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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, 2018 | Dec. 31, 2017
--- | --- | ---
Balloon Payments |  |
July 1 through December 31, 2018 | $ 0 |
2019 | 60,793 |
2020 | 61,163 |
2021 | 11,011 |
2022 | 61,503 |
2023 | 84,225 |
Thereafter | 427,308 |
Principal amount | 706,003 |
Scheduled Principal Amortization |  |
July 1 through December 31, 2018 | 15,277 |
2019 | 29,298 |
2020 | 26,771 |
2021 | 26,486 |
2022 | 26,990 |
2023 | 27,290 |
Thereafter | 117,413 |
Principal amount | 269,525 |
Total |  |
July 1 through December 31, 2018 | 15,277 |
2019 | 90,091 |
2020 | 87,934 |
2021 | 37,497 |
2022 | 88,493 |
2023 | 111,515 |
Thereafter | 544,721 |
Principal amount | 975,528 |
Unamortized deferred debt costs | 8,648 | $ 6,900
Net | $ 966,880 |

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