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Real Estate Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) a ft² propertyUnit parcel shares | Dec. 31, 2019 USD ($) ft² a propertyUnit parcel | Dec. 31, 2018 USD ($) a propertyUnit parcel
Acquisitions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² | 27,200,000 |  |
Undeveloped land suitable for future development (in acres) | a | 230 |  |
Dispositions [Abstract] |  |  |
Gains on disposition of property | $ 215,897 | $ 39,517 | $ 37,638
Impairments [Abstract] |  |  |
Impairments of real estate assets | $ 1,778 | $ 5,849 | $ 423
2020 Land Acquisitions [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of development parcels acquired (in parcels) | parcel | 2 |  |
Undeveloped land suitable for future development (in acres) | a | 1 |  |
Purchase price of acquisition | $ 8,500 |  |
Issuance of Common Units in acquisition (in units) | shares | 118,592 |  |
Submarket Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 841,000 |
Purchase price of acquisition |  | $ 399,100 |
2019 Land Acquisitions [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of development parcels acquired (in parcels) | parcel |  | 4 |
Undeveloped land suitable for future development (in acres) | a |  | 10 |
Purchase price of acquisition |  | $ 12,400 |
Nashville TN Land Acquisition (03/2018) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of development parcels acquired (in parcels) | parcel |  |  | 2
Undeveloped land suitable for future development (in acres) | a |  |  | 9
Purchase price of acquisition |  |  | $ 50,600
2020 Dispositions [Member] |  |  |
Acquisitions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² | 4,489,000 |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | propertyUnit | 52 |  |
Sale price of disposition | $ 494,200 |  |
Closing credits excluded for unfunded building and/or tenant improvements | 5,700 |  |
Gains on disposition of property | 215,500 |  |
2019 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | propertyUnit |  | 6 |
Sale price of disposition |  | $ 136,400 |
Gains on disposition of property |  | 39,500 |
2018 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | propertyUnit |  |  | 3
Sale price of disposition |  |  | $ 90,600
Gains on disposition of property |  |  | 37,600
2016 Land Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Gains on disposition of property | 400 |  |
2020 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets | $ 1,800 |  |
2019 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets |  | $ 5,800 |
2018 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets |  |  | $ 400

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