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The Combination Fair Value of Common Shares And OP Unit Purchase Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 18, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 17, 2017
Common Stock, Shares, Outstanding |  | 134,148 | 120,937 |
Business Combination, Contingent Consideration, Liability | $ (110,600) |  |  |
JBG Companies [Member] |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 100,571
Business Acquisition, Equity Interest Issued or Issuable, Exchange Ratio | 271.00% |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 37,164 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 1,378,780 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Fair Value Adjustment to OP Units Issued | (43,304) |  |  |
Business Combination, Contingent Consideration, Liability | (110,591) |  |  |
Common shares and OP Units | $ 1,224,885 |  |  |
Formation Awards |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Per Share |  |  | $ 34.40 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 10 years |  |
Formation Awards | JBG Companies [Member] |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Per Share | $ 37.10 |  |  |
OP Units [Member] | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 12 months |  |  |
OP Units [Member] | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 60 months |  |  |

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