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Secured debt including debt on real estate held for sale.

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Secured debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt premium.

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Gross amount of debt extinguished.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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SECURED AND UNSECURED DEBT, NET - Debt Covenants (Details) $ in Thousands	1 Months Ended			3 Months Ended
	Apr. 30, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jul. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) loan	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)
Fixed and variable rate debt
Amortization of financing costs				$ 1,000	$ 1,000
Secured Debt
Secured debt amount which encumbers real estate owned based upon book value				$ 2,100,000
Percentage of secured debt which encumbers real estate owned based upon book value				16.60%
Secured debt amount of real estate owned which is unencumbered				$ 10,700,000
Percentage of secured debt of real estate owned which is unencumbered				83.40%
Interest rate at end of the period				3.28%
Borrowings outstanding at end of period				$ 2,500		$ 2,900
Repayment of debt	$ 215,000
Unamortized net premium				$ 32,700		35,300
Weighted Average Interest Rate				3.28%
Unsecured Debt
Secured Debt
Interest rate at end of the period				3.29%
Credit facility interest rate				90
Basis points added to to variable rate				90.00%
Weighted Average Interest Rate				3.29%
Unsecured Debt \| Maximum
Secured Debt
Basis points added to to variable rate				165.00%
Unsecured Debt \| Minimum
Secured Debt
Basis points added to to variable rate				80.00%
Unsecured Working Capital Credit Facility
Secured Debt
Credit facilities with aggregate commitment				$ 75,000		75,000
Interest rate at end of the period				1.82%
Credit facility interest rate				82.5
Borrowings outstanding at end of period				$ 24,797		16,583
Weighted Average Interest Rate				1.82%
Unsecured Working Capital Credit Facility \| Maximum
Secured Debt
Basis points added to to variable rate				145.00%
Unsecured Working Capital Credit Facility \| Minimum
Secured Debt
Basis points added to to variable rate				75.00%
Unsecured Revolving credit facility due 2023
Secured Debt
Interest rate at end of the period				1.75%
Borrowings outstanding at end of period				$ 50,000
Weighted Average Interest Rate				1.75%
3.75% Medium-Term Notes Due July 2024
Secured Debt
Interest rate at end of the period				3.75%
Portion of medium term note subject to interest rate swaps				$ 100,000
Long-term Debt, Weighted Average Interest Rate				3.69%
Senior Notes				$ 299,557		299,530
Weighted Average Interest Rate				3.75%
Mortgages Note Payable \| Fixed Rate Debt
Secured Debt
Principal outstanding				$ 883,249		884,869
Interest rate at end of the period				3.61%
Weighted Average Interest Rate				3.61%
Debt Assumed As Part of Acquisition
Secured Debt
Amortization of debt discount (Premium)				$ 2,600	$ 600
Tax-exempt secured notes payable \| Variable Rate Debt
Secured Debt
Principal outstanding				$ 27,000		27,000
Interest rate at end of the period				1.91%
Weighted Average Interest Rate				1.91%
Credit facilities \| Fixed Rate Debt
Secured Debt
Principal outstanding				$ 203,429		204,590
Interest rate at end of the period				4.90%
Weighted Average Interest Rate				4.90%
Tax-exempt secured notes payable \| Variable Rate Debt
Secured Debt
Notes payable maximum interest rates range				1.91%
Revolving Credit Facility
Secured Debt
Basis points added to to variable rate				82.50%
Commitment fee				15.00%
Revolving Credit Facility \| Maximum
Secured Debt
Basis points added to to variable rate				145.00%
Commitment fee				30.00%
Revolving Credit Facility \| Minimum
Secured Debt
Basis points added to to variable rate				75.00%
Commitment fee				10.00%
4.00% Medium-Term Note due October 2025
Secured Debt
Interest rate at end of the period				4.00%
Portion of medium term note subject to interest rate swaps				$ 200,000
Senior Notes				$ 299,621		299,604
Weighted Average Interest Rate				4.00%
4.40% Medium-Term Notes due January 2029
Secured Debt
Interest rate at end of the period				4.40%
Portion of medium term note subject to interest rate swaps				$ 150,000
Long-term Debt, Weighted Average Interest Rate				4.27%
Senior Notes				$ 299,995		299,995
Weighted Average Interest Rate				4.40%
2.95% Medium-Term Note due September 2026
Secured Debt
Interest rate at end of the period				2.95%
Senior Notes				$ 300,000		300,000
Weighted Average Interest Rate				2.95%
3.20% Medium-Term Notes due January 2030
Secured Debt
Interest rate at end of the period				3.20%
Interest rate		3.20%	3.20%				3.20%
Long-term Debt, Weighted Average Interest Rate			3.42%
Senior Notes		$ 600,000		$ 613,442		402,281
Debt		$ 200,000	$ 300,000				$ 100,000
Price as percentage of principal amount		105.660
Weighted Average Interest Rate				3.20%
3.00% Medium-Term Notes due August 2031
Secured Debt
Interest rate at end of the period				3.00%
Senior Notes				$ 398,901		398,877
Weighted Average Interest Rate				3.00%
3.24% Notes due on 2030
Secured Debt
Interest rate				3.24%
Debt			$ 300,000				$ 100,000
Medium-Term Notes Due August 2031
Secured Debt
Debt				$ 150,000
Medium-Term Notes Due August 2031 \| Weighted Average
Secured Debt
Interest rate at end of the period				3.01%
Weighted Average Interest Rate				3.01%
3.10% senior unsecured notes due 2034 \| Weighted Average
Secured Debt
Interest rate at end of the period				3.13%
Weighted Average Interest Rate				3.13%
Unsecured Commercial Bank Credit Facility
Secured Debt
Credit facilities with aggregate commitment				$ 2,000,000
Repayment of debt				215,000
Unsecured Commercial Bank Credit Facility \| Unsecured Revolving credit facility due 2023
Secured Debt
Credit facilities with aggregate commitment				$ 1,100,000
Number of Extensions of loan \| loan				2
Extension period of option on loan				6 months
Unsecured Commercial Bank Credit Facility \| Revolving Credit Facility
Secured Debt
Credit facilities with aggregate commitment				$ 1,100,000		1,100,000
Borrowings outstanding at end of period				$ 50,000
United Dominion Realty L.P.
Secured Debt
Notes payable maximum interest rates range				3.28%
Interest rate at end of the period				2.83%
Weighted Average Interest Rate				2.83%
United Dominion Realty L.P. \| Fixed Rate Debt
Secured Debt
Interest rate at end of the period				3.10%
Weighted Average Interest Rate				3.10%
United Dominion Realty L.P. \| Variable Rate Debt
Secured Debt
Interest rate at end of the period				1.91%
Weighted Average Interest Rate				1.91%
United Dominion Realty L.P. \| Mortgages Note Payable
Secured Debt
Principal outstanding				$ 72,500
Interest rate				3.10%
United Dominion Realty L.P. \| Mortgages Note Payable \| Fixed Rate Debt
Secured Debt
Principal outstanding				$ 72,500		72,500
Interest rate at end of the period				3.10%
Weighted Average Interest Rate				3.10%
United Dominion Realty L.P. \| Tax-exempt secured notes payable \| Variable Rate Debt
Secured Debt
Principal outstanding				$ 27,000		27,000
Interest rate at end of the period				1.91%
Weighted Average Interest Rate				1.91%
United Dominion Realty L.P. \| Unsecured Commercial Paper
Secured Debt
Borrowings outstanding at end of period				$ 215,000		300,000
Credit facilities
Secured Debt
Principal outstanding				$ 203,400
Credit facilities \| Fixed Rate Debt
Secured Debt
Interest rate at end of the period				4.90%
Weighted Average Interest Rate				4.90%
Credit facilities \| Fair Value, Measurements, Recurring \| Carrying Amount \| Credit facilities \| Fixed Rate Debt
Secured Debt
Principal outstanding						218,490
Mortgages Note Payable \| Fixed Rate Debt \| Maximum
Secured Debt
Notes payable maximum interest rates range				4.35%
Mortgages Note Payable \| Fixed Rate Debt \| Minimum
Secured Debt
Notes payable maximum interest rates range				2.70%
Mortgages Note Payable \| Fair Value, Measurements, Recurring \| Carrying Amount \| Mortgages Note Payable \| Fixed Rate Debt
Secured Debt
Principal outstanding				$ 903,243		$ 906,228