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Debt of the Operating Partnership (Tables) - Digital Realty Trust, L.P. | 9 Months Ended
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Sep. 30, 2018
Debt Instrument [Line Items] |
Summary of Outstanding Indebtedness of the Operating Partnership | A summary of outstanding indebtedness of the Operating Partnership as of September 30, 2018 and December 31, 2017 is as follows (in thousands):
Indebtedness | Interest Rate at September 30, 2018 |  | Maturity Date |  | Principal Outstanding at September 30, 2018 |  | Principal Outstanding at December 31, 2017 |
Global revolving credit facility | Various | (1) | Jan 15, 2020 |  | $ | 594,983 |  | (2) | $ | 558,191 |  | (2)
Deferred financing costs, net |  |  |  |  | (4,694 | ) |  | (7,245 | ) |
Global revolving credit facility, net |  |  |  |  | 590,289 |  |  | 550,946 |  |
Unsecured Term Loans |  |  |  |  |  |  |  |
Unsecured term loan — 5-year | Various | (3)(4) | Jan 15, 2021 |  | 1,056,702 |  | (5) | 1,125,117 |  | (5)
Unsecured term loan — 7-year | Various | (3)(4) | Jan 15, 2023 |  | 300,000 |  | (5) | 300,000 |  | (5)
Deferred financing costs, net |  |  |  |  | (3,733 | ) |  | (4,784 | ) |
Unsecured term loan, net |  |  |  |  | 1,352,969 |  |  | 1,420,333 |  |
Floating rate notes due 2019 | EURIBOR + 0.500% |  | May 22, 2019 |  | 145,050 |  | (6) | 150,063 |  | (6)
5.875% notes due 2020 | 5.875% |  | Feb 1, 2020 |  | 500,000 |  |  | 500,000 |  |
3.400% notes due 2020 | 3.400% |  | Oct 1, 2020 |  | 500,000 |  |  | 500,000 |  |
5.250% notes due 2021 | 5.250% |  | Mar 15, 2021 |  | 400,000 |  |  | 400,000 |  |
3.950% notes due 2022 | 3.950% |  | Jul 1, 2022 |  | 500,000 |  |  | 500,000 |  |
3.625% notes due 2022 | 3.625% |  | Oct 1, 2022 |  | 300,000 |  |  | 300,000 |  |
2.750% notes due 2023 | 2.750% |  | Feb 1, 2023 |  | 350,000 |  |  | 350,000 |  |
4.750% notes due 2023 | 4.750% |  | Oct 13, 2023 |  | 390,930 |  | (7) | 405,390 |  | (7)
2.625% notes due 2024 | 2.625% |  | Apr 15, 2024 |  | 696,240 |  | (6) | 720,300 |  | (6)
2.750% notes due 2024 | 2.750% |  | Jul 19, 2024 |  | 325,775 |  | (7) | 337,825 |  | (7)
4.250% notes due 2025 | 4.250% |  | Jan 17, 2025 |  | 521,240 |  | (7) | 540,520 |  | (7)
4.750% notes due 2025 | 4.750% |  | Oct 1, 2025 |  | 450,000 |  |  | 450,000 |  |
3.700% notes due 2027 | 3.700% |  | Aug 15, 2027 |  | 1,000,000 |  |  | 1,000,000 |  |
4.450% notes due 2028 | 4.450% |  | Jul 15, 2028 |  | 650,000 |  |  | — |  |
3.300% notes due 2029 | 3.300% |  | Jul 19, 2029 |  | 456,085 |  | (7) | 472,955 |  | (7)
Unamortized discounts |  |  |  |  | (16,495 | ) |  | (18,508 | ) |
Total senior notes, net of discount |  |  |  |  | 7,168,825 |  |  | 6,608,545 |  |
Deferred financing costs, net |  |  |  |  | (38,284 | ) |  | (37,788 | ) |
Total unsecured senior notes, net of discount and deferred financing costs |  |  |  |  | 7,130,541 |  |  | 6,570,757 |  |
Indebtedness | Interest Rate at September 30, 2018 |  | Maturity Date |  | Principal Outstanding September 30, 2018 |  | Principal Outstanding December 31, 2017 |
Mortgage loans: |  |  |  |  |  |  |  |
731 East Trade Street | 8.22% |  | Jul 1, 2020 |  | $ | 1,930 |  |  | $ | 2,370 |  |
Secured note due 2023 | LIBOR + 1.100% | (4) | Mar 1, 2023 |  | 104,000 |  |  | 104,000 |  |
Unamortized net premiums |  |  |  |  | 171 |  |  | 241 |  |
Total mortgage loans, including premiums |  |  |  |  | 106,101 |  |  | 106,611 |  |
Deferred financing costs, net |  |  |  |  | (29 | ) |  | (29 | ) |
Total mortgage loans, including premiums and net of deferred financing costs |  |  |  |  | 106,072 |  |  | 106,582 |  |
Total indebtedness |  |  |  |  | $ | 9,179,871 |  |  | $ | 8,648,618 |  |
_________________________________
(1) | The interest rate for borrowings under the global revolving credit facility equals the applicable index plus a margin of 100 basis points, which is based on the current credit ratings of our long-term debt. An annual facility fee of 20 basis points, which is based on the credit ratings of our long-term debt, is due and payable quarterly on the total commitment amount of the facility. Two six-month extensions are available, which we may exercise if certain conditions are met.
(2) | Balances as of September 30, 2018 and December 31, 2017 are as follows (balances, in thousands):
Denomination of Draw | Balance as of September 30, 2018 |  | Weighted-average interest rate |  | Balance as of December 31, 2017 |  | Weighted-average interest rate
Floating Rate Borrowing (a) |  |  |  |  |  |  |
U.S. dollar ($) | $ | 240,000 |  |  | 3.23 | % |  | $ | 400,000 |  |  | 2.48 | %
British pound sterling (£) | — |  |  | — | % |  | 18,918 |  | (d) | 1.50 | %
Euro (€) | 74,846 |  | (c) | 0.62 | % |  | 31,213 |  | (d) | 0.62 | %
Australian dollar (AUD) | 58,659 |  | (c) | 2.85 | % |  | — |  |  | — | %
Hong Kong dollar (HKD) | 7,779 |  | (c) | 2.91 | % |  | 4,100 |  | (d) | 2.20 | %
Japanese yen (JPY) | 116,195 |  | (c) | 0.90 | % |  | 65,890 |  | (d) | 0.96 | %
Singapore dollar (SGD) | 25,114 |  | (c) | 2.61 | % |  | — |  |  | — | %
Canadian dollar (CAD) | 67,390 |  | (c) | 2.82 | % |  | 23,070 |  | (d) | 2.36 | %
Total | $ | 589,983 |  |  | 2.32 | % |  | $ | 543,191 |  |  | 2.15 | %
Base Rate Borrowing (b) |  |  |  |  |  |  |
U.S. dollar ($) | $ | 5,000 |  |  | 5.25 | % |  | $ | 15,000 |  |  | 4.50 | %
Total borrowings | $ | 594,983 |  |  | 2.35 | % |  | $ | 558,191 |  |  | 2.21 | %
(a) | The interest rates for floating rate borrowings under the global revolving credit facility equal the applicable index plus a margin of 100 basis points, which is based on the credit ratings of our long-term debt.
(b) | The interest rates for base rate borrowings under the global revolving credit facility equal the U.S. Prime Rate.
(c) | Based on exchange rates of $1.16 to €1.00, $0.72 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.73 to 1.00 SGD and $0.77 to 1.00 CAD, respectively, as of September 30, 2018.
(d) | Based on exchange rates of $1.35 to £1.00, $1.20 to €1.00, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY and $0.80 to 1.00 CAD, respectively, as of December 31, 2017.
(3) | Interest rates are based on our current senior unsecured debt ratings and are 110 basis points and 155 basis points over the applicable index for floating rate advances for the 5-Year Term Loan and the 7-Year Term Loan, respectively.
(4) | We have entered into interest rate swap agreements as a cash flow hedge for interest generated by the U.S. dollar, British pound sterling and Canadian dollar tranches of the unsecured term loans and the secured note due 2023. See Note 14 "Derivative Instruments" for further information.
(5) | Balances as of September 30, 2018 and December 31, 2017 are as follows (balances, in thousands):
Denomination of Draw | Balance as of September 30, 2018 |  | Weighted-average interest rate |  | Balance as of December 31, 2017 |  | Weighted-average interest rate |
U.S. dollar ($) | $ | 606,911 |  |  | 3.47 | % | (b) | $ | 606,911 |  |  | 2.78 | % | (d)
British pound sterling (£) | 220,843 |  | (a) | 1.82 | % | (b) | 229,011 |  | (c) | 1.59 | % | (d)
Singapore dollar (SGD) | 189,713 |  | (a) | 2.68 | % |  | 233,788 |  | (c) | 2.17 | % |
Australian dollar (AUD) | 166,369 |  | (a) | 2.94 | % |  | 179,841 |  | (c) | 2.79 | % |
Hong Kong dollar (HKD) | 85,221 |  | (a) | 2.80 | % |  | 85,762 |  | (c) | 2.20 | % |
Canadian dollar (CAD) | 76,298 |  | (a) | 2.93 | % | (b) | 78,357 |  | (c) | 2.44 | % | (d)
Japanese yen (JPY) | 11,347 |  | (a) | 1.01 | % |  | 11,447 |  | (c) | 1.05 | % |
Total | $ | 1,356,702 |  |  | 2.94 | % | (b) | $ | 1,425,117 |  |  | 2.42 | % | (d)
(a) | Based on exchange rates of $1.30 to £1.00, $0.73 to 1.00 SGD, $0.72 to 1.00 AUD, $0.13 to 1.00 HKD, $0.77 to 1.00 CAD and $0.01 to 1.00 JPY, respectively, as of September 30, 2018.
(b) | As of September 30, 2018, the weighted-average interest rate reflecting interest rate swaps was 2.72% (U.S. dollar), 1.89% (British pound sterling), 1.88% (Canadian dollar) and 2.55% (Total). See Note 14 "Derivative Instruments" for further discussion on interest rate swaps.
(c) | Based on exchange rates of $1.35 to £1.00, $0.75 to 1.00 SGD, $0.78 to 1.00 AUD,$0.13 to 1.00 HKD, $0.80 to 1.00 CAD and $0.01 to 1.00 JPY, respectively, as of December 31, 2017.
(d) | As of December 31, 2017, the weighted-average interest rate reflecting interest rate swaps was 2.72% (U.S. dollar), 1.89% (British pound sterling), 1.88% (Canadian dollar) and 2.41% (Total).
(6) | Based on exchange rates of $1.16 to €1.00 as of September 30, 2018 and $1.20 to €1.00 as of December 31, 2017.
(7) | Based on exchange rates of $1.30 to £1.00 as of September 30, 2018 and $1.35 to £1.00 as of December 31, 2017.
Schedule of Debt Maturities and Principal Maturities | The table below summarizes our debt maturities and principal payments as of September 30, 2018 (in thousands):
| Global Revolving Credit Facility(1) |  | Unsecured Term Loans |  | Unsecured Senior Notes |  | Mortgage Loans |  | Total Debt
Remainder of 2018 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 153 |  |  | $ | 153 |
2019 | — |  |  | — |  |  | 145,050 |  |  | 644 |  |  | 145,694 |
2020 | 594,983 |  |  | — |  |  | 1,000,000 |  |  | 1,133 |  |  | 1,596,116 |
2021 | — |  |  | 1,056,702 |  |  | 400,000 |  |  | — |  |  | 1,456,702 |
2022 | — |  |  | — |  |  | 800,000 |  |  | — |  |  | 800,000 |
Thereafter | — |  |  | 300,000 |  |  | 4,840,270 |  |  | 104,000 |  |  | 5,244,270 |
Subtotal | $ | 594,983 |  |  | $ | 1,356,702 |  |  | $ | 7,185,320 |  |  | $ | 105,930 |  |  | $ | 9,242,935 |
Unamortized discount | — |  |  | — |  |  | (16,495 | ) |  | — |  |  | (16,495 | )
Unamortized premium | — |  |  | — |  |  | — |  |  | 171 |  |  | 171 |
Total | $ | 594,983 |  |  | $ | 1,356,702 |  |  | $ | 7,168,825 |  |  | $ | 106,101 |  |  | $ | 9,226,611 |
(1) | Subject to two six-month extension options exercisable by us. The bank group is obligated to grant the extension options provided we give proper notice, we make certain representations and warranties and no default exists under the global revolving credit facility.

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