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Notes Payable (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2018 USD ($) | May 31, 2018 | Aug. 31, 2015 USD ($) | Feb. 15, 2019 USD ($) | Dec. 31, 2018 USD ($) yr | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 04, 2018 USD ($) | Oct. 01, 2018 USD ($) | May 12, 2018 USD ($)
Secured Debt |  |  |  |  | $ 485,176 | $ 865,970 |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  | $ 13,900 | 12,300 |  |  |  |
Current Fiscal Year End Date |  |  |  |  | --12-31 |  |  |  |  |
Unsecured Debt |  |  |  |  | $ 1,836,427 | 1,338,628 |  |  |  |
Total notes payable |  |  |  |  | 2,321,600 | 2,204,600 |  |  |  |
Loss on early retirement of debt |  |  |  |  | 0 | 323 | $ 0 |  |  |
Available amount under unsecured credit facility |  |  |  |  | $ 589,900 |  |  |  |  |
Weighted average interest rate on floating rate debt |  |  |  |  | 4.20% |  |  |  |  |
Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) | yr |  |  |  |  | 4.9 |  |  |  |  |
Short-term Debt [Member] |  |  |  |  |  |  |  |  |  |
Other Short-term Borrowings |  |  |  |  | $ 0 |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  | $ 45,000
Debt Instrument, Maturity Date |  |  |  |  | May 14, 2018 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.95% |  |  |  |  |  |  |  |
Available amount under unsecured credit facility |  |  |  |  | $ 45,000 |  |  |  |  |
Letter Of Credit [Member] |  |  |  |  |  |  |  |  |  |
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility |  |  |  |  | 50,000 |  |  |  |  |
Outstanding balance under credit facility |  |  |  |  | 10,100 |  |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  | 1,736,800 | 1,338,600 |  |  |  |
Term loan Due 2022 | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 100,000 |
Unsecured Debt |  |  |  |  | 99,600 | 0 |  |  |  |
3.74% Notes Due 2028 | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.10% |  |  |  |  |  |  |  |  |
Discounted notes payable face amount | 99.893% |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 400,000 |  |  |  |  |  |  |  |  |
Notes payable, effective interest rate | 4.113% |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Basis for Effective Rate | 0.0374 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 396,100 |  |  |  |  |  |  |  |  |
3.74% Notes Due 2028 | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  | $ 396,100 | 0 |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Oct. 15, 2028 |  |  |  |  |
Notes payable, effective interest rate |  |  |  |  | 3.74% |  |  |  |  |
Secured Notes Due 2018 | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Repayments of Secured Debt | $ 380,000 |  |  |  |  |  |  |  |  |
Secured Notes 1.92% Floating Rate [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  | $ 0 | 175,000 |  | $ 175,000 |  |
Secured Notes 5.77% Floating Rate [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  | $ 205,000 |  |
Unsecured Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Value not exceeding the amount available under the unsecured credit facility |  |  |  |  | 300,000 |  |  |  |  |
Amount of current borrowing capacity under unsecured credit facility |  |  | $ 500,000 |  | 600,000 |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  | $ 900,000 |  |  |  |  |
Terms Of Bid Rate Loans |  |  |  |  | 180 |  |  |  |  |
Unsecured Credit Facility, Expiration Date |  |  | Sep. 22, 2015 |  | Aug. 07, 2019 |  |  |  |  |
Option to extend the period of unsecured credit facility |  |  |  |  | August 2020 |  |  |  |  |
Floating Rate Notes Payable [Member] |  |  |  |  |  |  |  |  |  |
Total notes payable |  |  |  |  | $ 99,600 | $ 175,000 |  |  |  |
Weighted average interest rate on floating rate debt |  |  |  |  |  | 1.90% |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Repayments of Secured Debt |  |  |  | $ 200,000 |  |  |  |  |  |

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