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MORTGAGES AND OTHER NOTES PAYABLE Secured and Unsecured Credit Facilities (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Jul. 31, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | $ 525,000,000 |  |
Amount borrowed |  | 309,710,000 |  | $ 127,100,000
Net borrowings (repayments) during the year ended December 31, 2015 |  | 182,610,000 |  |
Letters of Credit |  | 17,500,000 |  |
Amount available under credit facilities as of December 31, 2015 |  | 197,790,000 |  |
Unsecured Debt [Member] | Unsecured Line [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility | [1] | 150,000,000 |  |
Amount borrowed | [1] | 20,800,000 |  | 0
Net borrowings (repayments) during the year ended December 31, 2015 | [1] | 20,800,000 |  |
Letters of Credit | [1] | 17,500,000 |  |
Amount available under credit facilities as of December 31, 2015 | [1] | 111,700,000 |  |
Term Loan [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 50,000,000.0 | $ 50,000,000.0 |
Term Loan [Member] | Term Loan One [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 50,000,000 |  |
Amount borrowed |  | 50,000,000 |  | 50,000,000
Net borrowings (repayments) during the year ended December 31, 2015 |  | 0 |  |
Letters of Credit |  | 0 |  |
Amount available under credit facilities as of December 31, 2015 |  | 0 |  |
Term Loan [Member] | Term Loan Two [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 50,000,000 |  |
Amount borrowed |  | 50,000,000 |  | 0
Net borrowings (repayments) during the year ended December 31, 2015 |  | 50,000,000 |  |
Letters of Credit |  | 0 |  |
Amount available under credit facilities as of December 31, 2015 |  | 0 |  |
Term Loan [Member] | Term Loan Three [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 50,000,000 |  |
Amount borrowed |  | 50,000,000 |  | 0
Net borrowings (repayments) during the year ended December 31, 2015 |  | 50,000,000 |  |
Letters of Credit |  | 0 |  |
Amount available under credit facilities as of December 31, 2015 |  | 0 |  |
Term Loan [Member] | Fund II Line [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 25,000,000 |  |
Amount borrowed |  | 12,500,000 |  | 0
Net borrowings (repayments) during the year ended December 31, 2015 |  | 12,500,000 |  |
Letters of Credit |  | 0 |  |
Amount available under credit facilities as of December 31, 2015 |  | 12,500,000 |  |
Term Loan [Member] | Fund IV Term Loan [Member] | Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility |  | 50,000,000 |  |
Amount borrowed |  | 34,500,000 |  | 0
Net borrowings (repayments) during the year ended December 31, 2015 |  | 34,500,000 |  |
Letters of Credit |  | 0 |  |
Amount available under credit facilities as of December 31, 2015 |  | 15,500,000 |  |
Term Loan [Member] | Fund IV Revolving Subscription Line [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total amount of credit facility | [2] | 150,000,000 |  |
Amount borrowed | [2] | 91,910,000 |  | $ 77,100,000
Net borrowings (repayments) during the year ended December 31, 2015 | [2] | 14,810,000 |  |
Letters of Credit | [2] | 0 |  |
Amount available under credit facilities as of December 31, 2015 | [2] | $ 58,090,000 |  |
[1] | Includes origination and exit fees
[2] | The Fund IV revolving subscription line of credit is secured by unfunded investor capital commitments.

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.9-03.16) -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 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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