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Secured and Unsecured Debt (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 27, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt amount which encumbers real estate owned based upon book value |  | $ 2,200,000 |  | $ 2,200,000 |  |
Percentage of secured debt which encumbers real estate owned based upon book value |  | 26.60% |  | 26.60% |  |
Secured debt amount of real estate owned which is unencumbered |  | $ 6,200,000 |  | $ 6,200,000 |  |
Percentage of secured debt of real estate owned which is unencumbered |  | 73.40% |  | 73.40% |  |
Weighted average interest rate |  | 3.58% |  |  |  |
Unamortized fair market adjustment |  | $ 5,700 |  | $ 5,700 |  | $ 6,700
Borrowings outstanding |  | 2,300 |  | $ 2,300 |  | 1,900
Extension period of option on loan |  |  |  | 6 months |  |
Line of Credit Facility, Interest Rate Description |  |  |  | 100 |  |
Line of Credit Facility, Commitment Fee Description |  |  |  | 15 |  |
Fixed Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | $ 975,024 |  | $ 975,024 |  | 969,296
Weighted average interest rate |  | 5.28% |  |  |  |
Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | $ 375,415 |  | 375,415 |  | 392,233
Weighted average interest rate |  | 1.45% |  |  |  |
3.75 MTN Due July 2024 [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Weighted average interest rate |  | 3.75% |  |  |  |
Unamortized fair market adjustment |  | $ 938 |  | $ 938 |  | 990
Debt Instrument, Maturity Date | Jul. 01, 2024 |  |  |  |  |
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Weighted average interest rate |  | 5.50% |  |  |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | Dec. 09, 2015 |  |
Debt instrument, maturity date range, end |  |  |  | May 01, 2019 |  |
Notes payable minimum interest rates range |  |  |  | 3.43% |  |
Notes payable maximum interest rates range |  |  |  | 6.16% |  |
Mortgages Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Weighted average interest rate |  | 1.94% |  |  |  |
Debt Assumed As Part of Acquisition [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  | $ 1,300 | $ 1,200 | $ 2,400 | $ 2,500 |
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Weighted average interest rate |  | 0.84% |  |  |  |
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 5.12% |  | 5.12% |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | May 01, 2017 |  |
Debt instrument, maturity date range, end |  |  |  | Jul. 01, 2023 |  |
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  | 1.63% |  | 1.63% |  |
Tax Exempt Secured Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | Aug. 01, 2019 |  |
Debt instrument, maturity date range, end |  |  |  | Mar. 20, 2032 |  |
Notes payable minimum interest rates range |  |  |  | 0.84% |  |
Notes payable maximum interest rates range |  |  |  | 0.85% |  |
Fannie Mae [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Borrowings outstanding |  | $ 815,666 |  | $ 815,666 |  | 834,282
1.67% Term Notes due December 2016 [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Weighted average interest rate |  |  |  | 1.33% |  |
Debt Instrument, Maturity Date |  |  |  | Jun. 01, 2018 |  |
UDR Bank Credit Facility [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Credit facilities with aggregate commitment |  | 900,000 |  | $ 900,000 |  | 900,000
Increment in Unsecured Revolving Credit Facility Under Certain Circumstances |  | 1,450,000 |  | 1,450,000 |  |
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | 566,288 |  | 566,288 |  | 568,086
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | 249,378 |  | 249,378 |  | 266,196
Mortgages Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Notes Payable [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | 408,736 |  | 408,736 |  | 401,210
Mortgages Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Secured Debt (Textual) [Abstract] |  |  |  |  |  |
Secured debt including debt on real estate held for sale |  | $ 31,337 |  | $ 31,337 |  | $ 31,337

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- 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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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