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v3.3.1.900

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Communities | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Real Estate Properties |  | 133 |  |  | 2 |
Costs Incurred to Date |  |  |  |  |  | $ 859,798
Expected Costs to Complete | [1] |  |  |  |  | 319,316
United Dominion Reality L.P. |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Development costs and capital expenditures Incurred but not yet paid |  | $ 3,118 | $ 7,254 | $ 6,371 |  |
Number of Real Estate Properties | Communities |  | 57 |  |  |  |
Ground Leases [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Real Estate Properties | Communities |  | 6 |  |  |  |
2015 |  |  |  |  |  | 5,444
2016 |  |  |  |  |  | 5,444
2017 |  |  |  |  |  | 4,486
2018 |  |  |  |  |  | 5,444
2019 |  |  |  |  |  | 5,444
Thereafter |  |  |  |  |  | 311,858
Rent expense |  | $ 5,500 | 5,400 | 5,200 |  |
Ground Leases [Member] | United Dominion Reality L.P. |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Real Estate Properties | Communities |  | 5 |  |  |  |
2015 |  |  |  |  |  | 5,400
2016 |  |  |  |  |  | 5,400
2017 |  |  |  |  |  | 4,500
2018 |  |  |  |  |  | 5,400
2019 |  |  |  |  |  | 5,400
Thereafter |  |  |  |  |  | 311,900
Rent expense |  | $ 5,400 | $ 5,300 | $ 5,100 |  |
Wholly-owned — redevelopment |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Development costs and capital expenditures Incurred but not yet paid |  | 1,200 |  |  |  |
Number of Real Estate Properties |  |  |  |  | 3 |
Costs Incurred to Date |  |  |  |  |  | 11,302
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  | 16,698
Wholly-owned — redevelopment | United Dominion Reality L.P. |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Development costs and capital expenditures Incurred but not yet paid |  | $ 700 |  |  |  |
Number of Real Estate Properties |  |  |  |  | 2 |
Costs Incurred to Date |  |  |  |  |  | 10,093
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  | $ 13,907
[1] | Represents 100% of project costs incurred to date.

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