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Debt of the Operating Partnership (Summary of Outstanding Indebtedness) (Details)
$ in Thousands
6 Months Ended
Jan. 15, 2016
extension
Jun. 30, 2018
USD ($)
$ / €
$ / £
Jun. 21, 2018
Dec. 31, 2017
USD ($)
$ / €
$ / £
3.950% notes due 2022        
Debt Instrument [Line Items]        
Stated interest rate   3.95%    
3.625% notes due 2022        
Debt Instrument [Line Items]        
Stated interest rate   3.625%    
2.625% notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate   2.625%    
2.750% notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate   2.75%    
4.750% notes due 2025        
Debt Instrument [Line Items]        
Stated interest rate   4.75%    
Global revolving credit facility        
Debt Instrument [Line Items]        
Deferred financing costs   $ (5,500)   $ (7,200)
Unsecured Term Loans        
Debt Instrument [Line Items]        
Deferred financing costs   (4,100)   (4,800)
Unsecured Senior Notes        
Debt Instrument [Line Items]        
Deferred financing costs   $ (40,400)   (37,800)
Unsecured Senior Notes | 5.875% notes due 2020        
Debt Instrument [Line Items]        
Stated interest rate   5.875%    
Unsecured Senior Notes | 5.250% notes due 2021        
Debt Instrument [Line Items]        
Stated interest rate   5.25%    
Unsecured Senior Notes | 3.950% notes due 2022        
Debt Instrument [Line Items]        
Stated interest rate   3.95%    
Unsecured Senior Notes | 3.625% notes due 2022        
Debt Instrument [Line Items]        
Stated interest rate   3.625%    
Unsecured Senior Notes | 2.750% notes due 2023        
Debt Instrument [Line Items]        
Stated interest rate   2.75%    
Unsecured Senior Notes | 4.750% notes due 2023        
Debt Instrument [Line Items]        
Stated interest rate   4.75%    
Unsecured Senior Notes | 2.625% notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate   2.625%    
Unsecured Senior Notes | 2.750% notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate   2.75%    
Unsecured Senior Notes | 4.250% notes due 2025        
Debt Instrument [Line Items]        
Stated interest rate   4.25%    
Unsecured Senior Notes | 4.750% notes due 2025        
Debt Instrument [Line Items]        
Stated interest rate   4.75%    
Unsecured Senior Notes | 3.700% notes due 2027        
Debt Instrument [Line Items]        
Stated interest rate   3.70%    
Unsecured Senior Notes | 4.450% notes due 2028        
Debt Instrument [Line Items]        
Stated interest rate   4.45%    
Unsecured Senior Notes | 3.300% notes due 2029        
Debt Instrument [Line Items]        
Stated interest rate   3.30%    
Mortgage Loans        
Debt Instrument [Line Items]        
Deferred financing costs   $ 0   0
Digital Realty Trust, L.P.        
Debt Instrument [Line Items]        
Long-term debt, gross   9,173,385    
Total indebtedness   9,106,084   8,648,618
Unamortized discounts   (17,509)    
Unamortized net premiums   194    
Long-term debt, net of discount (premium)   $ 9,156,070    
Digital Realty Trust, L.P. | Unsecured term loan — 5-year        
Debt Instrument [Line Items]        
Interest rate basis spread   1.10%    
Debt instrument term 5 years      
Digital Realty Trust, L.P. | Unsecured term loan — 7-year        
Debt Instrument [Line Items]        
Interest rate basis spread   1.55%    
Debt instrument term 7 years      
Digital Realty Trust, L.P. | Global revolving credit facility        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 472,438   558,191
Deferred financing costs   (5,467)   (7,245)
Total indebtedness   466,971   $ 550,946
Unamortized discounts   0    
Unamortized net premiums   0    
Long-term debt, net of discount (premium)   $ 472,438    
Commitment fee percentage   0.20%    
Number of extension options | extension 2      
Debt instrument, extension term 6 months      
Interest rate basis spread   1.00%    
Digital Realty Trust, L.P. | Global revolving credit facility | British pound sterling (£)        
Debt Instrument [Line Items]        
Exchange rate | $ / £       1.35
Digital Realty Trust, L.P. | Global revolving credit facility | Euro (€)        
Debt Instrument [Line Items]        
Exchange rate | $ / €   1.17   1.20
Digital Realty Trust, L.P. | Unsecured Term Loans        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 1,380,867   $ 1,425,117
Deferred financing costs   (4,083)   (4,784)
Total indebtedness   1,376,784   1,420,333
Unamortized discounts   0    
Unamortized net premiums   0    
Long-term debt, net of discount (premium)   1,380,867    
Digital Realty Trust, L.P. | Unsecured Term Loans | British pound sterling (£)        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 223,825   $ 229,011
Exchange rate | $ / £   1.32   1.35
Digital Realty Trust, L.P. | Unsecured Term Loans | Euro (€)        
Debt Instrument [Line Items]        
Exchange rate | $ / €   1.17   1.20
Digital Realty Trust, L.P. | Unsecured Term Loans | Unsecured term loan — 5-year        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 1,080,867   $ 1,125,117
Interest rate basis spread   1.10%    
Debt instrument term   5 years    
Digital Realty Trust, L.P. | Unsecured Term Loans | Unsecured term loan — 7-year        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 300,000   300,000
Interest rate basis spread   1.55%    
Debt instrument term   7 years    
Digital Realty Trust, L.P. | Unsecured Senior Notes        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 7,214,000    
Deferred financing costs   (40,407)   (37,788)
Total indebtedness   7,156,084   6,570,757
Unamortized discounts   (17,509)   (18,508)
Unamortized net premiums   0    
Long-term debt, net of discount (premium)   7,196,491   6,608,545
Digital Realty Trust, L.P. | Unsecured Senior Notes | Floating rate notes due 2019        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 146,050   150,063
Digital Realty Trust, L.P. | Unsecured Senior Notes | Floating rate notes due 2019 | EURIBOR        
Debt Instrument [Line Items]        
Interest rate basis spread   0.50%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 5.875% notes due 2020        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 500,000   500,000
Stated interest rate   5.875%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.400% notes due 2020        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 500,000   500,000
Stated interest rate   3.40%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 5.250% notes due 2021        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 400,000   400,000
Stated interest rate   5.25%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.950% notes due 2022        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 500,000   500,000
Stated interest rate   3.95%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.625% notes due 2022        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 300,000   300,000
Stated interest rate   3.625%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.750% notes due 2023        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 350,000   350,000
Stated interest rate   2.75%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.750% notes due 2023        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 396,210   405,390
Stated interest rate   4.75%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.625% notes due 2024        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 701,040   720,300
Stated interest rate   2.625%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.750% notes due 2024        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 330,175   337,825
Stated interest rate   2.75%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.250% notes due 2025        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 528,280   540,520
Stated interest rate   4.25%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.750% notes due 2025        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 450,000   450,000
Stated interest rate   4.75%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.700% notes due 2027        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 1,000,000   1,000,000
Stated interest rate   3.70%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.450% notes due 2028        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 650,000   0
Stated interest rate   4.45% 4.45%  
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.300% notes due 2029        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 462,245   472,955
Stated interest rate   3.30%    
Digital Realty Trust, L.P. | Unsecured Senior Notes | Secured note due 2023 | LIBOR        
Debt Instrument [Line Items]        
Interest rate basis spread   1.10%    
Digital Realty Trust, L.P. | Mortgage Loans        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 106,080    
Deferred financing costs   (29)   (29)
Total indebtedness   106,245   106,582
Unamortized discounts   0    
Unamortized net premiums   194   241
Long-term debt, net of discount (premium)   106,274   106,611
Digital Realty Trust, L.P. | Mortgage Loans | 731 East Trade Street        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 2,080   2,370
Effective interest rate (as a percent)   8.22%    
Digital Realty Trust, L.P. | Mortgage Loans | Secured note due 2023        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 104,000   $ 104,000