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Debt of the Operating Partnership (Schedule of Debt Maturities And Principal Maturities) (Details) - Digital Realty Trust, L.P. $ in Thousands | Jan. 15, 2016 extension | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Remainder of 2018 |  | $ 153 |
2019 |  | 145,694 |
2020 |  | 1,596,116 |
2021 |  | 1,456,702 |
2022 |  | 800,000 |
Thereafter |  | 5,244,270 |
Subtotal |  | 9,242,935 |
Unamortized discounts |  | (16,495) |
Unamortized premium |  | 171 |
Long-term debt, net of discount (premium) |  | 9,226,611 |
Global revolving credit facility, net |  |  |
Debt Instrument [Line Items] |  |  |
Remainder of 2018 |  | 0 |
2019 |  | 0 |
2020 |  | 594,983 |
2021 |  | 0 |
2022 |  | 0 |
Thereafter |  | 0 |
Subtotal |  | 594,983 | $ 558,191
Unamortized discounts |  | 0 |
Unamortized premium |  | 0 |
Long-term debt, net of discount (premium) |  | 594,983 |
Number of extension options | extension | 2 |  |
Revolving credit facility commitments extension | 6 months |  |
Unsecured Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Remainder of 2018 |  | 0 |
2019 |  | 0 |
2020 |  | 0 |
2021 |  | 1,056,702 |
2022 |  | 0 |
Thereafter |  | 300,000 |
Subtotal |  | 1,356,702 | 1,425,117
Unamortized discounts |  | 0 |
Unamortized premium |  | 0 |
Long-term debt, net of discount (premium) |  | 1,356,702 |
Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Remainder of 2018 |  | 0 |
2019 |  | 145,050 |
2020 |  | 1,000,000 |
2021 |  | 400,000 |
2022 |  | 800,000 |
Thereafter |  | 4,840,270 |
Subtotal |  | 7,185,320 |
Unamortized discounts |  | (16,495) | (18,508)
Unamortized premium |  | 0 |
Long-term debt, net of discount (premium) |  | 7,168,825 | 6,608,545
Mortgage Loans |  |  |
Debt Instrument [Line Items] |  |  |
Remainder of 2018 |  | 153 |
2019 |  | 644 |
2020 |  | 1,133 |
2021 |  | 0 |
2022 |  | 0 |
Thereafter |  | 104,000 |
Subtotal |  | 105,930 |
Unamortized discounts |  | 0 |
Unamortized premium |  | 171 | 241
Long-term debt, net of discount (premium) |  | $ 106,101 | $ 106,611

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