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Indebtedness (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Schedule of additional outstanding debt | At December 31, 2019 and 2018, our outstanding indebtedness consisted of the following:
|  |  |  | Principal Balance as of December 31,
Unsecured Floating Rate Debt (1) |  | Maturity |  | 2019 |  | 2018
Revolving credit facility (2) |  | January 2022 |  | $ | 537,500 |  |  | $ | 139,000 |
Unsecured term loan (3) |  | January 2020 |  | — |  |  | 350,000 |
Unsecured term loan |  | June 2020 |  | 250,000 |  |  | — |
Unsecured term loan |  | September 2022 |  | 200,000 |  |  | 200,000 |
Total unsecured floating rate debt |  |  |  | $ | 987,500 |  |  | $ | 689,000 |
(1) | As of December 31, 2019 and 2018, the unamortized net debt issuance costs on certain of these debts were $1,259 and $1,714, respectively.
(2) | Outstanding borrowings under our $1,000,000 unsecured revolving credit facility.
(3) | We prepaid this term loan in December 2019.
|  |  |  |  |  | December 31, 2019 |  | December 31, 2018
Senior Unsecured Notes (1) |  | Coupon |  | Maturity |  | Face Amount |  | Unamortized Discount |  | Face Amount |  | Unamortized Discount
Senior unsecured notes |  | 3.250 | % |  | May 2019 |  | $ | — |  |  | $ | — |  |  | $ | 400,000 |  |  | $ | 19 |
Senior unsecured notes |  | 6.750 | % |  | April 2020 |  | 200,000 |  |  | 59 |  |  | 200,000 |  |  | 274 |
Senior unsecured notes |  | 6.750 | % |  | December 2021 |  | 300,000 |  |  | 1,024 |  |  | 300,000 |  |  | 1,558 |
Senior unsecured notes |  | 4.750 | % |  | May 2024 |  | 250,000 |  |  | 342 |  |  | 250,000 |  |  | 421 |
Senior unsecured notes |  | 4.750 | % |  | February 2028 |  | 500,000 |  |  | 6,857 |  |  | 500,000 |  |  | 7,702 |
Senior unsecured notes |  | 5.625 | % |  | August 2042 |  | 350,000 |  |  | — |  |  | 350,000 |  |  | — |
Senior unsecured notes |  | 6.250 | % |  | February 2046 |  | 250,000 |  |  | — |  |  | 250,000 |  |  | — |
Total senior unsecured notes |  |  |  |  |  | $ | 1,850,000 |  |  | $ | 8,282 |  |  | $ | 2,250,000 |  |  | $ | 9,974 |
(1) As of December 31, 2019 and 2018, the unamortized net debt issuance costs on certain of these notes were $21,037 and $23,081, respectively.
Schedule of secured and other debt |
|  | Principal Balance as of December 31, |  |  |  |  |  | Number of Properties as Collateral |  | Net Book Value of Collateral as of December 31,
Secured and Other Debt |  | 2019 (1) |  | 2018 (1) |  | Interest Rate |  | Maturity |  | At December 31, 2019 |  | 2019 |  | 2018
Mortgage note (2) |  | $ | — |  |  | $ | 42,618 |  |  | 3.79 | % |  | July 2019 |  | — |  |  | $ | — |  |  | $ | 61,199 |
Mortgage note (3) |  | 1,426 |  |  | 2,037 |  |  | 7.49 | % |  | January 2022 |  | 1 |  |  | 11,469 |  |  | 14,602 |
Mortgage note |  | 12,513 |  |  | 13,146 |  |  | 6.28 | % |  | July 2022 |  | 1 |  |  | 23,662 |  |  | 24,064 |
Mortgage note |  | 10,958 |  |  | 11,180 |  |  | 4.85 | % |  | October 2022 |  | 1 |  |  | 20,139 |  |  | 20,602 |
Mortgage note |  | 16,131 |  |  | 16,441 |  |  | 5.75 | % |  | October 2022 |  | 2 |  |  | 19,751 |  |  | 20,342 |
Mortgage note |  | 16,056 |  |  | 16,442 |  |  | 6.64 | % |  | June 2023 |  | 1 |  |  | 22,854 |  |  | 20,538 |
Mortgage notes (4) |  | 620,000 |  |  | 620,000 |  |  | 3.53 | % |  | August 2026 |  | 1 |  |  | 724,715 |  |  | 745,079 |
Mortgage note (3) (5) |  | 1,589 |  |  | 1,983 |  |  | 6.25 | % |  | March 2026 |  | 1 |  |  | 4,226 |  |  | 4,402 |
Mortgage note |  | 10,688 |  |  | 10,901 |  |  | 4.44 | % |  | July 2043 |  | 1 |  |  | 13,756 |  |  | 13,816 |
Capital Leases |  | 8,874 |  |  | 9,832 |  |  | 7.70 | % |  | April 2026 |  | 2 |  |  | 18,432 |  |  | 17,970 |
Total secured |  | $ | 698,235 |  |  | $ | 744,580 |  |  |  |  |  |  | 11 |  |  | $ | 859,004 |  |  | $ | 942,614 |
(1) | The principal balances are the amounts stated in the contracts. In accordance with GAAP, our carrying values and recorded interest expense may be different because of market conditions at the time we assumed certain of these debts. As of December 31, 2019 and 2018, the unamortized net premiums and debt issuance costs on certain of these mortgages were $506 and $394, respectively.
(2) | We prepaid this debt in May 2019.
(3) | The properties encumbered by these mortgages were classified as held for sale as of December 31, 2019. The associated mortgages, along with $25 of unamortized net debt issuance costs, are included in liabilities of properties held for sale in our consolidated balance sheets as of December 31, 2019.
(4) | The property encumbered by these mortgages is owned in a joint venture arrangement in which we own a 55% equity interest. The principal amounts listed in the table for these debts have not been adjusted to reflect the equity interests in the joint venture that we do not own.
(5) We prepaid this debt in February 2020.
Schedule of required principal payments on outstanding debt | Required principal payments on our outstanding debt as of December 31, 2019, are as follows:
Year |  | Principal Payment |  |
2020 |  | $ | 453,799 |  |
2021 |  | 304,097 |  |
2022 |  | 776,872 |  |
2023 |  | 16,673 |  |
2024 |  | 252,110 |  |
Thereafter |  | 1,732,184 |  | (1)
(1) The carrying value of our total debt outstanding as of December 31, 2019, including unamortized debt issuance costs, premiums and discounts was $3,504,651.

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