Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position - Associated Intent to Sell (Details)

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INVESTMENTS IN REAL ESTATE SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position - Associated Intent to Sell (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Unrealized losses reflected in other comprehensive income $ 0
Securities Intended to Sell [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 0
Amortized Cost Basis After Impairment 0
Unrealized Credit Losses 0
Unrealized Non-Credit Losses 0
Securities More Likely Than Not Required to be Sold [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 0
Amortized Cost Basis After Impairment 0
Unrealized Credit Losses 0
Securities No Intent to Sell and Not More Like Than Not to be Required to Sell - Credit Impaired [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 326,150,000
Amortized Cost Basis After Impairment 329,730,000
Unrealized Credit Losses (5,115,000)
Unrealized Non-Credit Losses (3,580,000)
Securities No Intent to Sell and Not More Like Than Not to be Required to Sell - Non-Credit Impaired [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 2,348,942,000
Amortized Cost Basis After Impairment 2,373,181,000
Unrealized Credit Losses 0
Unrealized Non-Credit Losses (24,239,000)
Securities in an Unrealized Loss Position [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 2,675,092,000
Amortized Cost Basis After Impairment 2,702,911,000
Unrealized Credit Losses (5,115,000)
Unrealized Non-Credit Losses $ (27,819,000)