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v3.3.1.900

MORTGAGE AND OTHER INDEBTEDNESS (Unsecured Lines of Credit and Unsecured Term Loans)(Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2015 USD ($) extension_option credit_line | Mar. 31, 2015 | Dec. 31, 2015 USD ($) extension_option CreditLines | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 1,241,379,000 | $ 696,396,000 |
Weighted Average Interest Rate (percent) |  |  | 4.54% | 4.93% |
Mortgage and other indebtedness |  |  | $ 4,710,628,000 | $ 4,683,333,000 |
Loan, outstanding amount |  |  | 3,485,308,000 | 4,004,064,000 |
Unsecured Term Loan 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 2,686,000 | $ 5,639,000 |
Other Variable Rate Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity |  |  |  |  | $ 3,500,000
Other Variable Rate Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 2.49% |  |
Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of one-year extension options available | extension_option |  |  | 1 |  |
Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted Average Interest Rate (percent) |  |  | 5.53% | 5.50% |
Fixed Rate Interest | Unsecured Term Loan 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted Average Interest Rate (percent) |  |  | 3.50% | 3.50% |
Unsecured lines of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of debt instruments | CreditLines |  |  | 3 |  |
Secured credit facility, borrowing capacity | $ 1,100,000,000 |  | $ 1,100,000,000 |  |
Credit facility, facility fee percentage |  |  | 0.25% |  |
Weighted-average interest rate |  |  | 1.54% |  |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 398,904,000 |  |
Unsecured lines of credit | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.20% |  |
Unsecured lines of credit | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, commitment fee percentage | 0.125% |  | 0.15% |  |
Unsecured lines of credit | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 0.875% |  | 1.00% |  |
Unsecured lines of credit | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, commitment fee percentage | 0.30% |  | 0.35% |  |
Unsecured lines of credit | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 1.55% |  | 1.75% |  |
Unsecured lines of credit | Wells Fargo Bank |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, extension fee percentage |  |  | 0.15% |  |
Unsecured lines of credit 3 and 4 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of debt instruments | credit_line | 2 |  |  |  |
Secured credit facility, borrowing capacity | $ 500,000,000 |  |  |  |
Unsecured line of credit 5 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity | $ 100,000,000 |  |  |  |
Extension option, term (years) | 1 year |  |  |  |
Unsecured line of credit 3 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity | $ 500,000,000 |  |  |  |
Extension option, term (years) | 1 year |  |  |  |
Unsecured line of credit 4 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity | $ 500,000,000 |  |  |  |
Facility A |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity |  |  | $ 500,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  | 0 |  |
Amount outstanding on letter of credit |  |  | 350,000 |  |
First Tennessee |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity |  |  | 100,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  | 6,700,000 |  |
Amount outstanding on letter of credit |  |  | 113,000 |  |
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% |  |
Facility B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility, borrowing capacity |  |  | $ 500,000,000 |  |
Mortgage and other indebtedness, variable-rate debt |  |  | 392,204,000 |  |
Amount outstanding on letter of credit |  |  | 5,464,000 |  |
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 4 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extension option, term (years) | 1 year |  |  |  |
Mortgage and other indebtedness, variable-rate debt | $ 350,000,000 |  |  |  |
Number of one-year extension options available | extension_option | 2 |  |  |  |
Weighted Average Interest Rate (percent) |  |  | 1.69% |  |
Unsecured term loan 4 | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 0.90% |  |  |  |
Unsecured term loan 4 | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 1.75% |  |  |  |
Unsecured term loan 4 | Weighted Average | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 1.35% |  |  |  |
Unsecured Term Loan 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted Average Interest Rate (percent) |  |  | 1.79% |  |
Debt instrument, face value |  |  | $ 400,000,000 |  | $ 7,000,000
Mortgage and other indebtedness |  |  | $ 400,000,000 |  |
Interest Rate at Repayment Date (percent) |  |  | 1.92% |  |
Unsecured Term Loan 1 | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.50% |  |
Unsecured Term Loan 2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face value |  |  | $ 50,000,000 |  |
Mortgage and other indebtedness |  |  | $ 50,000,000 |  |
Unsecured Term Loan 2 | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 1.90% |  | 1.55% |

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