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Acquisitions and Joint Ventures - Joint Ventures (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) ft² MW | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  | $ 564,664 | $ 166,143 | $ 86,159 |
Frankfurt JV |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity interest | 20.00% |  |  |  |  |  |
Proceeds from sale of assets | $ 105,000 |  | $ 93,300 |  |  |  |
Gain on sale of assets | $ 24,100 |  |  |  |  |  |
Fair value of investment |  |  | 23,300 | 23,300 |  |  |
Equity method investments |  |  | $ 26,500 | $ 26,500 |  |  |
Frankfurt JV | Forecast |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ 11,700 |  |  |  |  |
Frankfurt JV | A G C Equity Partners |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Area of real estate property | ft² | 280 |  |  |  |  |  |
Equity interest | 80.00% |  |  |  |  |  |
Power of building | MW | 27 |  |  |  |  |  |
MakeSpace JV |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity funding |  |  |  |  |  |  | $ 36,000
Equity funding capital contribution |  |  |  |  |  |  | $ 45,000
Equity interest Percentage capital contribution |  |  | 39.00% | 39.00% | 34.00% |  |
Carrying value of investment capital contribution |  |  | $ 16,924 | $ 16,924 | $ 18,570 |  |

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