v3.5.0.2

LOANS RECEIVABLE AND INVESTMENTS - Narrative 2 (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 28, 2016 USD ($) | Feb. 29, 2016 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) loan | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Proceeds from sale of loans |  |  |  | $ 198,500,000 |  | $ 97,000,000 |
Investment in loans receivable and other |  |  |  | $ 154,949,000 | $ 74,386,000 |  |
Gain on repayment of loans receivable |  |  |  |  |  | $ 1,900,000 |
Unsecured Debt |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  | 1 |
Debt instrument, face amount |  |  |  |  |  | $ 20,000,000 |
Secured Debt |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of loans | loan |  |  |  | 3 |  | 1 |
Debt instrument, face amount |  |  |  |  |  | $ 78,400,000 |
Secured mortgage loans and other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Recognized gain on sale of investments |  |  |  | $ 8,700,000 |  |  |
Investment in loans receivable and other |  | $ 140,000,000 |  |  |  |  |
Secured loan, stated interest rate, percentage |  | 9.95% |  |  |  |  |
Number of loans sold | loan |  |  |  |  |  | 3 |
Non-mortgage loans receivable |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of loans sold | loan |  |  |  |  |  | 1 |
Corporate Debt Securities |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Recognized gain on sale of investments |  |  | $ 5,800,000 |  |  |  |
Available-for-sale securities, amortized cost basis |  |  | 71,000,000 |  |  |  |
Proceeds from sale of investment |  |  | $ 76,800,000 |  |  |  |
Unrealized gain on investment |  |  |  |  |  |  | $ 5,000,000
Wexford Acquisition | Non-mortgage loans receivable |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of loans | loan |  |  |  | 3 |  |  |
Loans receivable |  |  |  | $ 13,371,496 |  |  |
Subsequent Event | LHP | Secured Debt |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 700,000,000 |  |  |  |  |  |
Debt instrument, term of loan | 5 years |  |  |  |  |  |
Interest rate | 8.00% |  |  |  |  |  |

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