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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Carrying Amount | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | $ 16,707 | $ 14,457
Secured debt instruments - variable rate |  |
Total liabilities | 3,590,829 | 3,593,473
Fair Value | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 16,951 | 14,896
Secured debt instruments - variable rate |  |
Total liabilities | 3,673,283 | 3,721,512
Fair Value | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 13 | 88
Derivatives - Interest rate contracts | 2,112 | 10,368
Fair Value | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 448,019 | 415,663
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 31,337 | 31,337
Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 94,700 | 94,700
Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 539,050 | 606,623
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 299,378 | 266,196
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value, Measurements, Recurring |  |
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
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivatives - Interest rate contracts | 0 | 0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 13 | 88
Secured debt instruments - variable rate |  |
Total liabilities | 2,112 | 10,368
Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 13 | 88
Derivatives - Interest rate contracts | 2,112 | 10,368
Fair Value | Significant Other Observable Inputs (Level 2) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Significant Other Observable Inputs (Level 2) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Significant Other Observable Inputs (Level 2) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 16,938 | 14,808
Secured debt instruments - variable rate |  |
Total liabilities | 3,671,171 | 3,711,144
Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivatives - Interest rate contracts | 0 | 0
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 448,019 | 415,663
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 31,337 | 31,337
Fair Value | Significant Unobservable Inputs (Level 3) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 94,700 | 94,700
Fair Value | Significant Unobservable Inputs (Level 3) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 539,050 | 606,623
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 299,378 | 266,196
United Dominion Reality L.P. |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 39
Derivatives - Interest rate contracts | 0 | 918
United Dominion Reality L.P. | Carrying Amount | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 8 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 478,163 | 932,877
United Dominion Reality L.P. | Carrying Amount | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 39
Derivatives - Interest rate contracts |  | 918
United Dominion Reality L.P. | Carrying Amount | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 30,132 | 378,371
United Dominion Reality L.P. | Carrying Amount | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 27,000 | 27,000
United Dominion Reality L.P. | Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 250,828 | 333,828
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 170,203 | 192,760
United Dominion Reality L.P. | Fair Value | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 8 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 490,581 | 967,983
United Dominion Reality L.P. | Fair Value | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 39
Derivatives - Interest rate contracts |  | 918
United Dominion Reality L.P. | Fair Value | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 30,308 | 391,835
United Dominion Reality L.P. | Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 27,000 | 27,000
United Dominion Reality L.P. | Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 263,070 | 355,470
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 170,203 | 192,760
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value, Measurements, Recurring |  |
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
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivatives - Interest rate contracts |  | 0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Total assets | 8 | 39
Secured debt instruments - variable rate |  |
Total liabilities | 0 | 918
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 39
Derivatives - Interest rate contracts |  | 918
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 0 | 0
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 0 | 0
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
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 | 490,581 | 967,065
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate contracts | Fair Value, Measurements, Recurring |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivatives - Interest rate contracts |  | 0
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Mortgages [Member] | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 30,308 | 391,835
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring |  |
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | 27,000 | 27,000
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring |  |
Secured debt instruments - fixed rate |  |
Secured debt instruments - fixed rate | 263,070 | 355,470
Secured debt instruments - variable rate |  |
Secured debt instruments - variable rate | $ 170,203 | $ 192,760

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