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Real Estate - Dispositions of Real Estate (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Dec. 20, 2023 | Dec. 15, 2023 | Aug. 16, 2023 | Jun. 30, 2023 | Jun. 08, 2023 | May 15, 2023 | May 09, 2023 | Mar. 02, 2023 | Feb. 16, 2023 | Jan. 06, 2023 | Dec. 27, 2022 | Aug. 26, 2022 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  |  |  |  | $ 170,400 | $ 1,100,000 | $ 27,225 | $ 8,300 | $ 130,800 | $ 169,600 | $ 335,925
Gain (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,507 | $ 3,748 | $ (9,701) | $ 30,610 | $ 29,164
Irvine, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  |  |  | $ 40,000 |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  |  |  |  | $ 18,690 |  |  |  |  |  |  |
Clinton, SC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  |  | $ 19,300 |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  |  |  | $ 7,109 |  |  |  |  |  |  |  |
Herndon, VA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  |  | $ 110,300 |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  |  | $ 4,811 |  |  |  |  |  |  |  |  |
Lone Tree, CO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  | $ (275) |  |  |  |  |  |  |  |  |  |
Houston, TX |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  | $ 5,825 |  |  |  | $ 62,300 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  | $ 2,014 |  |  |  | $ (5,024) |  |  |  |  |  |  |  |  |  |  |
Greenwood Village, CO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  | $ (5,228) |  |  |  |  |  |  |  |  |  |  |  |
Andover, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  | $ 23,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  | 122 |  |  |  |  |  |  |  |  |  |  |  |  |
Andover, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  | 34,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  | $ 704 |  |  |  |  |  |  |  |  |  |  |  |  |
Rancho Cordova, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  | $ 8,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  | $ 3,748 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tyler, TX |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds | $ 21,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) | 2,493 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination fee received | $ 21,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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