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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Balloon Payments |  |
July 1 through December 31, 2020 | $ 0 |
2021 | 11,012 |
2022 | 211,002 |
2023 | 84,225 |
2024 | 66,164 |
2025 | 20,363 |
Thereafter | 532,910 |
Principal amount | 925,676 |
Scheduled Principal Amortization |  |
July 1 through December 31, 2020 | 14,167 |
2021 | 28,996 |
2022 | 29,609 |
2023 | 30,021 |
2024 | 29,326 |
2025 | 26,291 |
Thereafter | 99,518 |
Principal amount | 257,928 |
Total |  |
July 1 through December 31, 2020 | 14,167 |
2021 | 40,008 |
2022 | 240,611 |
2023 | 114,246 |
2024 | 95,490 |
2025 | 46,654 |
Thereafter | 632,428 |
Principal amount | 1,183,604 | $ 1,100,000
Unamortized deferred debt costs | 9,037 | 9,700
Net | 1,174,567 |
Debt Instrument [Line Items] |  |
Outstanding line of credit | 173,642 | 86,371
Unsecured Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding line of credit | $ 174,500 | $ 87,500

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