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Notes Payable (Narrative) (Details) |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 06, 2019 USD ($) | Nov. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) yr | Oct. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($)
Notes Payable |  |  |  | $ 2,477,400,000 |  | $ 2,321,600,000 |
Unamortized debt discounts and debt issuance costs |  |  |  | 18,000,000.0 |  | 13,900,000 |
Unsecured Debt |  |  |  | 2,432,137,000 |  | 1,836,427,000 |
Available amount under unsecured credit facility |  |  |  | $ 891,100,000 |  |  |
Weighted Average Interest Rate | [1] |  |  | 4.00% |  |  |
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) | yr |  |  |  | 5.6 |  |  |
Notes payable, effective interest rate |  | 3.179% |  |  |  |  |
Secured Debt |  |  |  | $ 45,250,000 |  | 485,176,000 |
Derivative, Notional Amount |  | $ 300,000,000.0 |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 3.67% |  |  |
Proceeds from Issuance of Debt |  | 593,400,000 |  |  |  |  |
Debt Instrument, Face Amount |  | $ 600,000,000.0 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.15% |  |  |  |  |
Discounted notes payable face amount |  | 99.751% |  |  |  |  |
Debt Instrument, Interest Rate Before June 2026 |  |  |  | 3.84% |  |  |
Debt Instrument, Interest Rate After June 2026 |  |  |  | 3.28% |  |  |
Letter Of Credit [Member] |  |  |  |  |  |  |
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility |  |  |  | $ 50,000,000 |  |  |
Outstanding balance under credit facility |  |  |  | 8,900,000 |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Unsecured Debt | [2] |  |  | 2,332,400,000 |  | 1,736,800,000 |
Secured Debt [Member] |  |  |  |  |  |  |
Secured Debt |  |  |  | 45,300,000 |  | 485,200,000 |
Unsecured Credit Facility [Member] |  |  |  |  |  |  |
Unsecured Credit Facility, Current Borrowing Capacity |  |  |  | 600,000,000 |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  | $ 900,000,000 |  |  |
Maximum term of bid rate loans (days) |  |  |  | P180D |  |  |
Lesser of amount stated or the amount available under the unsecured credit facility |  |  |  | $ 450,000,000 |  |  |
Floating rate notes payable [Member] |  |  |  |  |  |  |
Notes Payable |  |  |  | $ 99,700,000 |  | 99,600,000 | $ 229,000,000.0
Weighted Average Interest Rate |  |  |  | 3.10% |  |  | 2.90%
Secured Notes Fixed Rate Debt due 2019 [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Repayments of Secured Debt |  |  |  | $ 439,300,000 |  |  |
4.78% Notes Due 2021 [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Unsecured Debt |  |  |  | $ 249,300,000 |  | $ 249,100,000 |
Notes payable, effective interest rate |  |  |  |  |  | 4.78% |
Debt Instrument, Maturity Date |  |  |  | Jun. 15, 2021 |  |  |
4.38% Conventional Mortgage Notes, due 2045 [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Notes payable, effective interest rate |  |  |  |  |  | 4.38% |
Secured Debt |  |  |  | $ 45,300,000 |  | $ 45,900,000 |
Debt Instrument, Maturity Date |  |  |  | Sep. 01, 2045 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Notes payable, effective interest rate |  |  |  |  | 3.353% |  |
Proceeds from Issuance of Debt |  |  | $ 296,600,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 300,000,000.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.35% |  |
Discounted notes payable face amount |  |  | 99.941% |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  | $ 12,000,000 |  |  |  |
Subsequent Event [Member] | 4.78% Notes Due 2021 [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  | $ 250,000,000 |  |
Notes payable, effective interest rate |  |  |  |  | 4.78% |  |
Subsequent Event [Member] | 4.38% Conventional Mortgage Notes, due 2045 [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Notes payable, effective interest rate |  |  |  |  | 4.38% |  |
Secured Debt |  |  |  |  | $ 45,300,000 |  |
[1] | Includes the effects of the applicable settled forward interest rate swaps.
[2] | Unamortized debt discounts and debt issuance costs of $18.0 million and $13.9 million are included in senior unsecured and secured notes payable as of September 30, 2019 and December 31, 2018, respectively.

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