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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounting Guidance Not Yet Effective) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) lease | Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of ground lease arrangements as a lessee (lease) | lease |  | 13 |
Future contractual lease payments |  | $ 15,113 |
Accounting Standards Update 2017-05, Unconsolidated Affiliate Impact | Scenario, Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Anticipated gains recorded with adoption of new accounting standard | $ 57,850 |  |
Accounting Standards Update 2017-05, Joint Venture Impact | Scenario, Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Anticipated gains recorded with adoption of new accounting standard | $ 902 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Revenues within the scope of ASC 606 | Pro Forma |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New accounting standard anticipated impact on retained earnings |  |  | $ 362
Sales Revenue, Net, Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Concentration risk, percent of total revenue |  | 100.00% |
Leasing revenues | Sales Revenue, Net, Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Concentration risk, percent of total revenue |  | 97.00% |
Revenues within the scope of ASC 606 | Sales Revenue, Net, Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Concentration risk, percent of total revenue |  | 2.00% |
Other revenues | Sales Revenue, Net, Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Concentration risk, percent of total revenue |  | 1.00% |

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