabilities:    
Beginning Balance 480,069 200,745
Total gains/ losses (realized and unrealized) (9,016) (16,701)
Purchases 0 0
Sales 0 0
Settlements 0 (5,665)
Issuances 128,475 92,016
Net transfers into (out of) Level 3 (56,065) 12,744
Ending Balance 543,463 283,139
Changes in unrealized gains/losses included in earnings relating to instruments still held $ (5,590) $ 4,045