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Transaction and Other Costs Transaction and Other Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 18, 2017
Transaction and other costs	$ 23,235	$ 27,706	$ 127,739
Business Acquisition, Transaction Costs	4,700
JBG Companies [Member]
Business Acquisition, Transaction Costs				$ 40,800
Investment Banking Fees Paid			33,600
Legal Fees			13,900
Professional Fees			10,800
Relocation Of Corporate Headquarters
Transaction and other costs	10,900	0	0
Demolition Costs
Transaction and other costs	5,432	0	0
Formation Transaction And Integration Costs | F1RST Residences and JBG Companies [Member]
Transaction and other costs	5,252
Formation Transaction And Integration Costs | JBG Companies [Member]
Transaction and other costs		15,907	127,739
Completed, potential and pursued transaction expenses
Transaction and other costs	651	9,008	0
Other Restructuring
Transaction and other costs	$ 1,000	$ 2,791	$ 0

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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