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FAIR VALUE MEASUREMENT - Schedule of Unobservable Inputs for Fair Values of Purchase Options (Details) - Recurring basis - Level 3 $ / shares in Thousands | 6 Months Ended
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Jun. 30, 2018 $ / shares
Real Estate Loan 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Exercise price | $ 15,143
Expected volatility | 32.00%
Risk free rate | 1.70%
Expected annualized equity dividend yield | 6.80%
Real Estate Loan 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Exercise price | $ 17,377
Expected volatility | 38.00%
Risk free rate | 1.80%
Expected annualized equity dividend yield | 9.90%
Real Estate Loan 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Exercise price | $ 5,503
Expected volatility | 37.00%
Risk free rate | 1.90%
Expected annualized equity dividend yield | 6.50%

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