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Risk Management and Use of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2014
Derivatives, Fair Value [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] |
Hedge Product |  | Hedge Type |  | Designation |  | Notional Amount |  | Strike |  | Trade Date |  | Maturity Date |  | Fair value
|  |  |  |  |  | 09/30/2014 |  |  | 12/31/2013 |  |  |  |  |  |  |  |  | 09/30/2014 |  | 12/31/2013
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap |  | Interest Rate |  | Cash Flow | (a) | $ | 25,774 |  |  | $ | 25,774 |  |  | 3.300 | % |  | December 22, 2011 |  | January 30, 2021 |  | $ | 68 |  |  | $ | 549 |
Swap |  | Interest Rate |  | Cash Flow | (a) | 25,774 |  |  | 25,774 |  |  | 3.090 | % |  | January 6, 2012 |  | October 30, 2019 |  | 23 |  |  | 218 |
|  |  |  | $ | 51,548 |  |  | $ | 51,548 |  |  |  |  |  |  |  |  | $ | 91 |  |  | $ | 767 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap |  | Interest Rate |  | Cash Flow | (a) | $ | 200,000 |  |  | $ | 200,000 |  |  | 3.623 | % |  | December 6-13, 2011 |  | February 1, 2019 |  | $ | (1,243 | ) |  | $ | (545 | )
Swap |  | Interest Rate |  | Cash Flow | (a) | 27,062 |  |  | 27,062 |  |  | 2.750 | % |  | December 21, 2011 |  | September 30, 2017 |  | (181 | ) |  | (311 | )
Swap |  | Interest Rate |  | Cash Flow | (a), (b) | — |  |  | 77,000 |  |  | 2.703 | % |  | December 9-13, 2011 |  | February 1, 2016 |  | — |  |  | (887 | )
Swap |  | Interest Rate |  | Cash Flow | (a), (b) | — |  |  | 50,000 |  |  | 2.470 | % |  | December 13, 2011 |  | February 1, 2015 |  | — |  |  | (283 | )
Swap |  | Interest Rate |  | Cash Flow | (a), (b) | — |  |  | 23,000 |  |  | 2.513 | % |  | December 7-12, 2011 |  | May 1, 2015 |  | — |  |  | (162 | )
|  |  |  |  |  | $ | 227,062 |  |  | $ | 377,062 |  |  |  |  |  |  |  |  | $ | (1,424 | ) |  | $ | (2,188 | )
(a) | Hedging unsecured variable rate debt.

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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