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DEBT - Additional (Details) |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 21, 2015 USD ($) | Jun. 30, 2016 USD ($) Property | Dec. 31, 2015 USD ($) | Apr. 21, 2016 USD ($) | Jan. 15, 2016 USD ($) | Apr. 07, 2015 USD ($) | Sep. 05, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate for all borrowings, after giving effect to interest rate derivatives (as a percent) |  | 3.84% | 3.90% |  |  |  |
Debt instrument, effective interest rate |  | 6.22% |  |  |  |  |
Number of properties that served as collateral for loans | Property |  | 44 |  |  |  |  |
Long-term debt |  | $ 622,397,000 | $ 671,536,000 |  |  |  |
$150 Million Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 3.64% |  |  |  |  |
Secured and unsecured debt | Total term loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 628,600,000 |  |  |  |  |
Secured debt | Total term loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 338,600,000 |  |  |  |  |
Unsecured debt | $450 Million Senior Unsecured Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | 450,000,000.0 |  |  |  |  |
Maximum borrowing capacity |  | 450,000,000.0 |  |  | $ 450,000,000 |  |
Line of credit outstanding |  | 150,000,000.0 |  |  |  |  |
Amount available for borrowing |  | 300,000,000.0 |  |  |  |  |
Maximum increase in borrowing capacity available through accordion feature option |  | 150,000,000.0 |  |  |  |  |
Unsecured debt | $300 Million Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 300,000,000 |  |
Unsecured debt | $150 Million Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 150,000,000.0 |  |
Unsecured debt | $300 Million Senior Unsecured Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 300,000,000.0 |  |  |  |
Maximum borrowing capacity |  |  | 300,000,000.0 |  |  |  |
Line of credit outstanding |  | $ 170,000,000 | 170,000,000 |  |  |  |
Amount available for borrowing |  |  | 130,000,000 |  |  |  |
Unsecured debt | $225 Million Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 225,000,000 |  |  |  |
Unsecured debt | $75 Million Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 75,000,000 |  |  |  |
Unsecured debt | 2015 Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 125,000,000 |
Debt instrument, effective interest rate |  | 2.43% |  |  |  |  |
Accordion feature additional commitment |  |  |  | $ 15,000,000 |  |  |
Amount drawn | $ 15,000,000 |  |  |  |  |  |
Designated as hedges | Interest rate swaps |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  | $ 75,000,000 | $ 75,000,000 |  |  |  |
Designated as hedges | Cash flow hedges | Interest rate swaps |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  | $ 75,000,000.0
Fixed interest rate (as a percent) |  | 2.04% |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 2.13% |  |  |  |  |
Revolving Credit Facility | Option One | Minimum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt basis spread on variable rate |  | 1.50% |  |  |  |  |
Revolving Credit Facility | Option One | Maximum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt basis spread on variable rate |  | 2.25% |  |  |  |  |
Revolving Credit Facility | Option Two | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt basis spread on variable rate |  | 1.00% |  |  |  |  |
Revolving Credit Facility | Option Two | Federal Funds Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt basis spread on variable rate |  | 0.50% |  |  |  |  |
Revolving Credit Facility | Option Two | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, base rate margin |  | 0.50% |  |  |  |  |
Revolving Credit Facility | Option Two | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, base rate margin |  | 1.25% |  |  |  |  |

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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 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 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 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 + Details
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