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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Scheduled Maturities of Debt, Including Scheduled Principal Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Balloon Payments |  |
October 1 through December 31, 2020 | $ 0 |
2021 | 11,012 |
2022 | 161,002 |
2023 | 84,225 |
2024 | 66,164 |
2025 | 20,363 |
Thereafter | 566,375 |
Principal amount | 909,141 |
Scheduled Principal Amortization |  |
October 1 through December 31, 2020 | 7,453 |
2021 | 30,323 |
2021 | 30,984 |
2022 | 31,447 |
2023 | 30,815 |
2024 | 27,823 |
Thereafter | 117,532 |
Principal amount | 276,377 |
Total |  |
October 1 through December 31, 2020 | 7,453 |
2021 | 41,335 |
2022 | 191,986 |
2023 | 115,672 |
2024 | 96,979 |
2025 | 48,186 |
Thereafter | 683,907 |
Principal amount | 1,185,518 | $ 1,100,000
Unamortized deferred debt costs | 9,735 | 9,700
Net | 1,175,783 |
Debt Instrument [Line Items] |  |
Outstanding line of credit | 123,778 | 86,371
Unsecured Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding line of credit | $ 124,500 | $ 87,500

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