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MORTGAGES AND OTHER NOTES PAYABLE Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) extension_option | Dec. 31, 2015 USD ($) property | Jul. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) property
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 1,369,000,000 |  | $ 1,127,500,000
Number of properties collateralized | property |  |  |  | 39 |  | 40
Minimum rate |  |  |  | 1.00% |  |
Maximum rate |  |  |  | 6.65% |  |
Total amount of credit facility |  |  |  | $ 525,000,000 |  |
Amount borrowed |  |  |  | 309,710,000 |  | $ 127,100,000
Debt extinguished |  |  |  | $ 400,000 |  |
Unsecured Debt [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 1.60% | 1.30% |
Line of Credit [Member] | Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total amount of credit facility |  |  |  | $ 50,000,000.0 | $ 50,000,000.0 |
Line of Credit [Member] | Fund II [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis spread | 2.75% |  |  |  |  |
Unused commitment fee | 2.75% |  |  |  |  |
Line of Credit [Member] | Fund II [Member] | Unsecured Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, amount | $ 25,000,000.0 |  |  |  |  |
Proceeds from credit | 12,500,000 |  |  |  |  |
Commitment threshold | $ 12,500,000 |  |  |  |  |
Line of Credit [Member] | Fund IV [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, amount |  | $ 50,000,000.0 | $ 50,000,000.0 |  |  |
Commitment threshold |  | $ 20,000,000.0 | $ 20,000,000.0 |  |  |
Number of loan extensions | extension_option |  |  | 1 |  |  |
Amount borrowed |  |  |  | $ 34,500,000 |  |
Line of Credit [Member] | Fund IV [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis spread |  | 2.75% |  |  |  |
Unused threshold fee under amount |  | 1.00% |  |  |  |
Unused threshold over amount |  | 2.75% |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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