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Notes Payable (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) yr | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | $ 19,600 | $ 23,400 |
Unsecured Debt |  | 3,170,367 | 3,166,625 |
Total notes payable | [1] | 3,170,400 | 3,166,600 |
Loss on early retirement of debt |  | 0 | 176 | $ 11,995
Available amount under unsecured credit facility |  | $ 885,200 |  |
Weighted average interest rate on floating rate debt | [2] | 3.60% |  |
Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) | yr |  | 7.4 |  |
Letter Of Credit [Member] |  |  |  |
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility |  | $ 50,000 |  |
Outstanding balance under credit facility |  | 14,800 |  |
Commercial Banks [Member] | Unsecured Credit Facility [Member] |  |  |  |
Unsecured Debt |  | 0 |  |
Senior Unsecured Notes [Member] |  |  |  |
Unsecured Debt |  | 3,130,500 | 3,126,900 |
Unsecured Credit Facility [Member] |  |  |  |
Value not exceeding the amount available under the unsecured credit facility |  | 450,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 900,000 |  |
Terms Of Bid Rate Loans |  | 180 days |  |
Floating Rate Notes Payable [Member] |  |  |  |
Total notes payable |  | $ 39,900 | $ 39,700 |
Weighted average interest rate on floating rate debt |  | 1.90% | 1.90% |
[1] | Unamortized debt discounts and debt issuance costs of $19.6 million and $23.4 million are included in senior unsecured notes payable as of December 31, 2021 and 2020, respectively.
[2] | Includes the effects of the applicable settled forward interest rate swaps.

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- Definition Maximum term of bid rate loans in days related to the line of credit. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates + References No definition available. + Details
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- Definition Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. + References No definition available. + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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