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FAIR VALUE - Recurring RF (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Changes in the fair value of the Level III investments      
Transfers from Level I to Level II $ 0 $ 0  
Parent Company      
Changes in the fair value of the Level III investments      
Balance, beginning of period 107,455 45,348 $ 45,348
Deconsolidation of funds   17,815  
Purchases 6,503 5,003  
Sales (775) (763)  
Realized and unrealized appreciation (depreciation), net (862) (1,232)  
Balance, end of period 112,321 66,171 107,455
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date (1,173) (1,510)  
Parent Company | Fixed income asset      
Changes in the fair value of the Level III investments      
Balance, beginning of period 55,752    
Deconsolidation of funds   17,815  
Purchases 3 3  
Sales (775) (763)  
Realized and unrealized appreciation (depreciation), net (862) (1,232)  
Balance, end of period 54,118 15,823 55,752
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date (1,173) (1,510)  
Parent Company | Private Investment Partnership Interests      
Changes in the fair value of the Level III investments      
Balance, beginning of period 51,703 45,348 45,348
Purchases 6,500 5,000  
Balance, end of period 58,203 50,348 51,703
Consolidated Funds      
Changes in the fair value of the Level III investments      
Balance, beginning of period 455,894 5,452,295 5,452,295
Deconsolidation of funds     (4,982,308)
Transfer in 46,470 26,144  
Accounting change due to the adoption of ASU 2014-13 (74,558) (89,214)  
Purchases 26,769 44,839  
Sales (9,247) (24,861)  
Accrued discounts/premiums 737 (1,125)  
Realized and unrealized appreciation (depreciation), net 7,443 (32,007)  
Balance, end of period 453,508 393,763 455,894
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date 5,478 (31,427)  
Consolidated Funds | Equity securities      
Changes in the fair value of the Level III investments      
Balance, beginning of period 129,809 3,263,311 3,263,311
Deconsolidation of funds     (3,080,402)
Transfer in 15,759    
Accounting change due to the adoption of ASU 2014-13 (345)    
Sales   (1,689)  
Realized and unrealized appreciation (depreciation), net (3,418) (7,185)  
Balance, end of period 141,804 174,035 129,809
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date (3,419) (8,932)  
Consolidated Funds | Fixed income asset      
Changes in the fair value of the Level III investments      
Balance, beginning of period 249,490 2,192,395 2,192,395
Deconsolidation of funds     (1,897,304)
Transfer in 30,711 26,144  
Accounting change due to the adoption of ASU 2014-13 (74,213) (89,214)  
Purchases 19,469 44,835  
Sales (9,443) (23,171)  
Accrued discounts/premiums 453 (858)  
Realized and unrealized appreciation (depreciation), net (4,258) (18,706)  
Balance, end of period 212,209 234,121 249,490
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date (6,032) (14,877)  
Consolidated Funds | Private Investment Partnership Interests      
Changes in the fair value of the Level III investments      
Balance, beginning of period 86,902 17,582 17,582
Deconsolidation of funds     (17,582)
Purchases 7,300    
Sales (300)    
Realized and unrealized appreciation (depreciation), net 9,719    
Balance, end of period 103,621   86,902
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date 9,635    
Consolidated Funds | Other Financial Instrument [Member]      
Changes in the fair value of the Level III investments      
Balance, beginning of period (10,307) (20,993) (20,993)
Deconsolidation of funds     12,980
Purchases   4  
Sales 496 (1)  
Accrued discounts/premiums 284 (267)  
Realized and unrealized appreciation (depreciation), net 5,400 (6,116)  
Balance, end of period (4,127) (14,393) $ (10,307)
Increase (decrease) in unrealized appreciation (depreciation) included in earnings related to financial assets still held at the reporting date $ 5,294 $ (7,618)