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Dispositions of Property (Details) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended
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Nov. 16, 2021 USD ($) property | Oct. 22, 2021 USD ($) | Sep. 23, 2021 USD ($) property | Aug. 31, 2021 USD ($) | Jun. 29, 2021 USD ($) | May 27, 2021 USD ($) property | Dec. 23, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  | $ 113,134 | $ 41,928 |
Office Properties in Atlanta, Georgia |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  | 3 |  |  |  |
Gain (loss) on sale of property |  | $ 86,800 |  |  |  | $ 22,800 |  |  |  |
Sale price |  | $ 223,900 |  |  |  | $ 219,500 |  |  |  |
Office Property in Dulles, Virginia |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  | $ (2,100) |  |  |  |  |
Sale price |  |  |  |  | $ 17,300 |  |  |  |  |
Office property in Indianapolis, Indiana |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ (1,700) |  |  |  |  |  |
Sale price |  |  |  | $ 35,000 |  |  |  |  |  |
Office properties in Chesterfield, MO |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  | 2 |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  | $ 10,300 |  |  |  |  |  |  |
Sale price |  |  | $ 67,000 |  |  |  |  |  |  |
Office property in Chantilly, VA |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 2 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property | $ (2,900) |  |  |  |  |  |  |  |  |
Sale price | $ 40,000 |  |  |  |  |  |  |  |  |
Office Property In Durham North California |  |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  | $ 41,900 |  |  |
Sale price |  |  |  |  |  |  | $ 89,700 |  |  |
Disposal group disposed of by sale, not classified as discontinued operations |  |  |  |  |  |  |  |  |  |
Operating results for discontinued operations: |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  | 38,958 | 72,967 | $ 74,626
Rental operating expenses |  |  |  |  |  |  |  | (11,518) | (20,651) | (22,867)
Real estate taxes and insurance |  |  |  |  |  |  |  | (5,654) | (11,165) | (10,851)
Depreciation and amortization |  |  |  |  |  |  |  | (11,929) | (26,552) | (26,927)
Net income (loss) from discontinued operations |  |  |  |  |  |  |  | $ 9,857 | $ 14,599 | $ 13,981

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