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FAIR VALUE MEASUREMENT - Loans for Which Fair Value is Only Disclosed (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]                      
Valuation and Loss Provision/ (Reversal) In Current Year $ 10,377 $ 26,700 $ 20,771 $ 17,910 $ 35,871 $ 18,275 $ 16,825 $ 6,745 $ 75,758 $ 77,716 $ 18,596
Weighted Average Life (Years)                 1 year 2 months 2 days    
Reverse Mortgage Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Interest in reverse mortgage loans                 70.00%    
Performing Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Weighted Average Life (Years)                 5 years 6 months 1 day    
Residential Mortgage Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Discount Rate                 6.30% 7.60%  
Weighted Average Life (Years)                 4 years 7 months 30 days 2 years 11 months 4 days  
Loss Severity                 37.70% 30.50%  
Residential Mortgage Loans | Carrying Value                      
Mortgage Loans on Real Estate [Line Items]                      
Carrying Value 1,691,365       481,142       $ 1,691,365 $ 481,142  
Residential Mortgage Loans | Fair Value                      
Mortgage Loans on Real Estate [Line Items]                      
Fair Value 1,763,578       502,046       $ 1,763,578 $ 502,046  
Residential Mortgage Loans | Reverse Mortgage Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Discount Rate                 7.00% 7.00%  
Weighted Average Life (Years)                 4 years 6 months 12 days 4 years 6 months 16 days  
Loss Severity                 9.60% 9.50%  
Residential Mortgage Loans | Reverse Mortgage Loans | Carrying Value                      
Mortgage Loans on Real Estate [Line Items]                      
Carrying Value 6,870       11,468       $ 6,870 $ 11,468  
Residential Mortgage Loans | Reverse Mortgage Loans | Fair Value                      
Mortgage Loans on Real Estate [Line Items]                      
Fair Value 8,964       12,952       $ 8,964 $ 12,952  
Residential Mortgage Loans | Performing Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Discount Rate                 6.60% 7.40%  
Weighted Average Life (Years)                 5 years 3 months 13 days 5 years 7 months 3 days  
Prepayment Rate                 7.50% 6.20%  
CDR                 2.30% 2.10%  
Loss Severity                 42.80% 50.30%  
Residential Mortgage Loans | Performing Loans | Carrying Value                      
Mortgage Loans on Real Estate [Line Items]                      
Carrying Value 857,865       23,758       $ 857,865 $ 23,758  
Residential Mortgage Loans | Performing Loans | Fair Value                      
Mortgage Loans on Real Estate [Line Items]                      
Fair Value 866,020       24,420       $ 866,020 $ 24,420  
Residential Mortgage Loans | Non-Performing Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Discount Rate                 5.90% 7.60%  
Weighted Average Life (Years)                 4 years 7 days 2 years 8 months 29 days  
Prepayment Rate                 2.80% 2.00%  
CDR                 3.00%    
Loss Severity                 32.60% 30.00%  
Residential Mortgage Loans | Non-Performing Loans | Carrying Value                      
Mortgage Loans on Real Estate [Line Items]                      
Carrying Value 826,630       445,916       $ 826,630 $ 445,916  
Residential Mortgage Loans | Non-Performing Loans | Fair Value                      
Mortgage Loans on Real Estate [Line Items]                      
Fair Value 888,594       464,674       $ 888,594 $ 464,674  
Consumer loan bonds | Consumer Loans                      
Mortgage Loans on Real Estate [Line Items]                      
Discount Rate                 9.40% 9.30%  
Weighted Average Life (Years)                 3 years 5 months 26 days 3 years 10 months 6 days  
Prepayment Rate                 22.70% 15.40%  
CDR                 6.20% 5.70%  
Loss Severity                 92.70% 87.60%  
Consumer loan bonds | Consumer Loans | Carrying Value                      
Mortgage Loans on Real Estate [Line Items]                      
Carrying Value 1,374,263       1,799,486       $ 1,374,263 $ 1,799,486  
Consumer loan bonds | Consumer Loans | Fair Value                      
Mortgage Loans on Real Estate [Line Items]                      
Fair Value $ 1,379,746       $ 1,819,106       $ 1,379,746 $ 1,819,106