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Real Estate (Dispositions) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021
Real Estate [Line Items] |  |  |  |  |
Net proceeds from sales of real estate |  |  | $ 140,576 | $ 42,684 |
Impairment of assets | $ 1,179 | $ 0 | 2,965 | 6,491 |
Net Lease |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Net proceeds from sales of real estate |  |  |  | 7,500 |
Impairment of assets |  |  |  | $ 1,700 |
Operating Properties |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Real estate asset held for sale |  |  |  |  | $ 96,800
Proceeds from sale of real estate held for sale |  |  | 125,000 |  |
Gain on sale of real estate held for sale |  |  | $ 25,600 |  |

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