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DEBT OBLIGATIONS, NET - Schedule of Repayments Maturities of Long-term Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]      
2017 (last 3 months) $ 290,049,000    
2018 1,083,389,000    
2019 240,390,000    
2020 401,766,000    
2021 451,415,000    
Thereafter 2,374,553,000    
Subtotal 4,841,562,000    
Premiums included in mortgage loan financing 4,890,000    
Debt obligations 4,828,027,000    
2017 Notes | Senior Unsecured Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Debt issuance costs   $ (22,847) $ (200,000)
Senior Unsecured Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Debt issuance costs (13,649,000)    
Liability for transfers not considered sales      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Debt issuance costs (4,776,000)    
Debt obligations $ 631,480,000    
Committed Loan Repurchase and Revolving Credit Facilities      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Length of additional extension maturity periods 1 year    
Various Dates | Senior Unsecured Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Debt issuance costs $ (13,600,000)   $ (4,000,000.0)