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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 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Balloon Payments |  |
April 1 through December 31, 2016 | $ 0 |
2017 | 14,442 |
2018 | 50,748 |
2019 | 60,794 |
2020 | 61,163 |
2021 | 11,011 |
Thereafter | 430,930 |
Principal amount | 629,088 |
Scheduled Principal Amortization |  |
April 1 through December 31, 2016 | 18,607 |
2017 | 25,768 |
2018 | 25,902 |
2019 | 24,614 |
2020 | 21,892 |
2021 | 21,405 |
Thereafter | 106,296 |
Principal amount | 244,484 |
Total |  |
April 1 through December 31, 2016 | 18,607 |
2017 | 40,210 |
2018 | 76,650 |
2019 | 85,408 |
2020 | 83,055 |
2021 | 32,416 |
Thereafter | 537,226 |
Principal amount | 873,572 |
Unamortized deferred debt costs | 8,381 | $ 8,700
Net | 865,191 |
Debt Instrument [Line Items] |  |
Outstanding line of credit | 21,825 | 26,695
Unsecured Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding line of credit | $ 23,000 | $ 28,000

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