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DEBT - Narrative (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2019 USD ($) mortgage_loan | Mar. 14, 2019 USD ($) mortgage_loan | Mar. 11, 2019 USD ($) swap | Mar. 01, 2019 USD ($) | Feb. 28, 2019 USD ($) | Dec. 28, 2018 USD ($) swap | Oct. 30, 2018 USD ($) | May 30, 2018 USD ($) | Sep. 21, 2017 USD ($) mortgage_loan | Oct. 31, 2018 USD ($) extension | Jun. 30, 2016 USD ($) agreement | May 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) swap | Dec. 31, 2018 USD ($) | Nov. 02, 2015 USD ($) | Aug. 13, 2015 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred loan costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,535,000 |  | $ 4,535,000 |  |  | $ 5,994,000 |  |
Deferred loan costs, accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 951,000 |  | 951,000 |  |  | 876,000 |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,911,000 | $ 0 | 29,982,000 | $ 0 |  |  |  |
Proceeds from notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 38,200,000 |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,824,000 | $ 22,800,000 | 10,824,000 | 22,800,000 |  | 22,512,000 |  |
Number of swaps terminated | swap |  |  | 2 |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Notional amount of terminated swaps |  |  | $ 120,000,000 |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 | 0 |  |  |  |
Prepayment penalties and other payments for early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,660,000 | $ 0 |  |  |  |
Accrued interest and unused commitment fee payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 571,000 |  | 571,000 |  |  | 1,574,000 |  |
Unsecured credit facility entered into in September 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, revolver | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, revolver | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 1.20% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 1.15% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 1.95% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, term loan | Base rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, term loan | Base rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  |  | 0.95% |  |  |  |  |  |  |  |
Unsecured credit facility entered into in September 2014, delayed-draw term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |
Unsecured Term Loan Facility Entered Into May 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred loan costs, accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 705,000 |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 385,000,000 |  |  |  |  |  |  |  | $ 385,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.16% |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 215,000,000 |  |  |
Write off of deferred loan costs |  |  |  |  |  |  | $ 1,872,000 |  |  |  |  |  |  |  |  |  |  | $ 1,988,000 |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 170,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of accumulated amortization |  |  |  |  |  |  | 1,064,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan Facility Entered Into May 2015 | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  | 1.60% |  |  |  |  |  |  |  |  |
Unsecured Term Loan Facility Entered Into May 2015 | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |
Unsecured Term Loan Facility Entered Into May 2015 | Base rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  | 0.60% |  |  |  |  |  |  |  |  |
Unsecured Term Loan Facility Entered Into May 2015 | Base rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |
Mortgages Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loan agreements | agreement |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Amount of loan |  |  |  |  |  |  |  |  |  |  | $ 392,000,000 |  |  |  |  |  |  |  |  |  |
Gross debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,100,000 |  | 97,100,000 |  |  | 388,100,000 |  |
Mortgage loan with a fixed interest of 4.14% per annum, due on July 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,100,000 |  | 97,100,000 |  |  | 342,100,000 |  |
Loan Backed Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from notes payable |  |  |  |  |  |  |  | $ 38,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weight average life |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,756,000 |  | $ 1,756,000 |  |  | $ 3,174,000 |  |
Loan Backed Notes | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  | 1.40% |  |  |  |  |
Loan Backed Notes | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  | 1.08% |  |  |  |  |  |  |  | 1.08% |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.07% |  |
Number of extensions | extension |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Extension option, term |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 170,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused commitment fee percentage |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused commitment fee percentage |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  | 1.55% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  |  |  |  |  | 0.55% |  |  |  |  |  |  |  |  |  |  |
7083 Hollywood Boulevard, Los Angeles, California | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  |  | $ 21,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans assumed by buyer | mortgage_loan |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Properties Used As Collateral For Loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mortgage loan with a fixed interest of 4.14% per annum, due on July 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred loan costs |  |  |  | $ 637,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of accumulated amortization |  |  |  | 170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defeased amount |  |  |  | 205,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash outlay required for defeasance |  |  |  | 224,086,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | $ 19,290,000 |  |  |  |  |
Transaction costs |  |  |  | 237,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Property, San Fransisco California | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred loan costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243,000 |  |  |  |  |
Write off of accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,000 |  |  |  |  |
Outstanding amount |  | $ 28,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 178,000 |  |  |  |  |
Number of mortgage loans assumed by buyer | mortgage_loan |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1333 Broadway, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mortgage loan with a fixed interest of 4.14% per annum, due on July 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred loan costs | $ 287,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of accumulated amortization | 82,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defeased amount | 39,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash outlay required for defeasance | 44,108,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,911,000 |  | 4,911,000 |  |  |  |  |
Transaction costs | $ 98,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans defeased | mortgage_loan | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Property, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred loan costs |  |  |  | 537,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of accumulated amortization |  |  |  | 259,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 5,603,000 |  |  |  |  |
Payment of mortgages payable |  |  |  | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment penalties and other payments for early extinguishment of debt |  |  |  | $ 5,325,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 385,000,000
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000,000 |  | $ 120,000,000 |  |  |  |  |
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedges | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
All-in rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.11% |  | 3.11% |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 120,000,000 |  | $ 10,000,000 | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  | $ 130,000,000 |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,000,000 |  | $ 210,000,000 |  |  | $ 91,000,000 |  |

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