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MORTGAGE LOAN RECEIVABLES - Mortgage Loan Receivables by Loan Type (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
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Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | $ 2,144,704 |  | $ 1,954,878 |  |  |
Provision for loan losses | (3,550) | $ (3,400) | (3,100) | $ (2,950) | $ (2,800) | $ (2,500)
Carrying Value | 2,128,343 |  | 1,939,008 |  |  |
First mortgage loan, held for sale |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | 333,488 |  | 417,955 |  |  |
Carrying Value | 333,531 |  | 417,955 |  |  |
Mortgage loan receivables held for sale |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | 333,488 |  | 417,955 |  |  |
Carrying Value | 333,531 |  | 417,955 |  |  |
First mortgage loan, held for investment |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | 1,524,080 |  | 1,373,476 |  |  |
Carrying Value, Gross | 1,512,731 |  | 1,361,754 |  |  |
Mezzanine loan |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | 287,136 |  | 163,447 |  |  |
Carrying Value, Gross | 285,631 |  | 162,399 |  |  |
Mortgage loan receivables held for investment |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Outstanding Face Amount | 1,811,216 |  | 1,536,923 |  |  |
Carrying Value, Gross | 1,798,362 |  | 1,524,153 |  |  |
Provision for loan losses | (3,550) |  | (3,100) |  |  |
Carrying Value | $ 1,794,812 |  | $ 1,521,053 |  |  |

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- Definition Amount of the contractual principal due as of the balance sheet date of the mortgage loan (face amount). + References No definition available. + Details
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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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