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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | $ 299 |  | $ 0 |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,382 |  | 4,965 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 19,157 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 3,742,913 |  | 3,651,141 |
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 299 | [1] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,382 | [1] | 4,965 | [1]
Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 451,582 | [2] | 466,375 | [2]
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 31,337 | [2] | 63,595 | [2]
Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 94,700 | [2] | 94,700 | [2]
Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 655,035 | [2] | 661,094 | [2]
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 211,409 | [2] | 211,409 | [2]
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 0 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 0 |  | 0 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 299 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 2,382 |  | 4,965 |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 18,858 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 3,740,531 |  | 3,646,176 |
United Dominion Reality L.P. [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 5 |  | 0 |
Derivative Liability Designated as Hedging Instrument, Fair Value | 1,324 |  | 2,731 |
United Dominion Reality L.P. [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 5 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 958,115 |  | 969,724 |
United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 5 | [3] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 1,324 | [3] | 2,731 | [3]
United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 392,883 | [4] | 403,695 | [4]
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 27,000 | [4] | 27,000 | [4]
United Dominion Reality L.P. [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 394,849 | [4] | 394,239 | [4]
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 142,059 | [4] | 142,059 | [4]
United Dominion Reality L.P. [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 0 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 0 |  | 0 |
United Dominion Reality L.P. [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 5 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 1,324 |  | 2,731 |
United Dominion Reality L.P. [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 0 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 956,791 |  | 966,993 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets |  |  | 83,833 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets |  |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 0 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets |  |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 299 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,382 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets |  |  | 83,833 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 0 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 451,582 |  | 466,375 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 31,337 |  | 63,595 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 94,700 |  | 94,700 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 655,035 |  | 661,094 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 211,409 |  | 211,409 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 0 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 5 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 1,324 |  | 2,731 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 0 |  | 0 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivatives - Interest rate contracts | 0 |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 392,883 |  | 403,695 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 27,000 |  | 27,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 394,849 |  | 394,239 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 142,059 |  | 142,059 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 18,617 |  | 83,033 |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 3,630,574 |  | 3,528,668 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,382 |  | 4,965 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 438,172 |  | 445,706 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 31,337 |  | 63,595 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 94,700 |  | 94,700 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 623,754 |  | 626,667 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 211,409 |  | 211,409 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Total assets | 5 |  |  |
Secured debt instruments - variable rate |  |  |  |
Total liabilities | 929,598 |  | 937,596 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 1,324 |  | 2,731 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 380,506 |  | 386,803 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | 27,000 |  | 27,000 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Secured debt instruments - fixed rate |  |  |  |
Secured debt instruments - fixed rate | 378,709 |  | 379,003 |
Secured debt instruments - variable rate |  |  |  |
Secured debt instruments - variable rate | $ 142,059 |  | $ 142,059 |
[1] | See Note 6, Secured and Unsecured Debt
[2] | See Note 2, Significant Accounting Policies
[3] | See Note 5, Debt
[4] | See Note 8, Derivatives and Hedging Activity

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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