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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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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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