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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
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 | $ 15,506 | $ 14,457
Secured debt instruments - variable rate |  |
Total liabilities | 3,573,512 | 3,593,473
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 | 7 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 913,003 | 932,877
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 |  |
Derivatives - Interest rate contracts | 7 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
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 | 374,056 | 378,371
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 | 334,002 | 333,828
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 177,509 | 192,760
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 | 7 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
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 | 15,875 | 14,896
Secured debt instruments - variable rate |  |
Total liabilities | 3,671,647 | 3,721,512
Estimate of Fair Value, 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 |  |
Derivatives - Interest rate contracts | 12 | 88
Derivative Liability Designated as Hedging Instrument, Fair Value | 9,109 | 10,368
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 420,571 | 415,663
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 31,337 | 31,337
Estimate of Fair Value, 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
Estimate of Fair Value, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 592,916 | 606,623
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 249,378 | 266,196
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 | 0
Secured debt instruments - variable rate |  |
Total liabilities | 0 | 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 | 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 | 12 | 88
Secured debt instruments - variable rate |  |
Total liabilities | 9,109 | 10,368
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 | 12 | 88
Derivative Liability Designated as Hedging Instrument, Fair Value | 9,109 | 10,368
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 | 15,863 | 14,808
Secured debt instruments - variable rate |  |
Total liabilities | 3,662,538 | 3,711,144
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 | 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 | 420,571 | 415,663
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 31,337 | 31,337
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 | 592,916 | 606,623
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 249,378 | 266,196
Estimate of Fair Value, 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 | 7 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 939,488 | 967,983
Estimate of Fair Value, 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 |  |
Derivatives - Interest rate contracts | 7 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
Estimate of Fair Value, 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 | 384,909 | 391,835
Estimate of Fair Value, 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
Estimate of Fair Value, 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 | 349,634 | 355,470
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 177,509 | 192,760
Estimate of Fair Value, Fair Value Disclosure [Member] | 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 | 0
Secured debt instruments - variable rate |  |
Total liabilities | 0 | 0
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 | 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] | Fair Value, Measurements, Recurring [Member] |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 7 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 436 | 918
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 | 7 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
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] | Fair Value, Measurements, Recurring [Member] |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 0 | 0
Secured debt instruments - variable rate |  |
Total liabilities | 939,052 | 967,065
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 | 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 | 384,909 | 391,835
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 | 349,634 | 355,470
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | $ 177,509 | $ 192,760

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