XML 168 R63.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

SECURED AND UNSECURED DEBT, NET - Debt Covenants (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 02, 2019 USD ($) | Oct. 20, 2015 | Nov. 30, 2019 USD ($) community loan item | Oct. 30, 2019 USD ($) | Aug. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) item community | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fixed and variable rate debt |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  |  |  |  | $ 4,200 | $ 4,200 |
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 |  |  |  |  |  |  | 16.80% |  |
Secured debt amount of real estate owned which is unencumbered |  |  |  |  |  |  | $ 10,500,000 |  |
Percentage of secured debt of real estate owned which is unencumbered |  |  |  |  |  |  | 83.20% |  |
Number of Extensions of loan | item |  |  |  |  |  |  | 2 |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.43% |  |
Long term debt fair value |  |  | $ 551,800 |  |  |  |  |  |
Extension period of option on loan |  | 6 months |  |  |  |  |  |  |
Borrowings outstanding at end of period |  |  |  |  |  |  | $ 2,900 | 3,300 |
Unamortized net premium |  |  |  |  |  |  | $ 35,300 | 5,000 |
UDR/MetLife operating communities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Debt instrument, number of mortgage notes payable | item |  |  | 6 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |  |  |
Number of communities acquired | community |  |  | 10 |  |  |  | 10 |  |
Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 100.00% |  |
Commercial Paper |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  |  |  |  | 1.99% |  |
Borrowings outstanding at end of period |  |  |  |  |  |  | $ 300,000 | 101,115 |
Fixed Rate Mortgage Due October 2029 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 90,000 |  |
Interest rate at end of the period |  |  |  |  |  |  | 2.70% |  |
Mortgage Due February 2030 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 72,500 |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.10% |  |
3.20% senior unsecured notes due 2030 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 400,000 |  |  |  |  |
Interest rate at end of the period | 3.20% |  |  | 3.20% |  |  |  |  |
Senior Notes | $ 300,000 |  |  | $ 100,000 |  |  |  |  |
Percentage of notes price |  |  |  | 103.32% |  |  |  |  |
3.20% senior unsecured notes due 2030 | Treasury Lock |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  | 3.24% |  |  |  |  |
3.10% senior unsecured notes due 2034 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  | 3.10% |  |  |  |  |
Senior Notes |  |  |  | $ 300,000 |  |  |  |  |
Percentage of notes price |  |  |  | 99.56% |  |  |  |  |
3.10% senior unsecured notes due 2034 | Treasury Lock |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  | 3.13% |  |  |  |  |
4.63% Medium-Term Notes due January 2022 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  | 4.63% |  |  |  |  |
Make-whole amount |  |  |  | $ 22,000 |  |  |  |  |
Senior Notes |  |  |  | $ 400,000 |  |  |  |  |
Credit facilities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  | $ 90,000 |  |
Unsecured Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.27% |  |
Basis points added to to variable rate |  |  |  |  |  |  | 90.00% |  |
Unsecured Debt | Maximum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Basis points added to to variable rate |  |  |  |  |  |  | 1.65% |  |
Unsecured Debt | Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Basis points added to to variable rate |  |  |  |  |  |  | 0.80% |  |
Unsecured Working Capital Credit Facility due January 2021 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Credit facilities with aggregate commitment |  |  |  |  |  |  | $ 75,000 | 75,000 |
Interest rate at end of the period |  |  |  |  |  |  | 2.59% |  |
Basis points added to to variable rate |  |  |  |  |  |  | 82.50% |  |
Borrowings outstanding at end of period |  |  |  |  |  |  | $ 16,583 | 16 |
Unsecured Working Capital Credit Facility due January 2021 | Maximum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Basis points added to to variable rate |  |  |  |  |  |  | 145.00% |  |
Unsecured Working Capital Credit Facility due January 2021 | Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Basis points added to to variable rate |  |  |  |  |  |  | 75.00% |  |
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 |  |  |  |  |  |  | $ 299,530 | 299,426 |
Mortgages Notes Payable |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Long term debt fair value |  |  | $ 332,500 |  |  |  |  |  |
Debt instrument, number of mortgage notes payable | loan |  |  | 6 |  |  |  |  |  |
Mortgages Notes Payable | UDR/MetLife operating communities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |  |  |
Number of communities acquired | community |  |  | 6 |  |  |  |  |  |
Mortgages Notes Payable | Maximum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 94,100 |  |  |  |  |  |
Interest rate |  |  | 4.12% |  |  |  |  |  |
Interest rate of medium-term notes |  |  | 4.12% |  |  |  |  |  |
Mortgages Notes Payable | Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 32,600 |  |  |  |  |  |
Interest rate |  |  | 3.25% |  |  |  |  |  |
Interest rate of medium-term notes |  |  | 3.25% |  |  |  |  |  |
Mortgages Notes Payable | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 313,400 |  |  |  | $ 884,869 | 417,989 |
Interest rate at end of the period |  |  |  |  |  |  | 3.61% |  |
Mortgages Notes Payable | Fixed Rate Debt | Maximum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Notes payable maximum interest rates range |  |  |  |  |  |  | 4.35% |  |
Mortgages Notes Payable | Fixed Rate Debt | Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Notes payable maximum interest rates range |  |  |  |  |  |  | 2.70% |  |
Debt Assumed As Part of Acquisition |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Amortization of debt discount (Premium) |  |  |  |  |  |  | $ 3,000 | 3,000 | $ 3,000
Tax-exempt secured notes payable | Variable Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Notes payable maximum interest rates range |  |  |  |  |  |  | 1.79% |  |
Principal outstanding |  |  |  |  |  |  | $ 27,000 | 94,700 |
Interest rate at end of the period |  |  |  |  |  |  | 1.79% |  |
Credit facilities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 205,000 |  |  |  |  |  |
Long term debt fair value |  |  | $ 219,300 |  |  |  |  |  |
Interest rate |  |  | 4.90% |  |  |  |  |  |
Interest rate of medium-term notes |  |  | 4.90% |  |  |  |  |  |
Credit facilities | UDR/MetLife operating communities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Debt instrument, number of mortgage notes payable | community |  |  | 4 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |  |  |
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 |  |  |  |  |  |  | 1.45% |  |
Commitment fee |  |  |  |  |  |  | 0.30% |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Basis points added to to variable rate |  |  |  |  |  |  | 0.75% |  |
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 |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 4.53% |  |
Senior Notes |  |  |  |  |  |  | $ 299,604 | 299,535 |
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 | 299,994 |
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 |
3.20% Medium-Term Notes due January 2030 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.20% |  |
Interest rate |  |  |  |  |  | 3.20% |  |  |
Medium-term notes |  |  |  |  |  | $ 300,000 |  |  |
Interest rate of medium-term notes |  |  |  |  |  | 3.20% |  |  |
Percentage of principal amount at issuance |  |  |  |  |  | 99.66 |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.42% |  |  |
Senior Notes |  |  |  |  |  |  | $ 402,281 |  |
Unamortized net premium |  |  |  |  |  |  | $ 2,281 | $ 0 |
3.00% Medium-Term Notes due August 2031 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.00% |  |
Interest rate |  |  |  |  | 3.00% |  |  |  |
Medium-term notes |  |  |  |  | $ 400,000 |  |  |  |
Interest rate of medium-term notes |  |  |  |  | 3.00% |  |  |  |
Percentage of principal amount at issuance |  |  |  |  | 99.71 |  |  |  |
Senior Notes |  |  |  |  |  |  | $ 398,877 |  |
3.00% Medium-Term Notes due August 2031 | Treasury Lock |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Medium-term notes |  |  |  |  | $ 150,000 |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  | 3.01% |  |  |  |
3.70% Term Notes Due October 2020 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Interest rate at end of the period |  |  |  |  |  |  |  | 3.70% |
Interest rate |  |  |  |  | 3.70% |  |  |  |
Make-whole amount |  |  |  |  | $ 5,400 |  |  |  |
Interest rate of medium-term notes |  |  |  |  | 3.70% |  |  |  |
Redemption of debt |  |  |  |  | $ 300,000 |  |  |  |
Senior Notes |  |  |  |  |  |  |  | $ 299,986 |
Unsecured Commercial Bank Credit Facility |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Credit facilities with aggregate commitment |  |  |  |  |  |  | 2,000,000 |  |
Unsecured Commercial Bank Credit Facility | Unsecured Revolving credit facility due 2023 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Credit facilities with aggregate commitment |  |  |  |  |  |  | 1,100,000 |  |
Unsecured Commercial Bank Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Credit facilities with aggregate commitment |  |  |  |  |  |  | $ 1,100,000 | 1,100,000 |
United Dominion Realty L.P. |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Notes payable maximum interest rates range |  |  |  |  |  |  | 3.43% |  |
Principal outstanding |  |  |  |  |  |  | $ 99,071 | 26,929 |
Interest rate at end of the period |  |  |  |  |  |  | 2.78% |  |
United Dominion Realty L.P. | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 72,135 |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.10% |  |
United Dominion Realty L.P. | Commercial Paper |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Borrowings outstanding at end of period |  |  |  |  |  |  | $ 300,000 | 101,100 |
United Dominion Realty L.P. | Mortgages Notes Payable | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 72,500 |  |
Interest rate at end of the period |  |  |  |  |  |  | 3.10% |  |
Interest rate |  |  |  |  |  |  | 3.10% |  |
Interest rate of medium-term notes |  |  |  |  |  |  | 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 |  |  |  |  |  |  | 1.79% |  |
Credit facilities |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Borrowings outstanding at end of period |  |  |  |  |  |  | $ 204,590 | 90,000 |
Credit facilities | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 204,590 | 90,000 |
Interest rate at end of the period |  |  |  |  |  |  | 4.90% |  |
Credit facilities | Fair Value, Measurements, Recurring | Carrying Amount |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 218,490 |  |
Credit facilities | Fair Value, Measurements, Recurring | Carrying Amount | Fannie Mae | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  | 90,000 |
Mortgages Notes Payable | Tax-exempt secured notes payable | Variable Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Payment of notes payable |  |  |  |  |  |  | 67,700 |  |
Mortgages Notes Payable | Fair Value, Measurements, Recurring | Carrying Amount | Fixed Rate Debt |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  | $ 906,228 | $ 417,989 |

X
- Definition Represents the number of mortgage notes payable. + References No definition available. + Details
Name: | udr_DebtInstrumentNumberOfMortgageNotesPayable
Namespace Prefix: | udr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Extension period of option on loan + References No definition available. + Details
Name: | udr_ExtensionPeriodOfOptionOnLoan
Namespace Prefix: | udr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Communities Acquired + References No definition available. + Details
Name: | udr_NumberOfCommunitiesAcquired
Namespace Prefix: | udr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Extensions of loan + References No definition available. + Details
Name: | udr_NumberOfExtensionsOfLoan
Namespace Prefix: | udr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represent element information pertaining to percentage of principal amount at issuance of senior notes. + References No definition available. + Details
Name: | udr_PercentageOfPrincipalAmountAtIssuanceOfSeniorNotes
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Portion of Medium Term Note subjects to Interest Rate Swaps + References No definition available. + Details
Name: | udr_PortionOfMediumTermNoteSubjectsToInterestRateSwaps
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Price of a debt instrument as a percentage of principal amount of issuance. + References No definition available. + Details
Name: | udr_PriceOfDebtInstrumentAsPercentageOfPrincipalAmountOfIssuance
Namespace Prefix: | udr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow to repay long-term tax exempt debt that that is wholly or partially secured by collateral. + References No definition available. + Details
Name: | udr_RepaymentsOfSecuredTaxExemptDebt
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Secured Debt, Encumbers Real Estate Owned, Amount. + References No definition available. + Details
Name: | udr_SecuredDebtEncumbersRealEstateOwnedAmount
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured Debt, Encumbers Real Estate Owned, Percent. + References No definition available. + Details
Name: | udr_SecuredDebtEncumbersRealEstateOwnedPercent
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Secured debt including debt on real estate held for sale. + References No definition available. + Details
Name: | udr_SecuredDebtIncludingDebtOnRealEstateHeldForSale
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured debt. + References No definition available. + Details
Name: | udr_SecuredDebtTextualAbstract
Namespace Prefix: | udr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Secured Debt, Unencumbered Real Estate Owned, Amount. + References No definition available. + Details
Name: | udr_SecuredDebtUnencumberedRealEstateOwnedAmount
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured Debt, Unencumbered Real Estate Owned, Percent. + References No definition available. + Details
Name: | udr_SecuredDebtUnencumberedRealEstateOwnedPercent
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_AmortizationOfDebtDiscountPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of long-term debt outstanding calculated over time. + References No definition available. + Details
Name: | us-gaap_LongTermDebtWeightedAverageInterestRateOverTime
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
Name: | us-gaap_MediumTermNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_UdrMetlifeOperatingCommunitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_FixedRateMortgageDueOctober2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_MortgageDueFebruary2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_ThreePointTwoZeroPercentSeniorUnsecuredNotesDue2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_TreasuryLockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_FourPointSixThreePercentTermMediumNotesDueJanuaryTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_UnsecuredWorkingCapitalCreditFacilityDueJanuary2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A3.75MTNDueJuly2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_FixedRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_DebtAssumedAsPartOfAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TaxExemptNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_VariableRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A4.00MediumTermNoteDueOctober2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A2.95MediumTermNoteDueSeptember2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_MediumTerm3.00PercentageNoteDueAugust2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_ThreePointSevenTermNotesDueOctober2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=udr_UdrBankCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_UnsecuredRevolvingCreditFacilityDueTwoThousandTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=udr_UnitedDominionRealityLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FannieMaeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |