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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, 2017 | Dec. 31, 2016
--- | --- | ---
Balloon Payments |  |
October 1 through December 31, 2017 | $ 0 |
2018 | 130,799 |
2019 | 60,793 |
2020 | 61,163 |
2021 | 11,012 |
2022 | 36,502 |
Thereafter | 405,693 |
Principal amount | 705,962 |
Scheduled Principal Amortization |  |
October 1 through December 31, 2017 | 7,386 |
2018 | 29,015 |
2019 | 27,769 |
2020 | 25,182 |
2021 | 24,836 |
2022 | 25,277 |
Thereafter | 123,478 |
Principal amount | 262,943 |
Total |  |
October 1 through December 31, 2017 | 7,386 |
2018 | 159,814 |
2019 | 88,562 |
2020 | 86,345 |
2021 | 35,848 |
2022 | 61,779 |
Thereafter | 529,171 |
Principal amount | 968,905 |
Unamortized deferred debt costs | 6,759 | $ 7,500
Net | $ 962,146 |

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