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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Scheduled Maturities of Debt, Including Scheduled Principal Amortization (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Principal Payments |  |
October 1 through December 31, 2024 | $ 8,692,000 |
2025 | 243,243,000 |
2026 | 166,914,000 |
2027 | 131,878,000 |
2028 | 50,362,000 |
2029 | 58,541,000 |
Thereafter | 853,249,000 |
Principal amount | 1,512,879,000 | $ 1,410,000,000
Unamortized deferred debt costs | 19,997,000 | 19,300,000
Net | 1,492,882,000 |
Outstanding line of credit | 187,296,000 | $ 274,715,000
Line of Credit |  |
Principal Payments |  |
Line of credit facility, maximum borrowing capacity | 525,000,000.0 |
Unsecured Revolving Credit Facility |  |
Principal Payments |  |
Outstanding line of credit | 288,000,000.0 |
Unsecured Revolving Credit Facility | Line of Credit |  |
Principal Payments |  |
Outstanding line of credit | 188,000,000.0 |
Term Facility | Line of Credit |  |
Principal Payments |  |
Line of credit facility, maximum borrowing capacity | $ 100,000,000.0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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