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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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