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MORTGAGE AND OTHER INDEBTEDNESS, NET (Senior Unsecured Notes, Unsecured Lines of Credit and Unsecured Term Loans)(Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) extension_option | Dec. 31, 2017 USD ($) extension_option credit_line | Jul. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 4.74% |  | 4.82%
Unamortized deferred financing costs |  |  |  | $ 18,938,000 |  | $ 17,855,000
Mortgage and other indebtedness, variable-rate debt |  |  |  | $ 1,090,810,000 |  | 888,770,000
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of debt instruments (loan) | credit_line |  |  |  | 3 |  |
Basis spread on variable rate |  |  |  | 1.20% |  |
Credit facility, facility fee percentage |  |  |  | 0.25% |  |
Weighted-average interest rate |  |  |  | 2.56% |  |
Secured credit facility, borrowing capacity |  |  |  | $ 1,100,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  | $ 93,787,000 |  |
Unsecured lines of credit | Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, extension fee percentage |  |  |  | 0.15% |  |
Wells Fargo - Facility A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured credit facility, borrowing capacity |  |  |  | $ 500,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  | 0 |  |
First Tennessee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured credit facility, borrowing capacity |  |  |  | 100,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  | 55,899,000 |  |
Additional secured and unsecured lines of credit with commitment |  |  |  | $ 20,000,000 |  |
First Tennessee | Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, extension fee percentage |  |  |  | 0.20% |  |
Wells Fargo - Facility B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured credit facility, borrowing capacity |  |  |  | $ 500,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  | 37,888,000 |  |
Unsecured Line of Credit, Facilities A and B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional secured and unsecured lines of credit with commitment |  |  |  | 30,000,000 |  |
Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  |  | $ 350,000,000 |  | 50,000,000
Basis spread on variable rate |  |  |  | 1.35% |  |
Extension option, term |  |  |  | 1 year |  |
Interest rate |  |  |  | 2.71% |  |
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  | $ 490,000,000 |  |  | $ 400,000,000
Weighted average interest rate |  |  |  | 3.01% |  |
Extension option, term |  |  | 1 year |  |  |
Number of extension options available (extension option) | extension_option |  |  | 2 |  |  |
Interest rate |  |  |  | 2.86% |  |
Other | Scenario, Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  |  |  | $ 300,000,000 |
Unsecured Term Loan 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  | $ 45,000,000 |  |  |
Extension option, term |  |  | 1 year |  |  |
LIBOR | Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |  |
LIBOR | Unsecured Term Loan 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.65% |  |  |
Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice required to redeem debt |  |  |  | 30 days |  |
Number of extension options available (extension option) | extension_option |  |  |  | 1 |  |
Minimum | Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.875% |  |
Credit facility, commitment fee percentage |  |  |  | 0.125% |  |
Minimum | LIBOR | Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.90% |  |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice required to redeem debt |  |  |  | 60 days |  |
Maximum | Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.55% |  |
Credit facility, commitment fee percentage |  |  |  | 0.30% |  |
Maximum | LIBOR | Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.75% |  |
Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 5.37% |  | 5.48%
Senior unsecured notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  |  | $ 450,000,000 |  |
Senior unsecured notes due 2023 | Treasury Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate (percent) |  |  |  | 0.40% |  |
Senior unsecured notes due 2023 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 5.25% |  | 5.25%
Senior unsecured notes due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  |  | $ 300,000,000 |  |
Debt instrument, unamortized discount |  |  |  | $ 54,000 |  | $ 61,000
Senior unsecured notes due 2024 | Treasury Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate (percent) |  |  |  | 0.35% |  |
Senior unsecured notes due 2024 | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets |  |  |  | 40.00% |  |
Senior unsecured notes due 2024 | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets |  |  |  | 45.00% |  |
Senior unsecured notes due 2024 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 4.60% |  | 4.60%
Senior unsecured notes due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face value |  |  |  | $ 625,000,000 |  |
Proceeds from mortgage and other indebtedness | $ 225,000,000 | $ 225,000,000 |  |  |  |
Unamortized deferred financing costs |  | 1,879,000 |  |  |  |
Debt instrument, unamortized discount |  | $ 3,938,000 |  | $ 9,152,000 |  | $ 5,740,000
Proceeds from debt | $ 219,183,000 |  |  |  |  |
Senior unsecured notes due 2026 | Treasury Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate (percent) |  |  |  | 0.50% |  |
Senior unsecured notes due 2026 | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets |  |  |  | 40.00% |  |
Senior unsecured notes due 2026 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 5.95% |  | 5.95%
Senior Notes Due 2023 and 2024 | Fixed Rate Interest | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increase in variable interest rate basis |  |  |  | 0.25% |  |
Senior Notes Due 2023 and 2024 | Fixed Rate Interest | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increase in variable interest rate basis |  |  |  | 1.00% |  |
Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  | $ 3,024,000 |  | $ 3,448,000
Senior Unsecured Notes | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets |  |  |  | 40.00% |  |
Senior Unsecured Notes | Actual |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets |  |  |  | 23.00% |  |

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