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v3.8.0.1

Notes Payable (Summary Of Indebtedness) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Unsecured Debt | $ 1,338,628 | $ 1,583,236
Secured notes payable | 865,970 | 897,352
Total notes payable | 2,204,600 | 2,480,600
Value Of Real Estate Assets At Cost Subject To Secured Notes | 1,534,900 | 1,598,900
Senior Unsecured Notes [Member] |  |
Unsecured Debt | 1,338,600 | 1,583,200
Five Point Eight three Percentage Notes Due2017 [Member] | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 0 | 246,600
Notes payable, effective interest rate | 5.83% |
Debt Instrument, Maturity Date | May 15, 2017 |
4.78% Notes Due 2021 | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 248,700 | 248,400
Notes payable, effective interest rate | 4.78% |
Debt Instrument, Maturity Date | Jun. 15, 2021 |
3.15% Notes Due 2022 | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 346,600 | 346,000
Notes payable, effective interest rate | 3.15% |
Debt Instrument, Maturity Date | Dec. 15, 2022 |
5.07% Notes Due 2023 | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 247,600 | 247,200
Notes payable, effective interest rate | 5.07% |
Debt Instrument, Maturity Date | Jun. 15, 2023 |
4.36% Notes Due 2024 | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 248,500 | 248,200
Notes payable, effective interest rate | 4.36% |
Debt Instrument, Maturity Date | Jan. 15, 2024 |
3.68% Notes Due 2024 | Senior Unsecured Notes [Member] |  |
Unsecured Debt | $ 247,200 | 246,800
Notes payable, effective interest rate | 3.68% |
Debt Instrument, Maturity Date | Sep. 15, 2024 |
Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member] |  |
Secured notes payable | $ 866,000 | 866,700
Secured Notes 2.18% Floating Rate Tax Exempt Mortgage Note Due 2028 | Secured Debt [Member] |  |
Secured notes payable | 0 | 30,700
Secured Notes 1.92% Floating Rate [Member] | Secured Debt [Member] |  |
Secured notes payable | $ 175,000 | $ 175,000
Minimum [Member] | Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member] |  |
Notes payable, effective interest rate | 1.92% |
Debt Instrument, Maturity Date | Oct. 01, 2018 |
Minimum [Member] | Secured Notes 1.92% Floating Rate [Member] | Secured Debt [Member] |  |
Notes payable, effective interest rate | 1.92% |
Maximum [Member] | Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member] |  |
Notes payable, effective interest rate | 5.77% |
Debt Instrument, Maturity Date | Sep. 01, 2045 |
Short-term Debt [Member] |  |
Debt Instrument, Maturity Date | May 14, 2018 |

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